Patchwork (also known as "Tatami") consists of a square grid divided into regions ("rooms"). Each room must be filled with each of the digits from 1 to the number of cells in the room. Every row and every column must contain the same amount of each digit. Same digits must not be orthogonally adjacent.
In some puzzles letters are used instead of digits. Cross+A can solve such puzzles also.
Cross+A can solve puzzles from