Started out fine, but the "power charge" feature that is required to play each level wouldn't update while the game was off. And each time I opened up the dialog box to "buy" more, it would say "+1 in" random times. Once was 30min, another 45, the next 4, and once was an hour. If my ability to play levels is based on a charger token, it needs to be useful. Otherwise the game is useless.