The puzzle does allow for easy modifications. The default settings are 67 piece classic shapes. However, you can change the number and types of puzzle shapes by selecting the SHAPES box. If you wish to start over, you can shuffle for a new game by selecting the SHUFFLE box. And if you get completely frustrated, you can have the computer solve it for you by selecting the SOLVE box.
The game is timed, so you can test yourself with all the different variables. After you have mastered this puzzle, you may want to play some of the other games available at Lesbian Worlds.