Math games

These games require the Microsoft VB6 runtimes to be installed beforehand.

A2Bflip

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version 1.0
Updated 20 November 2007

A2Bflip, derived from Japanese puzzle game Masyu, is played on a grid of squares, some of which contain 'mirrors'. The goal is to connect circles A and B:

Go from A to B with a single continuous line
Must use all mirrors
Line turns right angle at a mirror
Cannot use a mirror twice
Cannot pass through a cell twice
Cannot turn in any cell without a mirror
To navigate:
- Click A to set the start direction
- Click a mirror to flip direction
Features:
- Create new puzzles automatically with different grid sizes from 5x5 to 20x20
- Solve existing puzzles interactively or on paper
- Print puzzles and solutions
- 20,000 puzzles with solutions are provided

Download Puzzles

Cardoku V1

Download v1
Updated 25 June 2007

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20,000 puzzles of different difficulty levels

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Cardoku is a Sudoku look alike with some subtle differences. This puzzle has following rules:

A puzzle has a 7x7 grid and a 52-card deck. A puzzle and its solution use only 49 cards.
Some cards are already placed on the grid as part of the puzzle. The remaining cards are stacked for use.
You are required to place all the remaining cards on the grid, given the following rules:
- No duplicate numbers in any row or a column
- A cell cannot have a card suite of the neighboring cells. Neighboring cells are Up,Down,Left and Right.
- A cell cannot have neighboring numbers of the neighboring cells. Neighboring numbers are +1 and -1 of a number. For example neighboring numbers of 5 would be 4 and 6; neighboring numbers of 1 will be 2 and K, and neighbors of K will be 1 and Q.
- Consider:
  5C
  3D ? 1H
  KD
  Cell in the centre has to be a Spade, and its value cannot be 2,4, 4,6, 2,K, and 1,Q. Also 3,5,1,K cannot be placed being in the same row and column. Therefore this cell cannot have 1,2,3,4,5,6,Q,K. In this case if only 7 is left in the remaining spades, then 7S must be placed in this cell.

This puzzle requires mathematical as well as visual skills. Even simple puzzles can be rather difficult to solve. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different difficulty levels
Solve existing puzzles manually
Create new puzzles interactively or in bulk
Save puzzles as Ascii or bitmap files
Print puzzles and solutions
20,000 puzzles with varying levels of difficulty and solutions are provided. Download

Circolar

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version 1.0
Updated 31 March 2008

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Rotate three rings to align three segments of same colours. Each ring has eight segments. Three colours are distrubuted randomly in each segement with some colours duplicated. As you rotate a ring left or right, all colours in it rotate accordingly. You are required to get three segments, each of a different colour aligned correctly. With careful thinking any random puzzle can be solved in three to four rotations. Note that a solution must have three segments of three different colours.

How to Play

Left click on a ring to rotate all colours in the ring clockwise
Right click on a ring to rotate all colours in the ring anti-clockwise

Connect

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Version 1.0
Updated 12 June 2008

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Connect is a varaiation of the Number Link puzzle (by Nikoli - 2006).
The player has to connect a node (a circle) with a number using as many cells as the number. Count of cells used includes the circle and the number as well. The lines cannot branch off or cross over each other, and the numbers have to fall at one end and the circle at the other. All cells must be filled with line and there is only one unique solution for a puzzle. 20,000 Puzzles provided with this program have unique solutions. Program handles puzzle size 5x5 to 16x16.

Generally Connect puzzles are rather easy to solve - size 8x8 and below in particular. Nevertheless they are good fun to try. This program will generate puzzles that have unique solutions. Caution - puzzle size 12x12 and above may take some time to generate.

How to Play

Normally you would print a puzzle and solve it on paper at your leisure. You can also connect numbers on screen using the following commands:

Leftclick mouse on a cell and drag mouse to the new location
Release leftclick to draw a line
A line can only be vertical or horizontal
Can draw a line in many horizontal and vertical segments if necessary
Cannot cross lines
Cannot draw a line through a number or a circle
Must connect one number with one circle only
Each puzzle has a unique solution

Program Options

Select line, number and circle colours of your choice
Use circle or a rectangle as a node
Save and reload puzzles
Print puzzles and their solutions
Use one of 20,000 puzzles or let program create one at random
Set display colour schemes
20,000 puzzles with solutions Download
Set display colour schemes

FutoShiki V2

Download v2
Updated 14 December 2006

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25,000 puzzles of size 3x3 to 9x9

Help

FutoShiki puzzle is normally played on a 5x5 grid. The objective is to place the numbers 1 to 5 in each row, ensuring that each column also only contains the digits 1 to 5. Some digits are given at the start. In addition, constraints are also specified between some of the squares, such that one number is higher or lower than its neighbor. These constraints must be met as the grid is filled out.

