Quick thing, when i try to play with someone, i cant

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Great map! Reminds me of that Mario map that came out a while back. Took us a long while to figure out how to get to Jugg and power. Only gripe I have really is that it's way too big and open, so it takes forever and just ends up being boring a lot of the time. But we still had fun! ^_^ I think I might have to delete this map though... 

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how did you play with two people? cooperative isnt highlighting when i try to click it, everything else works