Summary: As others have noted, there is a timer. You have to complete a level within a certain amount of time. If you fail, you have to go back to the beginning of that level and replay it. This is true even in "easy" mode. There is no manual save. If you play for awhile and have to quit before you complete a level, all progress within that level is lost. The game is inventive, cute and fun, even for adults, but the timer aspect and lack of manual save are irritating.