Create new puzzles manually or automatically. Automatic creation offers unique puzzle each time with different levels of difficulty.
Solve existing puzzles manually or let program solve it.
Save puzzles
Print puzzles and solutions

New in Version 2:

Puzzle size 3x3 to 9x9
Different levels of difficulty

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Hashiwokakero

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version 1.0
Updated 7th March 2007

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Hashiwokakero is played on a rectangular grid with no standard size, although the grid itself is not usually drawn. Some cells start out with (usually encircled) numbers from 1 to 8 inclusive; these are the islands. The rest of the cells are empty. The goal is to connect all of the islands into a single connected group by drawing a series of bridges between the islands. The bridges must follow the criteria below:

They must begin and end at distinct islands, traveling in a straight line in between
They must not cross any other bridges or islands
They may only up/down or across
At most two bridges connect a pair of islands
The number of bridges connected to each island must match the number on that island

Solving a Hashiwokakero puzzle is a matter of procedural force: having determined where a bridge must be placed, placing it there can eliminate other possible places for bridges, forcing the placement of another bridge, and so on.

This program helps you solve existing Hashiwokakero puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different grid sizes from 7x7 to 25x25
Solve existing puzzles manually or let program solve it
Save puzzles as bitmap files
Print puzzles and solutions
Display options include: circular or square islands, island size and display color schemes
Puzzle size limitation of 7x7 to a maximum 25 rows and 25 columns
20,000 puzzles with varying levels of difficulty and solutions are provided. Download

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Heyawake

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version 1.0
Updated 21 August 2006

Download 20,000 puzzles

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This program helps you solve existing Heyawake puzzles as well as create new ones. Heyawake is another Japanese number puzzle (yes another one). Heyawake is played on a rectangular grid of cells with no standard size; the grid is divided into variously sized rectangular "rooms" by bold lines following the edges of the cells. Some rooms may contain a single number, typically printed in their upper-left cell; as originally designed, every room was numbered, but this is rarely necessary for solving and is no longer followed. Some of the cells in the puzzle are to be painted black; the object of the puzzle is to determine for each cell if it must be painted or must be left blank (remaining white). Main features of this program are: In this program you can:

Create new puzzles manually or automatically. Automatic creation offers unique puzzle each time with different levels of difficulty. This program has a puzzle size limitation of maximum 16 rows and 16 columns.
Solve existing puzzles manually or let program solve it.
Save puzzles
Print puzzles and solutions

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Hitori

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version 1.0
Updated 1 February 2006

Download 20,000 puzzles

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This programs solves existing Hitori puzzles as well as creates new ones. Hitori is mathematical game where a square grid is filled with numbers. Some numbers in a row or a column are duplicated. The object of the game is to locate these duplicates and mark them blank, given the following three rules:

Numbers may never appear more than once in each row or column
Black cells are never adjacent in a row or a column
Empty cells create a single continuous area, undivided by black cells

This program has a puzzle size limitation of maximum 17 rows and 17 columns.

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Kakuro

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version 1.0
Updated 7 Janurary 2006

Download 20,000 puzzles

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This programs helps you solve existing KaKuRo puzzles as well as create new ones. KaKuRo (or Cross Sums) is a puzzle that is solved much like a crossword puzzle, using digits instead of letters. Where an entry in a regular crossword may form a word, the digits in a Cross Sums entry add up to a sum. The sums, or clues, are embedded in a shaded square of the puzzle. The top right number is the across sum while the bottom right number is a down sum. Only the digits 1 through 9 are used and no digit may appear more than once in any sum. The object of the puzzle is to insert a digit from 1 to 9 inclusive into each non-shaded cell such that the sum of the numbers in each entry matches the sum associated with it and that no digit is duplicated in any entry.

Main features of this program are:

Manually solve existing Puzzles
Auto Solve existing puzzles
Create and save new Puzzles
Compile new Puzzles from existing layouts
Print single or multiple puzzles

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Liteit

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version 1.0
Updated 1 March 2006

Download 20,000 puzzles

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This programs helps you solve existing LiteIt puzzles as well as create new ones. LiteIt consists of a grid comprising empty cells, black cells, and cells with numbers 0 to 4. Challenge is to:

Illuminate all the empty cells by placing -light bulbs- at empty locations
A bulb placed at a cell will light up all the cells in its row and column
No two bulbs must face each other
A numbered cell must have exact number of bulbs around the cell, eg a cell with number 1 must have one and only bulb around it etc. Cell with number 0 cannot have any bulb around it

Sounds simple but hard to figure out. Keep learning and have fun. This program has a puzzle size limitation of maximum 20 rows and 24 columns.

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Make9

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version 1.0
Updated 24 July 2008

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Introduction
This is a popular game with younger children traveling in a car. You pickup number plate of a car passing by, take first six numbers and add, subtract these to get a total of 9. This program simulates that game. A good exercise in mental maths.

