A puzzle where you try to pack the 12 unique pentominoes into a rectangle that is 6x10, 5x12, 4x15, or 3x20 squares in side. It is hard! The program includes sample solutions for each rectangle, but there are thousands more to discover. Version 1.1.0 features puzzle save (F1) and puzzle restore (F2) commands so that you can save your work at any stage and restore it later to continue work or show a completed puzzle. The other new feature is a 5th puzzle layout that has an 8x8 grid with a 2x2 hole in the middle.