Daily Sudoku puzzle
One board, the whole world, one day. The difficulty follows the calendar.
Leaderboard
Keyboard
- Arrows or WASD — move
- 1–9 — enter a digit
- Del or Backspace — erase
- Space or N — pencil marks
- Z — undo, Shift+Z or Y — redo
- H — conflict highlighting on/off
- A wrong digit costs a life — you get 3 mistakes per game
Latest posts
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Four techniques that solve 95% of hard sudoku puzzles
Naked single, hidden single, naked pair and locked candidates. Nothing beyond that is needed to close almost any hard board — and none of it involves guessing.
