Zdoku is a free Sudoku app with three ways to play.
ZEN MODE
Solve at your own pace. No account required. Long-press a cell to pencil in candidate numbers, and toggle real-time mistake checking on or off.
LEADERBOARD MODE
Solve against the clock across four difficulty levels — Easy, Medium, Hard, Expert — and see your time next to other players.
MULTIPLAYER MODE
Create or join a room with up to 4 players and solve the same puzzle together. Each player's correct entries are marked with their color. Rematch when a round ends.
FEATURES
• Four difficulty levels
• Pencil-mark notes
• Real-time multiplayer, public and private rooms
• Global leaderboard
• Pause anytime in Zen mode
• Several color themes
• English, Spanish, French, and German
• Free, no ads, no in-app purchases
Free Sudoku with real-time multiplayer races, leaderboards, and no ads.