Tap a cell to select it.
Tap a digit at the bottom row to fill it ito the selected cell.
Use eraser to clear the curret cell.
Tap the Note butto to tur o the draft mode.
Use hits wisely to reveal ay cells.

Sudoku Challenges is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9 × 9 grid with digits so that each column, each row, and each of the nine 3 × 3 sub-grids that compose the grid (also called "boxes" or "blocks") contain all of the digits from 1 to 9. Each puzzle will start at a partially completed grid, which has a single solution.