The competitive Sudoku arena
Play a Sudoku battle online
Challenge the house computer or queue for a live Sudoku opponent. Pick one of ten computer strengths and four puzzle difficulties, then start immediately in your browser. Guests can play without registering, while signed-in fights contribute to ratings and the leaderboard.
Race gives both players the same puzzle and rewards the first complete solution. Battle uses one shared board where each correct square claims territory. Duel runs for five minutes and awards the fight to whoever places the most correct digits before the clock expires.
A computer fight begins immediately and makes it easy to practise each rule set before playing online. Live matchmaking pairs you with the next player who chooses the same mode and difficulty. Signed-in opponents receive rated results; guest matches remain available without registration. The board shows both competitors’ progress throughout the fight, so every correct digit can change the pressure and the result.