Othello Online Game

Othello (also known as Reversi) is a classic strategy board game. This free online tool lets you play against a computer AI instantly — no download or registration required.

The game is played on an 8×8 grid. Players take turns placing pieces to outflank and flip the opponent's pieces to their own color. The player with the most pieces on the board at the end wins.

Key Features

• Play vs Computer AI: Challenge a built-in AI with multi-step lookahead strategy that prioritizes corners and key positions.
• Choose Your Color: Pick black (first move) or white (second move) before each game to try different opening strategies.
• Live Score Tracking: Real-time piece count for both sides displayed throughout the game.
• Invalid Move Feedback: Visual and toast notifications when an invalid position is clicked, reducing accidental moves.
• Auto Pass Detection: When no valid moves are available, the system automatically passes the turn per standard rules.
• Restart Anytime: Restart with the same color or choose a new one at any time.

Who Is It For

• Casual players looking for a quick mental workout
• Beginners who want to learn Othello rules in a guided environment
• Anyone looking to sharpen logical thinking and spatial reasoning

How to Play

By default, the player plays as white and the computer moves first as black. Click "Change Color" at the bottom to choose your color before starting. On your turn, click any highlighted cell to place a piece — the board updates automatically and the turn switches.

FAQ

• Q: Why can't I click some cells?
  A: In Othello, a move is only valid if it outflanks at least one opponent piece. Cells that don't meet this condition cannot be selected.
• Q: What happens if I have no valid moves?
  A: The system automatically detects this and passes your turn to the opponent, following standard Othello rules.
• Q: How do I switch sides?
  A: Click the "Change Color" link below the board, select your preferred color, and the game restarts automatically.
• Q: How strong is the computer AI?
  A: The AI uses a multi-step strategy with preference for corner positions, providing a reasonable challenge for casual players.