I admit, though, if you get frustrated easily, don't try it. What starts out innocent and easy becomes increasingly challenging as the puzzles get bigger and – eventually – downright evil... I just cleared the easy puzzles last week and look forward to making my brain hurt with the next levels. :) I'll let you know if I get too annoyed and end up throwing my phone to the wall, but somehow I can't see it happening. It's too addictive.