Players view a grid from a fixed top-down puzzle perspective and fill squares according to the clues for each row and column. A clue number represents a consecutive group of filled squares, with at least one blank square separating separate groups.

The player moves a cursor around the grid, marks suspected filled squares, and can place X marks in squares believed to be empty. Puzzles are organized into stages with different grid sizes and difficulty levels. Completing puzzles advances through the game, while mistakes can trigger a time penalty or reduce the available margin for error.

Start with rows or columns whose clue totals nearly fill the entire line; their placements often force several squares immediately.

Use X marks to record confirmed empty spaces, then cross-check every deduction against both its row and column. When a puzzle becomes uncertain, compare the possible placements of a clue group and fill only the squares shared by all valid placements. Avoid guessing, especially on larger grids where an error can cost valuable time.