25 variants
The labaratory rat has to eat the three cheeses and return home.
Sounds simple? - Wait until the additional walls drop!
The cheese gives enough strength to gnaw through some walls.
LANGTON'S ANT (V2.0)
7 variants (updated 22 Feb 05)
a cellular automaton of scientific interest
(because it is at the border between order and chaos)
(both updated 23 Feb 07)
12 variants and 18 variants
A certain number of mirrors is placed randomly.
Place additional mirrors so that each mirror is hit by the laser ray.
In Laser II the board is a cylinder.
(both uupdated 23 Feb 07)
A certain number of mirrors and lightbulbs is placed randomly.
Place additional mirrors so that each mirror and each lightbulb is hit by the laser ray.
LASER MAZE (V1.0)
(created 2 Feb 2005)
Cross the room without getting hit by a laser beam.
LATTICE (V10.0)
Geometrical Dissection Problems / Basic Line Drawing Tool
46 variants (updated 5 June 06)
16 directional buttons.
Problems have been mostly taken from my three geometrical puzzle books
Geometrical Dissection Problems / Basic Line Drawing Tool
46 variants (updated 5 June 06)
16 directional buttons.
Problems have been mostly taken from my three geometrical puzzle books
LEFTTURN (V1.1)
52 variants (updated 12 March 06)
The car can only go straight or turn left.
Find the longest path.
LETTERDROP (V1.1)
3 variants (updated 8 Dec 09)
Find words and thus clear the board.
LIARS (V1.1)
30 variants (updated 9 Jun 07)
Numbers represent the number of truth-telling neighbours.
Find out where the liars live!
LIGHTSHOW (V1.0)
1 variant (created 13 July 05)
Controllable series of animated lightshows.
LINEAR (V1.1)
30 variants (created 12 July 05)
A linear cellular automaton with 3 colours
and two randomizing buttons make a fun game.
LINEDRAW (V1.1)
1 variant (created 12 Jan 08)
A basic but fun line drawing tool.
Binary logic demonstration tools (updated 4 Nov 2004)
8 boards up to 6x6, many variants, each fully customizable to your needs!
AND, NAND, OR, XOR, NOR, ID, EQ, NOT gates
and lots of electron guns, blocks, and lightbulbs to play with...
16 randomized variants (updated 13 Sep 07)
Given a randomized pattern, you have to create one continuous loop.
However, you are only allowed to swap some parts...
LOST IN THE CITY (V1.6)
52 variants (20 fixed, 32 random setup)
(updated 20 Sep 07)
Visit as many streets as possible with your car.
(updated 2/12/2004)
each with 30 fixed and 6 randomized variants
Bumped marbles disappear.
Eliminate all marbles but one.
(updated 2/12/2004)
Bumped marbles disappear. Eliminate all marbles but one.
Additional walls make the task more difficult.
(updated 14 Mar 2003)
6 variants
Cover the 4x4 board with the given 2x2 tiles.
MATCHSTICKS (V3.1)
(updated 23 Nov 2004)
28 variants
Classical Matchstick-problems
Now most varaints with win-message!
MATCHSTICKS II (V1.1)
(created 23 Nov 2004)
1 variant
Freeplay - version of the original Matchstick game
(updated May 6, 2001)
3 variants
Basic maths learning game.
Add two numbers.
3 variants
Basic maths learning game.
Multiply two numbers.
(updated May 6, 2001)
3 variants
Basic maths learning game.
Subtract two numbers.
(created July 3, 2001)
3 variants
Basic maths learning game
for children and adults.
Solitaire tiling game (updated 16/4/08)
8 variants with 19 shapes to fill
Adjacent tiles must differ in colour.
You can even create your own shapes to fill in!
Solitaire tiling game
(updated 2/12/04)
MAXICOL (V2.0)
Solitaire tiling game
15 variants (updated 13 Mar 08)
Several new map colouring problems.
MAZE HAVEN (V1.1)
Solitaire tiling game
(updated 24 Dec 2004)
4 randomized variants
2 randomized variants
Memorize an ever increasing sequence of images.
In the second variant a picture may occur twice in a row.
(updated 2 Dec 2004)
34 randomized variants
Memorize the positions of butterflies.
(updated 24 Feb 2003)
1 randomized variant
Find the missing butterfly type.
(updated 15 Apr 2003)
1 randomized variant
Gain points by making loops.
MOKU (V1.0)
(updated 18 Jan 2008)
2 randomized variants
Remove all stones, 5-in-a-row at a time.
MONDRIAN (V1.0)
(updated 26 Nov 2004)
4 randomized variants
Create nice foto frames (or Mondrian paintings ?).
NAPIER'S ABACUS
(V1.0)
(created Sep 05)
2 randomized variants
Learn about the middle-age version of binary math
(created Sep 05)
2 randomized variants
Learn about the middle-age version of binary math
MORRIS PUZZLE (V2.0)
(created Sep 05)
2 randomized variants
Recreate the original setup
(updated 1 Sep 08)
11 variants
Re-create the setup at right by toppling polycube sticks.
NATURE-WALK (V1.3)
(updated 27 Oct 07)
55 variants (5 randomized)
Visit all insects while avoiding the trees.
