Nonozle is a game where you solve puzzles by filling in pixels to form an image. This style of puzzle is called a nonogram.

Every row and column of a nonogram has one or more number hints attached to it, and each number represents a contiguous group of filled in pixels. Using these hints, you can figure out which squares should be filled in and which ones should be blank, and thus fill in the puzzle one step at a time until it forms a complete image.