The pentomino puzzle set is a geometric shape puzzle that comes with 65 challenge shape cards. The player will have a set of 12 puzzle pieces and a challenge card shape that he will be working on. The front of each card shows a shape that you need to form using all 12 pieces and the solution on the back. The puzzle difficulty level will increase when you progress with the challenge cards from 1 (simple) to 65 (advanced - high-level difficulty). Unlike many other puzzles, the pentomino puzzle set allows for endless creativity as you form new shapes!