Reversi
Outflank and flip discs on an 8×8 board against a four-level computer or a friend.
Black to move.
How to play
- Place a disc so it traps opposing discs in a straight line (any of 8 directions); they flip to your colour. You play Black against the computer.
- Dots show your legal moves; the last move is ringed. If a player cannot move they pass; the game ends when neither can.
- Easy is greedy and makes mistakes. Hard looks 2 moves ahead. Extreme searches 4 moves using corners, edges and mobility. Nightmare searches as deep as it can in about 0.6 s and plays the last 10 squares perfectly.