At the start of the game, i quickly noticed that the music was really, really, annoying, so i muted it. There could have been a seperate mute button for the music/sound, one for each. Once i found the key, i tried getting it from the item menu, nothing there. So i figured i'd click the puzzle pieces menu. Bad idea. Once i did that, i could not de-select the puzzle piece, and i couldn't even move around anymore. Should have been more tested for bugs.