I've got some friends coming over this weekend, and am thinking about asking them to help me complete the four-player/x4 challenges in LittleBigPlanet 2. I still have two worlds to complete to finish the game. The only one I've encountered so far is on The Factory: Bang for Buck. I'd like to know, before my friends arrive, how much further I have to get in the game to open all the 4x challenges.
What levels have four-player challenges?