How to Play

Click Next to start a new game
Six digits will then be given for you to make number 9 using the following rules:
- Left click on a number to be used in a calculation
- Click on + and - sign to select addition or subtraction, result will be calculated and displayed
- Right click on a number to undo its inclusion in a calculation
- Must use each number once and once only
- Can only add or subtract numbers, no multiplications or divisions
- Cannot have zero or negative numbers as answers
- Can use an intermediate result in calculations
- There could be several solutions to a puzzle
Scoring is based on the number of puzzles solved within a time limit of three minutes

Magicsquare

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version 1.0
Updated 21 July 2004

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A magic square is an arrangement of the numbers from 1 to n^2 (n-squared) in an nxn matrix, with each number occurring exactly once, and such that the sum of the entries of any row, any column, or any main diagonal is the same. It is not hard to show that this sum must be n(n^2+1)/2.

Sometimes the magic squares above are called 'normal' squares, where cells are filled with numbers 1 to n for a grid of size n. Another set of magic squares is where a cell may be filled with any number, with the sum of rows, columns and diagonals being a pre-selected number.

This program computes 'normal' as well as the 'variable' types of magic squares. Following options are provided:

Grid Size can be 3 to 50. Note that larger grid sizes will take a long time to solve
Solve - Auto, computer will calculate the MagicSquare. For variable magic squares, the program uses a combination of random guesses and solution of equations in order to arrive at a solution quickly. Each variable magic square solution is likely to be different. For normal squares a combination of La Loubere and LUX methods are used
Solve - Manual, a blank grid is presented for user to enter numbers in the grid and solve the puzzle. Right click on a cell to a get drop-down menu for manipulating cell values
Print - Print the solution and the empty grid for attempting solution on paper. Maximum grid Size that can be printed is 30
Many more interesting options

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Makenum

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version 2.0
Updated 24 November 2005

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The purpose of this challenging game is to make a number from a set of six numbers.

The computer selects the number that you are required to make along with six other numbers. You select any two numbers and apply addition, subtraction, multiplication or division to get an answer. This answer is added to the set of remaining numbers. You repeat this process until the desired answer is obtained.

In order to make 468 from 1,22,34,7,13,25 one solution would be:

7 + 13 = 20
25 - 1 = 24
20 * 24 = 480
480 + 22 = 502
502 - 34 = 468

Note that you may use a number only once. You may use the required number for intermediate calculations. In order to select a number click left-mouse-button on the number Click on + - / or * for mathematical operations. All six numbers must be used for the target.

The updated version has auto solution by computer and user can specify a puzzle for computer to solve.

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Masyu

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version 1.0
Updated 14 May 2007

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Masyu is played on a rectangular grid of squares, some of which contain circles; each circle is either white or black. The goal is to draw a single continuous non-intersecting loop that properly passes through all circled cells. Rules of the puzzle are:

Make a single loop. Lines must pass through the centers of cells horizontally or vertically and never cross, branch off, or go through the same cells twice.
Lines must pass through all cells containing black and white circles.
Lines passing through a white circle cell must go straight through the cell, then make a right-angled turn in the very next cell (on at least one side of the white circle cell).
Lines passing through a black circle cell must make a right angled turn immediately, in the black circle cell, then go straight for the next two cells.

This program helps you solve existing Masyu puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different grid sizes from 6x6 to 20x20, with maximum Rows x Columns limit of 256.
Solve existing puzzles manually or let program solve it
Create new puzzles interactively or in bulk
Save puzzles as Ascii or bitmap files
Print puzzles and solutions
20,000 puzzles with solutions Download

maThjong

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version 1.0
Updated 24 January 2008

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Mahjong (also spelled mahjongg) is a Chinese board game involving skill, strategy, and calculation, as well as a certain degree of luck. There are many variations of this game but basic objective is to build complete suits, usually of threes, from a given set of tiles. MaThjong is Mahjong with a mathematical flavor.

Basic rules of this variant are:

The board consists of a number of tiles. Exact number depends on the size of the board, larger board will have more tiles.
Tiles are stacked on each other, except those at the edges of the board
Each tile has a randomly selected number. Maximum number depends on the size of the board, larger board will have a longer range of numbers.
You are required to remove tiles from the board by selecting three tiles at a time
A selected tiles must be open, that is there is no tile on top of it
Numbers on three tiles MUST be related mathematically (sum, product etc) as specified in the rules of the game
Three matching tiles will be removed from the board. Any tiles directly beneath will be opened.
You play against a given time. More time is given for larger boards.
You continue removing tiles until: timer has expired; board has 2 or less tiles or you decide to end the game
Scoring is done when you play within a given time limit. You can play without any time limit - no scores are kept in this mode.

This game requires considerable visual and mathematical thinking. Main features of this program are:

Grid size from 3 to 16
Tiles shapes: square flat, square raised, square rounded, circular or octagonal
Try to beat the clock with maximum score or play without time limit
Get hints or let computer solve a grid
Different colour schemes

Mirrors

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version 1.0
Updated 10 November 2007

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Mirrors, derived from Japanese puzzle Masyu, is played on a grid of squares, some of which contain 'mirrors'. The goal is to draw a single continuous non-intersecting loop that properly passes through all cells. Rules of the puzzle are:

Some cells in the grid contain 'mirrors' of the following type:
- Blocked - a line cannot pass through such a cell
- Tunnel - a lines must pass in the direction of the tunnel, vertical or horizontal
- Reflection - a line must reflect at right angle
In an open cell without any mirror, line can go vertical, horizontal or at right angles
Only one line can go through a cell

Like many other combinatory and logic puzzles, Mirrors can be very difficult to solve.

