Polyominoes is a challenging and fun game and puzzle. It uses the 12 pentomino pieces and includes over 100 different boards to play on. It includes 4 different games including the basic game where you try to place the last piece on the board, the challenge game where you've provided with a game position and you have to find the winning move (like chess mate-in-x problems), the jigsaw puzzle where you try to fit all the pieces on the board, and the spanning puzzle where you try to place as few pieces on the board so that no more moves are possible.