One number-crossword a day. Keep the streak.
Fill every white square with a digit 1–9. Each dark square is a target sum for a run of white squares:
the number in the bottom-left is the sum going right; the top-right number is the sum going down.
A digit can repeat elsewhere in the grid, but never twice in the same run.
Shaded squares are given — your starting point. Every puzzle can be solved by reasoning alone; you never need to guess.
✏️ Notes pencils in candidates — switch it on, tap digits to add or remove marks. (Keyboard: hold Shift for a quick mark, N to toggle.)
Every puzzle is verified solvable by pure logic — no guessing required.