Main features:

This program helps you solve existing Mirrors puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different grid sizes from 7x7 to 20x20.
Solve existing puzzles manually or let program solve it
Create new puzzles interactively or in bulk
Print puzzles and solutions
20,000 puzzles with solutions are provided

Download Puzzles

MirrorMaze

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version 1.0
Updated 10 November 2007

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MirrormMaze, derived from Japanese puzzle Masyu, is played on a grid of squares, some of which contain 'mirrors'. The goal is to draw a single continuous non-intersecting loop that properly passes through all cells. Rules of the puzzle are:

Some cells in the grid contain 'mirrors' of the following type:
- Blocked - a line cannot pass through such a cell
- Tunnel - a lines must pass in the direction of the tunnel, vertical or horizontal
- Reflection - a line must reflect at right angle
In an open cell without any mirror, line can go vertical, horizontal or at right angles
Only one line can go through a cell

Like many other combinatory and logic puzzles, Mirrors can be very difficult to solve.

Main features:

This program helps you solve existing Mirrors puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different grid sizes from 6x6 to 15x15.
Solve existing puzzles manually or let program solve it
Create new puzzles interactively or in bulk
Print puzzles and solutions
20,000 puzzles with solutions are provided

Download Puzzles

nashE

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version 1.0
Updated 14 May 2008

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Introduction
This program is a simple game using a board layout based on Nash equilibrium (named after John Forbes Nash, who proposed it). This game is not about demonstrating the equilibrium theory or its application. Nevertheless some principles of the equilibrium theory would apply when you play this game against the computer.

Board Layout
A 3x3 matrix contains nine numbers distributed randomly. Player 1 has numbers 1 to 9 in the bottom left while player 2 numbers 1 to 9 are in the to right corner of a cell.

Objective of the Game
Players 1 and 2 move alternatively. Purpose of this game is for a player to maximise its score.

How to Play

Player 1 start first by selecting a one of the three rows
Once a row is selected, player 2 must select a column in that row
Player 2 then selects a column:
- If player 2 selects same column as the row number (eg column 3 if row 3 was selected by player 1) then the respective numbers in the common row/column are added to player scores and game ends
- If player 2 selects a column (eg column 1 in row 2 selected by player 1), numbers at the intersection row and column are added to player scores
- Game continues and player 1 selects another row - then step 2 above follows ...

Program Options

Select player types: manual or computer. User can play player 1 or 2 but player 1 always starts the game
Select how a game ends:
- When same row/column are selected (default and normal mode)
- When only one cell is left. This game would last longer.
Board and player colours
Pause at computer moves

nDrop

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version 1.0
Updated 6 June 2008

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A small but tough puzzle. The layout is that there are three numbers at the top and three rows of 4 numbers each underneath. Each of the three rows has an empty cell. You are required to align three empty cells under one of the three numbers at the top. The number will drop down the empty column if the number is greater than or equal to numbers on the left and right of the empty column. Game ends when you drop down all three numbers.

How to Play

You can rotate rows and columns covering 12 numbers and three spaces. Your aim is to align numbers on the left and right of an empty column so that the number at the top may be dropped down. Note that a number can be dropped down the empty column if the number is greater than or equal to numbers on the left and right of the empty column.

Click the control button on the right of a row of numbers. Left click to rotate left and right click to rotate right.
Click the control button at the bottom to rotate a column up or down. Left click to rotate down and right click to rotate up.
When an empty column has been aligned beneath a number at the top, click the control above the top number. Number will drop if it is greater than or equal to numbers on the left and right of the empty column.
Game ends when all three numbers at the top have been dropped
Each puzzle has a valid solution

nLock

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version 1.0
Updated 26 March 2008

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Break the lock combination and make four numbers from a set of eight numbers and four plus and minus. Given numbers are on two circles, four horizontal and four vertical, and signs are on one circle in the middle. A pair of numbers and a plus/minus sign are aligned forming an equation and a resulting number. Rotate circles - and numbers and signs on them to get four target numbers. Like a locker combination there is only one unique set of locations that will give the desired four numbers. Use your spare time to stretch your mental math capabilities.

