Thus far I've only played the Numbers section, starting with Level 1. This app was a nice mental exercise and fun until I reached Level 130, which seems to be unsolvable. I could skip over it, but the prospect that any level may not have a solution has put me off. Too bad. Otherwise Amazing Matchstick is a nice game. And useful if you ever play this game with toothpicks or real matchsticks.
If anyone knows the solution to Numbers Level 130 ("5 - 1 = 4", move 2 matchsticks), please let me know -- at least that it is solvable. Until then, I think that the programmer accidentally STARTED this particular puzzle with the solution!