A Kakuro puzzle: black clue cells tell you what each run
must add up to — the number at the top-right is the
sum of the run to its right, the number at the bottom-left
is the sum of the run below it. Drag tiles 1–9 into
the white squares — or tap a tile, then tap a square
— and make every run add up. No digit twice in a run.
Any fill that adds up wins. Tiles 1–9 are always
available — tap a number you placed to clear it.
Easy is a 6×6 grid with a quarter of the numbers
shown, Medium is 8×8 with a tenth shown, Hard is
10×10 with none shown.