The numbers beside each row and above each column give the lengths of the filled blocks in that line, in order — reading left to right, and top to bottom. A row marked 4 2 has four filled squares together, then at least one empty square, then two more. Fill the right squares and a picture appears; every Ink Gazette nonogram can be finished one line at a time, so you never have to guess and hope. Tapping a square cycles it through filled, crossed out — the mark for a square you know is empty — and blank again; the buttons below the grid swap which of the two comes first. With a mouse you can drag across a run to paint it in one stroke.