Sudoku

Fill every row, column, and 3×3 box with the digits 1–9. The clock starts when you make your first move.

• Number pad: highlights every placed copy of that digit — a way to survey the board
• Tap a cell: opens the halo picker; pick a digit to place it (✎ Notes for pencil marks)
• Keys: arrows move · 1–9 place · N notes · Backspace erase · P pause