I started with original free which let u repeat, randomly, any of the 10 puzzles. That was good b/c u could challenge urself 2 improve ur score. Then I downloaded update. Now u can work multiple puzzles w/o having to finish 1 first. That was good. However, once you have completed the 15 puzzles, some of which are part of the original 10, u cannot redo any of the puzzles. Now if u want to play anymore u got 2 buy game. That stinks!