Pent-Up is the brother game of SEVEN, Counterplays and Stack-22 by the same designer. It uses the same rules but different pieces. Pent-Up uses 12 pentominoes per player (black and 'ice'). A pentomino is a piece composed of five congruent squares, connected along their edges. There are 12 different pentominoes. Pentominoes are well known in the board game community and lots of games use them. Players alternate turns placing one of their pentominoes according to some simple rules, trying to get the most of their pieces on the topmost layers when the game ends. The rules also include a variant and some puzzles.