- Foritensum "IQ test"
- This is meant to be a very difficult test. I think very few people will get more than a few points.
- 3x3 sequences
- Fill in the missing 3x3 grids. Quite difficult, but you will see your score immediately and can try more than once.
- Dynamic Maze
- Find a path through a dynamic maze so you will end up in the top left corner regardless where you start.
- Horse's Journey
- Move a knight over a chess-like board. This allows you to play with a puzzle that was posted to the USENET group rec.puzzles in December 2000.
- Artists, Materials and lots of D
- A very difficult multi dimensional problem. I haven't figured out the answer myself yet.
- Triangles on a sphere
- This is a non-trivial but solvable problem.
- Soma Cube
- A few not too difficult puzzles with a Soma Cube.
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