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About Sudoku
Four daily puzzles, Easy, Medium, Hard and Expert, appear every day at midnight Korea time, and everyone gets the same ones. Easy and Medium need only singles, Hard needs techniques up to the X-Wing but never guessing, and Expert calls for chains. Every puzzle has exactly one solution, and Practice mode gives you as many new puzzles as you like.
Use pencil notes, undo and hints. The timer pauses when you lock your phone or switch apps and picks up where you left off. Games and records stay in this browser; no account needed.
What happens if I enter a wrong number?
Numbers that don't match the solution turn red and count as a mistake. There's no mistake limit, so you can always finish the puzzle.