How to Play

Left click on a number or a sign to rotate all numbers and signs on the circle to left. Resulting numbers will be recalculated.
Right click on a number or a sign to rotate all numbers and signs on the circle to right. Resulting numbers will be recalculated.
All games are solvable

noneighbors

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version 1.0
Updated 7 June 2007

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NoNeighbors is a Suduko look alike with some subtle differences. This puzzle has following rules:

A puzzle has a 9x9 grid
Each row and each column must be filled with numbers 1 to 9; no duplicate numbers in a row or a column
Neighboring cells cannot have neighboring numbers.
- Left, top, right or bottom numbers around a cell cannot have numbers +1 or -1 of the number in the cell.
- For eaxmple if a cell has value 5, none of the left, top, right or bottom cells can have numbers 4 or 6.
- Neighboring numbers for 1 will be 2 and 9, and for 9 will be 1 and 8.
- Following is a list of neighboring numbers:
  1=2 and 9; 2=1 and 3; 3=2 and 4; 4=3 and 5; 5=4 and 6; 6=5 and 7; 7=6 and 8; 8=7 and 9; 9=1 and 8

Like Suduko, this puzzle can be rather difficult to solve. This program helps you solve existing puzzles as well as create new ones.
This program helps you solve existing noneighbors puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different levels of difficulty
Solve existing puzzles manually
Create new puzzles one at a time or in bulk
Save puzzles as Ascii or bitmap files
Print puzzles and solutions
20,000 puzzles with solutions Download

nSequence

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Version 1.0
Updated 4 July 2008

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You are required to adjust a series of numbers to be in sequence. Numbers are adjusted by taking away 1 or 2 from one cell and transferring to another. A numbers in a cell must be taken away only once. However, numbers can be added to a cell more than once. 20,000 puzzles with solutions are provided with this program.

How to Play

During play you try to sequence the numbers by taking away and adding numbers from one cell to another:

A puzzle will comprise 4 to 10 cells.
Cell numbers must be adjusted to number 1 at left increasing by one to number N at right, where N is the number of cells
Left click on a cell, move mouse over to another cell and left click again. Source cell value will be reduced by one and target cell value increased by one.
Right click on a cell, move mouse over to another cell and left click again. Source cell value will be reduced by two and target cell value increased by two.
A cell value can be reduced by one or two, and once only
A cell value can be increased multiple times
All cells must be used

Program Options

Save and reload puzzles
Create puzzles with random or selected number of cells
Set display colour schemes
20,000 puzzles with solutions Download
Set display colour schemes

nSeq2D

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Version 1.0
Updated 13 July 2008

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You are required to adjust a series of numbers to be in sequence. Numbers are adjusted by taking away 1 from one cell and adding it to one of its neighbouring cells. A numbers must be added to a cell once only. However, numbers can be removed from a cell more than once. 20,000 puzzles with solutions are provided with this program.

How to Play

During play you try to sequence the numbers by taking away and adding numbers from one cell to another:

A puzzle will comprise 3x3 to 9x9 grid
Each cell has a random number, maximum number being the grid size
Cell numbers must be adjusted such that row 1 of the grid has number 1 in all columns, 2 in row 2 and n in the last where n is the grid size. For example in a puzzle of size 7x7 the last row must have 7 in all columns.
Left click on a cell, move mouse over to a neighbouring cell (left, top, right or bottom) and left click again. Source cell value will be reduced by one and target cell value increased by one.
A value can be added to cell only once while values can be deducted multiple times
A value must be added to each cell in the grid

Program Options

Save and reload puzzles
Create puzzles with random or selected number of cells
Set display colour schemes
20,000 puzzles with solutions Download
Set display colour schemes

nTangle

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version 1.0
Updated 23 January 2007

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Welcome to nTangle: Untangle a web of intersecting lines, from very easy to very hard. A simple and relaxing way to pass your time.

Download More than 20,000 puzzles with varying level of difficulty

This is how you play:

Set the number of nodes (8 to 128) and click Generate, a new tangled puzzle will be created
Click and drag each node, tangled lines connected to the node will move
Reposition the nodes to untangle lines

The following program options are provided:

Specify puzzle size: fixed, range, above or below a specified number of nodes
Create new puzzle, each puzzle is unique
Create multiple puzzles and save to a file
Append new puzzle to existing puzzle files
Save new puzzles, 20,000 puzzles are provided with this program
Load new puzzle files
Select a puzzle to tackle from a file
Zoom in and out of tangled lines to get more space to work with
Adjust puzzle location to focus on a specific area of a puzzle
Get status of untangled lines; shown in green
Set different color schemes
Adjust the size and color of dots and lines
Let computer untangle a puzzle
Undo your moves
See bubble help for different command buttons

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NumberLink

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Version 1.0
Updated 30 May 2008

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Number Link is a Japanese logic puzzle published by Nikoli (2006).
The player has to pair up all the matching numbers on the grid with single continuous lines (or 'paths'). The lines cannot branch off or cross over each other, and the numbers have to fall at the end of each line (i.e. not in the middle). All cells must be filled with line and there is only one unique solution for a puzzle. Fans of Sudoku, Kakuro, Hashi and the like are sure to find this logic puzzle a refreshing challenge! 20,000 Puzzles provided with this program have unique solutions. Program handles puzzle size 5x5 to 16x16.

Generally NumberLink puzzles are rather easy to solve - size 8x8 and below in particular. Nevertheless they are good fun to try. This program will generate puzzles that have unique solutions. Caution - puzzle size 12x12 and above may take some time to generate.

