Square Jam is a logic puzzle. A rectangular or square grid contains numbers in some cells. The aim is to divide the grid into square regions. A cell with a number indicates the side length of a region. A region may contain any amount of numbered cells. The grid may contain regions without numbers. A grid dot must not be shared by the corners of four regions.
Cross+A can solve puzzles from 3 x 3 to 30 x 30.