An "intellectually stimulating variation of Othello".

Abridged rules:

1. The object of the game is to get to the other side of the game board.
2. The game board is divided into squares, but you're not told how many squares wide or long it is.
3. You can only step on a square if it has a tile on it. You can step on any tile, even if it was made by another player.
4. If you step on an empty square, or the tile you're standing on breaks, then you "fall in" and have to swim back to the nearest tile.
5. Each empty square that either borders a tile or the starting edge of the game board has a question visible on it. The questions are very simple and have single answers, such as "why does water flow downhill?" or "why can light pass through glass?" or "what is heat?"
6. The only way to make new tiles is by making-up an answer to the question.
7. A tile will only float if you can verify the answer with a reproducible test.
8. A tile can only be broken by proving the answer is wrong with a reproducible test.
9. A test can't break a tile if its results can't be reproduced, a tile can't float if the verifying test's results can't be reproduced.
10. If a tile is broken, then all tiles ahead of it that cannot be connected back to the starting edge by another continuous series of tiles will be broken as well.
11. A player is defined as someone who obeys the rules. If you stop obeying the rules you cease to be a player until you start obeying the rules again.

Further explanation of the rules can be found at:
http://www.disenchanted.com/technology/game.html