How to Play

Normally you would print a puzzle and solve it on paper at your leisure. You can also connect numbers on screen using the following commands:

Leftclick mouse on a cell and drag mouse to the new location
Release leftclick to draw a line
A line can only be vertical or horizontal
Can draw a line in many horizontal and vertical segments if necessary
Cannot cross lines
Cannot draw a line through a number
Must connect same numbers together
Each puzzle has a unique solution

Program Options

Select line and number colours of your choice
Save and reload puzzles
Print puzzles and their solutions
20,000 puzzles with solutions Download
Set display colour schemes

Numgrid

Download now
version 1.0
Updated 12 July 2004

Help

In this game you are given a set of four numbers located at the corners of a 7 x 7 grid. You are required to fill the grid with numbers 1 to 9 and signs + - * to make the given four numbers.

How to play

Use left/right mouse buttons to place numbers and signs on the grid. You can print the puzzles, three puzzles and solutions per page.

The computer can also solve number grids. Under the Puzzle menu click 'Set a Puzzle for computer to solve'. Then set four numbers on the grid corners and click solve.

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nPairs

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version 1.0
Updated 20 March 2008

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In this game a set of 50 numbers (numbers 0 to 9 in five colours) are placed in 10 columns, 5 rows each. First 9 columns are the Working area. You are required to match and eliminate pairs from the working area. Game ends when all numbers have been removed. The tenth column is the Reserve area, a number can be moved any time from Reserve to Working area. Rules of the game are:

Rules:

A pair can be removed when:
- A number is adjacent to another, at: left, right, above, below, or diagonally adjacent
- Two adjacent numbers are of different colour
- Two numbers differ by one
- For example red 7 can be paired with black 6 or green 8. Nine can be paired with 8 or 0.
A number can be moved from Reserve column to the Working area, but in the same row
An entire row in the Working area can be shifted left or right eliminating all empty spaces, similary
A entire columns in the Working area can be shifted up or down eliminating all empty spaces
After you elimate pairs, you move rows and columns around in order to create possibilities for other pairs to remove
Game ends when all numbers have been removed
You can play this game with 3, 5, 7 or 9 columns working area with maximum number being 3, 5, 7 or 9 respectivelive. Same rules apply including the rule that the maximum number can also be paired with 0.
Score is mainitained only for the most difficult 9-column game

How to play:

Left click and drag-drop a number to the paired number. Both numbers will be removed if they are a valid pair.
In order to shift a row left, click on the board left to the start of the row
In order to shift a row right, click on the board right to the end of the row
In order to shift a column down, click on the board below the start of a column
In order to shift a column up, click on the board above the end of a column
Right click on a number in the Reserve column. The respective row will be moved left and the number will be moved to the first empty space in the row
Resize window to increase or decrease number size
Use Options to set number of columns, and fonts and colours of your choice

Reversudoku

Download now
version 1.0
Updated 20 April 2008

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This game is Sudoku in reverse - simpler but with even bigger challenge. Basically a 9x9 grid is already filled in with number 1 to 9, nine times. All you have to do is to identify nine segments of nine cells each, with each segment containing numbers 1 to 9. All 9 cells in a segment must be connected in one chain. Only hint you have is that if a number in a cell and a number in any of its four neighbors (left, top, right and bottom) add to 9 then both cells will belong to one segment. There are no other rules.

How to Play

Puzzles come in three levels:

Easy - One out of nine segments is already shown in the puzzle. And there are more of same numbers together in the grid making it easier to identify segment boundaries.
Hard - A segment is not ready marked. But there are more of same numbers together in the grid making it easier to identify segment boundaries.
Very Hard - No segment is ready marked and there are fewer placements of same numbers together.

Normally you would print a puzzle and solve it on paper at your leisure. You can also try a solution on screen using the following commands:

Creat a new puzzle of difficulty level of your choice. You can also load or print one of the 20,000 ready made puzzles (1.1Mb) supplied with this program
There are nine colours available to markup a cell for a segment
Select a colour by clicking the top right hand button
Click on a cell to assign it to a segment. Cell will be painted with the selected colour. Click again to clear a cell.
Click Show-9 pairs command button to see which cells must belong together in a segment.
When you mark a cell and there is a valid neighboring cell with total 9 then the neighboring cells will also be marked
Continue marking cells until you have identified all the nine segments
When marking cells, program will verify validity using the following checks:
- Duplicate values are not allowed in a segment. For example cannot mark number 1 twice in a segment.
- A cell not linked to a chain will not be marked. For example if you have marked two adjacent cells as red. Now you try to mark third cell which is not a neighbor of the existing two - this is not valid.

Hints

Reversudoku puzzles are simple but could be very difficult to crack. Here are a few tips to assist you with the solution:

Spot 9-pairs and mark them as each pair belonging to same segment
Note same numbers next to each other. There must be a segment division line between the two.
A number or a set of numbers (other than a full 1-9 segment itself) cannot be isolated. Connect such areas with adjacent segments.
Numbers in a segment must be all in vicinity of each other and must be connected horizontally or vertically. Look for shortest route to make a cluster of number 1-9.
However the best guide is visual scan and your inituition. Scan, relax and look for patterns of unique numbers together.

