Each puzzle is shown as a grid with numbered clues along its rows and columns. A clue indicates the length of a consecutive block of filled squares; multiple clues must be separated by at least one blank square. The player moves a cursor around the grid and marks cells as filled or crossed out.

Puzzles are solved through deduction rather than timed action. Correctly completing a grid reveals a picture, while mistakes can be identified through the game's checking rules. The game is organized as a progression of increasingly complex puzzles, with larger grids and less immediately obvious solutions appearing as the player advances.

Begin with rows or columns whose clues account for nearly the entire line. When a clue can occupy only one position, fill those guaranteed cells first.

Mark confirmed empty cells with crosses and use them to separate clue groups. Recheck both directions after every deduction, and avoid guessing until all forced placements have been exhausted.