NIGHTMARE QUILT (V1.0)
(created Feb 09)
1 randomized variant
Find the little square amongst the triangles
(updated Sep 2005)
1 randomized variants
Click the board for a randomized setup; then reset all clocks to 12 o'clock!
The clocks are connected and advance at different speeds.
61 variants (created 9 Feb 2004)
Move the ball into the hole.
Similar to game 'Rotoscope',
but one telescope is missing and has to be inserted.
Similar to game 'Rotoscope',
but one telescope is missing and has to be inserted.
NOSQUARE (V2.0)
10 variants (updated 27 Mar 2009)
Rerarrange in order to
avoid compound squares.
48 variants (updated 11 Feb 07)
Strips with numbers have to be placed on the board.
Where the strips cross, the colours must match. All problems are solvable.
Variants with 2,3,...,9 colours, boards 4x4 to 9x9.
Definitely something for Sudoku fans!
NUMBERWHEEL (V1.1)
Classic puzzle (updated 29 Apr 2003)
4 variants
Order numbers on wheel.
(updated 7 Dec 2004)
93 variants !
Tile the given shapes with the amazing Nutts tiles.
With Nutts V2.0 you can also redesign the board very easily.
(new 14 Dec 2002)
1 variant
Solves Nutts problems atuomatically.
Number of tiles per type can be 0, 1 or infinite.
ODD
ONES (V2.0)
(updated 9 Apr 05)
28 variants (18 randomized)
Delete all symbols which have no similar neighbour.
(updated 9 Apr 05)
28 variants (18 randomized)
Delete all symbols which have no similar neighbour.
2 randomized variants
Create a simply connected oneway loop
by swapping sections of the loop.
(updated 6 Aug 03 and 14 Dec 02)
39 variants
Tile the given rectangles with P-heptominoes.
P-Backtrack does it automatically.
1 randomized variant
Turn two buttons over at a time and find the matching pairs.
(updated 15 Mar 2003)
1 randomized variant
Flip piles of pancakes to order them by size.
PA-O-SI (V1.1)
(updated 1 Nov 05)
10 randomized variants
Match patterns all the way along the spiral.
PATHWAYS (V2.0)
(upated 22 Mar 08)
20 randomized variants
Create a loop or continuous path (red or blue) with the given pieces.
s (updated 7/3/2001 and 15/3/2001)
6 variants each
Separate the colours by shaking the box at certain places.
(updated 9 Jun 07)
25 variants
Tile the given shapes with the 12 pentominoes.
You can even create your own shapes to fill in!
(updated 31 Dec 01)
22 customizable variants
An elaborate automatic pentomino problem-solving tool.
For each piece type you can fix whether it is used once, often or not at all.
PHONE (V1.1)
2 variants.
One of the telephones on the left side turns red and rings.
Pick up the phone on the right border which is connected to it.
The cabling is randomized giving a new challenge in each new game.
PHONE II (V1.1)
(note that the original "Phone" game is listed under "Telephone")
(updated 8 May 06)
4 random variants
Pick up the right phone.
1 randomized variant
One of the telephones turns red and rings.
Pick up the phone which is connected to it.
The cabling is randomized giving a new challenge in each new game.
(updated 5 Sep 06)
49 customizable variants
Play with photons and mirrors.
You can even build a computer with these parts!
(created Jan 2010)
2 variants (including one randomized)
Recreate the image using knight hops only.
(created Jan 2010)
2 variants (including one randomized)
Recreate the image using knight hops only.
PODO (V1.0)
(created 19 Dec 05)
2 random variants
Match the black spots of adjacent 4x4 tiles.
PODOMAX (V1.0)
(created 23 Feb 07)
12 random variants
Match the black spots of adjacent tiles.
(created 6 Mar 07)
16 random variants
boards 3x3 to 16x16 !
Match the sides of adjacent tiles.
POLYHEXES (V1.0)
(updated 4/06/2005)
101 variants !
Many new challenges with these interesting tiles.
POLYHEXES II (V1.1)
(updated 23 Feb 07)
81 variants !
Many new challenges with these interesting tiles.
(updated 30 Jun 07)
22 variants (including 8 randomized)
Elminate all tokens apart from one.
Move as many steps as there are tokens on the line.
4-in-a-square also disappear.
(updated 16 Jun 07)
43 variants
Elminate all tokens apart from one.
Move as many steps as there are tokens on the line.
1 variant
You are an air traffic controller.
Steer the planes to avoid any accidents.
PROON (V2.1)
(created 11 Sep 08)
80 variant, some randomized
Turn all balls into walls.
The balls turn into walls when they meet another of same colour.
PUM-NUM (V1.0)
(created 9 Sep 07)
15 variants
Order the numbers by pushing and pulling two numbers at a time.
(updated 20 Sep 07)
more than 100 challenges!
Push and pull objects into the target area.
There are also passages and one-way doors.
(a Sokoban-relative)
(updated 14 Oct Sep 07)
50 challenges
Push and pull objects into the target area.
There are also passages and one-way doors.
(a Sokoban-relative)
4 variants
(updated 3 Oct 2004)
Classic 3D-puzzle
QUADRILLES
Classic Domino Puzzles
5 variants
2x2 squares must show same numbers
(updated April 10, 2001)
39 variants
(13 types of rules, three types of boards: 4x4,6x6, 8x8)
Get rid of the tiles which cover the picture.