The numbers beside each row and above each column are the lengths of the runs of filled cells, in order, with at least one empty cell between runs.
Tap or drag to fill cells. Switch to Mark, or right-click, to put an X on cells you know are empty. Filling a wrong cell counts as a mistake and turns into an X.
Every puzzle can be finished by logic alone, no guessing. No mistakes earns three stars; a hint reveals a cell but caps you at two.
Keys: X switch pen · H hint · R clear · M sound · Esc close