Just saw this little video, people are making RPGs, twin-stick shooters, etc with the LBP2 editor. Levels get made with their own custom intro sequence and everything. Wow it's pretty intense.

Shows you what modding can do for a game :) or what games can do with modding :)
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(I'm actually really surprised how far they took the level editing and how much focus they gave it. The first Little Big Planet was impressive. This looks awesome.)