ShopAround

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version 1.0
Updated 20 May 2007

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ShopAround, a variant of Nicoli's Masyu game is played on a rectangular grid of cells. One cell is designated as Home. The remaining grid has a set of Shops and Gas Stations. The purpose of this game is to start from your home and return home after visiting all the shops and gas stations in the grid. Following rules will apply:

The trip must be in a single loop, starting and ending at home
Cannot go through a cell twice
Lines must pass through all cells containing shops and gas stations
Lines passing through a shop must go straight through the cell
A line reaching a gas station must make a right angle turn (left or right) at the station
Must go to a gas station at the start and at the end of the trip
Cannot go to two shops or two gas stations consecutively

Like Masyu, this puzzle can be rather difficult to solve. This program helps you solve existing puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different grid sizes from 5x5 to 10x10.
Solve existing puzzles manually or let program solve it
Create new puzzles interactively or in bulk
Save puzzles as Ascii or bitmap files
Print puzzles and solutions
20,000 puzzles with solutions Download

ShuntDown

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version 1.0
Updated 10 April 2008

Download 20,000 puzzles

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Numbers 1 to 9 in four colours are arranged randomly in two stacks. Rearrange these numbers, ascending or descending, in four stacks of four colours. You have nine working places and five reserve places to work with. This game is not easy and requires considerable planning and forethought as you move numbers around.

Rules

A game starts with 36 numbers - numbers 1 to 9 in four colours. 30 numbers are placed in Source Stacks and 6 in the Working Stack. Basically you have to shift numbers from Source Stacks to Solution Stacks as per rules below:

Draw numbers from the Source Stack into the Working Stack sequentially. Six numbers are ready filled at the start of a game
Move numbers around in 9-space Working Stack
Drop a number from the Working Stack to one of the four Solution Stacks. The number must be positioned over the stack.
A Solution Stack must be filled with numbers of same colour and in ascending or descending order
Use 5-space Reserve Stack to hold numbers and use them later in the Working Stack
As positions in the Working Stack become empty, draw additional numbers from the Source Stacks
Repeat steps 2 to 6 until all numbers from Source Stacks have been moved into the Solution Stacks

You need to examine each puzzle carefully and plan your moves upfront. Without a strategy the Working Stack will become full with no spaces left to move.

How to Play

You move and numbers around in different Stacks using the following:

Working Stack: You can move numbers to empty spaces in the row. Left click on a number, move mouse (without drag) to an empty space and left click again. Right click on a number to drop the number to a Solution Stack below.
Reserve Stack: Click on one of the empty positions in the Reserve Stack. The number below in the Working Stack will be moved up to the Reserve Stack. Click again to move the number down.
Source Stack: Click on number in Solution Stack in the same row as the Working Stack. When a number is shifted, the empty position in the Source Stack can be filled by the next (above or below) number in the Source Stack.
Solution Stack: Numbers in Solution Stack must be same colour and ascending or descending value. A number 1 or 9 of any colour may be dropped into an empty Solution Stack.
Automove: Program will move valid numbers automatically to a relevant Solution Stack. You can disable automove while shifting numbers in Working Stack. For this purpose left click on a number, move mouse (without drag) to an empty space and Right click again. The number or the numbers between two clicks will be shifted to the empty space without any automove to follow.

sLitherLink

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version 1.0
Updated 1 June 2006

Download 20,000 puzzles

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This program helps you solve existing sLitherLink puzzles as well as create new ones. Slither Link (also known as Fences and Loop the Loop) is a logic puzzle played on a rectangular lattice of dots. Some of the squares formed by the dots have numbers 0 to 3 inside them. The objective is to connect horizontally and vertically adjacent dots so that the lines form a single loop with no loose ends. In addition, the number inside a square represents how many of its four sides are segments in the loop. In this program you can:

Create new puzzles manually or automatically. Automatic creation offers unique puzzle each time with different levels of difficulty
Solve a puzzle manually or let program solve it
Save puzzles in different file formats
Print puzzles and solutions

This program has a puzzle size limitation of maximum 12 rows and 12 columns.

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SnakesLadders

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version 1.0
Updated 15 January 2008

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Snakes&Ladders is a well known old board game using a board and a dice. Its simplicity makes it popular with younger children, but there is a lack of any skill component. In this Mindgames variation, you use your brains instead of dice and play on your own. Basic rules and the features of this game are:

Rules

There is a square grid of size 5x5 to 16x16, populated with a number of snakes and ladders
You are given a set of numbers or steps
Purpose of the game is for you to start from number 1 and reach to the last number on the grid:
- Can only use the given step numbers
- Upon reaching a stair square, must jump up to the designated number- top of stair
- Upon reaching a snake square must move down to the designated number - end of snake
In order to win, you must reach the end of the board by using ALL the given steps
Games are provided in Easy and Hard mode
- In easy mode ALL snakes and ladders will be used in the solution
- In hard mode not all snakes and ladders are required; this makes the game difficult as you will also have to figure out which ones not to use
Normally you would print and the solve a puzzle on paper - you can also solve on screen if desired
Every puzzle generated with this program is of unique layout with a single solution
20,000 puzzles of varying difficulty are provided with this program

This game looks deceptively simple. As you will find out a lot of visual thinking and mental addition subtraction is required, for hard games in particular.

