Nonograms are picture logic puzzles in which cells in a grid have to be colored or left blank according to numbers given at the side of the grid. To complete a level, you have to guess which cells must be colored or be left blank. The numbers on the rows and columns show how many cells you have to color. If there is more that just one number, it means that there are more groups of colored cells and there must be at least one blank space between them. Nonograms are also known as Hanjie, Paint by Numbers, Picross, Griddlers, and Pic-a-Pix.