A crossword done with numbers. Fill every white cell with a digit 1–9.
- Each black cell holds a clue: the number in the top-right is the sum of the white run to its right; the number in the bottom-left is the sum of the run below it.
- Within a single run, digits may not repeat.
- So a run of two summing to 3 must be 1 + 2; a run of two summing to 17 must be 8 + 9.
- Tap a white cell, then a digit. Fill the whole grid correctly, fastest, to win.
