RankDoku

RankDoku brings competitive Sudoku duels to the browser where two players face each other on one shared grid. Every correct number claims territory, mistakes freeze your board, and a shared clock decides who cracks first.

Play through ranked matchmaking across Bullet, Blitz, and Rapid time controls, or practice solo against the engine with no signup required. The platform features separate ladders for different formats and time controls, private friend rooms, 3 to 6 player party lobbies, and weekly mastery challenges on a single leaderboard.