OBJECTIVE
Fill every empty cell with a digit from 1 to 9 so that no digit repeats in any row, any column, or any of the nine 3x3 boxes. There is exactly one solution.
HOW TO PLAY
- Tap an empty cell, then tap a number to drop it in. Tap that same number again to clear the cell.
- The digits the puzzle starts with are fixed clues. Work out the rest from them.
- Stuck on a cell? Switch to Notes to pencil in the candidates you are weighing, then turn Notes off to place the real answer.
- A digit that breaks a row, column, or box turns red. The grid completes itself once every cell is filled in correctly.