Options

Main options of this program are:

Grid size - 5x5 to 16x16
Difficulty level - Easy or Hard
Snake and Ladder display style - single line or staggered
Line colours and Line width
Display colour schemes
Grid style - flat, raised or depressed
Print puzzle, solution or both - single or in bulk
Generate single, or multiple puzzles in one go

How to Play

You would normally print a puzzle and solve it at your leisure. However you can also solve on screen:

Left click a cell and drag to another cell to draw a line
Corresponding step will be removed from the given set if your move matches a step
Move destination will be adjusted for a snake or a ladder
Can undo moves if required
20,000 puzzles of varying difficulty with solutions Download

SuDoKu

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version 1.0
Updated 17 November 2005

Download 20,000 puzzles

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The purpose of this program is to solve or create a SuDoKu puzzle. It is assumed that the user is already familiar with the concept and rules of this game. More than 20,000 sample puzzles are provided.

This program is based on rather simple but very successful algorithm. This algorithm may not be an optimum way of solving a puzzle. Once you have understood the basics of this process, an expert visual inspection process will definitely beat the computer.

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PentoMinos

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version 1.0
Updated 27 July 2007

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A pentomino is a geometric shape formed by adjoining five squares with one another edge to edge. There are twelve unique ways to do this (not counting rotations and reflections). Those twelve pieces (or blocks) are pictured here and make up the "classic" set of pentominoes. Traditionally each piece is named using the letter of the alphabet which most closely resembles its shape. Each of the twelve pentominoes (or blocks) by rotation or flip, can be tiled to make a shape, and a lot of fun with pentominoes revolves around filling or building given shapes. These make interesting puzzles. This program helps you solve existing PentoMinos puzzles as well as compile new ones.
Main features of this program are:

Create new puzzles manually from a pattern
Solve existing puzzles manually
Thumbnail view of all puzzles in a file
Save newly compiled puzzles
Print puzzles and their solutions
250 puzzles with solutions

x123

Download now
Version 1.0
Updated 6 June 2008

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You are required to fill a 5x5 grid with numbers 1,2,3 in each row and each column. Two cells in each row and column must therefore be blank. Number cannot be duplicated in a row or a column. You are provide 8 hints. A hint indicates what is the first number in a row or a column. 20,000 puzzles provided with this program.

How to Play

Normally you would print a puzzle and solve it on paper at your leisure. However you can also solve on screen using the following commands:

Click on a cell and enter a number (1,2 or 3)
Use arrow keys to navigate between cells
Must not use a number twice in a row or a column
Each puzzle has a unique solution

Program Options

Save and reload puzzles
Print puzzles and their solutions
20,000 puzzles with solutions Download
Set display colour schemes

ZeroSum

Download now
version 1.0
Updated 15 November 2006

Download More than 20,000 puzzles with unique solutions and varying level of difficulty

Help

ZeroSum puzzle is played on a square grid filled with numbers and +- signs. The objective of this game is to make a given sum of numbers by navigating through a grid of numbers and associated +- signs.

Rules of this game are:

Cells are filled with numbers 1 to 5 for a 9x9 grid, 1 to 4 for a 7x7 grid, and 1 to 3 for a 5x5 grid
One cell is designated as a clue cell, you must use this cell in your solution
Start from the bottom row of the grid and move UP, LEFT or RIGHT only ending at the first row
As you move from a number cell to another, apply + or - in between; the sum of numbers is calculated as you move up, left or right
You must have a sum of zero when you reach row 1
There are no duplicate numbers in a row or a column
There is only one unique solution for a puzzle
Use 5x5 grid for young children and 9x9 for experts with a lots of visual thinking.

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mindGames

an eclectic collection of games to pass the time and challenge the mind

Navigation

Math games

A2Bflip

Cardoku V1

Circolar

How to Play

Connect

How to Play

Program Options

FutoShiki V2

Hashiwokakero

Heyawake

Hitori

Kakuro

Liteit

Make9

Magicsquare

Makenum

Masyu

maThjong

Mirrors

Main features:

MirrorMaze

Main features:

nashE

nDrop

How to Play

nLock

How to Play

noneighbors

nSequence

How to Play

Program Options

nSeq2D

How to Play

Program Options

nTangle

This is how you play:

NumberLink

How to Play

Program Options

Numgrid

How to play

nPairs

Rules:

How to play:

Reversudoku

How to Play

Hints

ShopAround

ShuntDown

Rules

How to Play

sLitherLink

SnakesLadders

Rules

Options

How to Play

SuDoKu

PentoMinos

x123

How to Play

Program Options

ZeroSum