Sudoku

How to play

• Tap a square, then tap a number. Every row, column and 3x3 box must hold 1 to 9 exactly once.
• Turn on Notes to pencil in candidates. Placing a correct number wipes that note from its row, column and box.
• A wrong number turns red and counts as a mistake. There is no limit, so keep going.
• Stuck? A hint fills in the selected square, or a random one if nothing is selected.

Three levels

• Easy - plenty of numbers given, solvable by spotting the only possible spot.
• Medium - fewer numbers, still pure logic without guessing, but you have to scan harder.
• Hard - a sparse grid that needs pencil notes and smarter techniques like pairs.
• Every puzzle has exactly one solution.

Daily puzzles and records

Each level has one daily puzzle that is the same for everybody, so you can compare times. Solve at least one daily puzzle a day to grow your day streak. Best times only count when you finish without hints. Want more? New puzzle deals a random one at the same level, as many as you like.

Keyboard: 1-9 to fill, arrows to move, N for notes, Backspace to erase, Ctrl+Z to undo.