The GoalFill the 9×9 board so every row, column, and 3×3 box contains 1–9 exactly once.
SelectingTap a cell, then tap a number below to place it. Tap the same number again to erase.
NotesToggle the pencil to jot down candidate numbers inside a cell.
HintsReveal a correct number when you're stuck — limited per puzzle.
MistakesThree wrong entries end the round, so choose with care.