Othello

How to play

Black plays first. Place a disc on a marked square to trap one or more opposing discs between the new disc and another of your colour. Every trapped line flips, horizontally, vertically, and diagonally.

If a player has no legal move, their turn passes automatically. When neither player can move, the player with more discs wins; equal counts are a draw.

Dashed circles mark legal moves; four small green corners mark the last square played. Use arrow keys to explore the board and Enter or Space to play. Corners cannot be flipped.