This is how to beat the last level in Little Big Planet, "The Collector." It contains the ending, thus it has a **SPOILER WARNING**. For no spoilers watch from 0:37 - 4:27. Those parts just show the bosses.
Overall, I think LBP is an excellent game with a gay ending. But hey what did you expect, it's E Rated. In my opinion, every PS3 owner should have Little Big Planet.