The Best Free Online Reversi AI Game in 2026 — Play Against Minimax Algorithm
Reversi (also known as Othello) is a classic two-player strategy board game — on an 8×8 board, black and white take turns placing pieces, flipping opponent pieces that are "sandwiched" between the new piece and existing friendly pieces. Rules can be learned in 2 minutes, but mastery requires deep understanding of corner control, stable disc strategy, and mobility advantage.
MeTool Reversi lets you play against AI directly in your browser. Three difficulty levels (Easy / Medium / Hard) use different depths of Minimax + Alpha-Beta pruning search. Easy mode is perfect for learning the rules, while Hard mode's AI searches 6 levels deep for a genuine strategic challenge. Zero registration, zero download — just open and play.
What Makes MeTool Reversi Unique
Three AI levels, precision-matched to your skill: Easy (depth 2) lets beginners learn flipping mechanics at a comfortable pace. Medium (depth 4) actively fights for corners and stable discs. Hard (depth 6) uses a full positional weight table + mobility evaluation + endgame counting, delivering a real challenge for experienced players.
Real-time visual feedback: Valid moves are marked with green dots, the last move is highlighted with a yellow ring, flipped pieces have a 180ms 3D flip animation, and the board pulses during AI thinking — every move has clear visual feedback.
Complete game experience: Supports Pass (skip when no valid moves), new game, and win/lose/draw detection. After the game ends, a share card automatically shows the black/white score and AI difficulty level.
Pure frontend, zero privacy concerns: All AI computation (Minimax search) runs in your browser — no data is ever sent to any server. Open the page, choose a difficulty, and start playing.