Fill every white cell with a number from 1 to 9. Each shaded clue is the sum its row or column must add up to.
- Tap a white cell, then tap a number on the pad or type it on your keyboard.
- The clue in a shaded cell is the total for the white cells right next to it in that row or column.
- The same number can't appear twice in that row or column.
- When a row or column is full and its sum is wrong, those cells turn red.
