Reversi (Othello) — Play Online Free

Reversi is the quiet board game that flips — literally. Place a black disc so that it brackets one or more white discs between your new piece and another of yours, and everything bracketed changes colour in the same move. A single placement can swing a whole line, and the lead can change hands twice in three moves, which is why experienced players refuse to trust the score until the final third of the game. You play black against a white computer opponent on the standard 8×8 board, with every legal move highlighted so the rules teach themselves as you go.

The corners are the constitution of this game: a disc in a corner has no flanking line through it and can never be flipped. The cells touching a corner are therefore poison early — occupying them hands your opponent the route in. The counter-intuitive discipline of Reversi is accepting fewer discs for most of the game: a thin, controlled frontier gives your opponent fewer places to attack, and the player who grabs every available flip usually donates the corners that decide the endgame.

The game is old enough to have two birth certificates: it surfaced in England in the 1880s under the name Reversi, and was reinvented decades later in Japan as Othello, the version that went on to hold world championships. The rules here are the classic set under the historical name — same board, same flipping, no trademark baggage — and the AI across its three levels plays the positional style the game has rewarded for over a century.

Three computer strengths track you from tolerant to sharp, an unlimited undo makes every experiment reversible, and the cursor keys plus Enter play the whole game from the keyboard if you prefer. The disc counters above the board update after every placement, and the result screen offers your final tally for sharing, so a hard-won endgame has somewhere to go besides your own satisfaction. The most common errors are all positional: seizing every flip offered, drifting into the cells diagonal-adjacent to untouched corners, and panicking when the disc count dips — the tally on screen means little until the last dozen cells. Nothing to install, nothing to sign, and the board resets instantly whenever you want the next game.