For example, a domino is a polyomino with 2 squares. In Polyominoes, you can use pentominoes, tetrominoes, trominoes, hexominoes, or create a set of your own pieces using the Piece Editor. Polyominoes is really three games in one.
Game mode is a strategy game in which the objective is to put the last piece on the board.
The pieces can be flipped or rotated in any manner. Use any of the 90 different boards, or create one using the Board Editor. In puzzle mode, try to place all the pieces on any of the boards. There is detailed online help and 5 levels of difficulty from beginner to master.