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Robin The Companioncube

After years of being in suspension, you've got a minor case of some serious braindamage. That's why they can't send you to a co-op level, so they made you a companioncube named Robin. Now you can feel like the heroic Batman himself and solve this puzzle with him.

Basicly, this is a singleplayer "co-op" with a partner that actually does what you want him to do ;)