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There is apparently a challenge which involves finding 25 Retro Challenges (and beating them all too!)

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Which levels have them, and where can I find them (do I need keys to get there?)

I've found three so far, one on Windy Interlude, one in Cloud 8 1/2, and one in Cloud Nein, but I can't seem to find the rest.

Where are these retro challenges located?

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up vote 1 down vote accepted

Here's a Steam guide that explains most of it:

http://steamcommunity.com/sharedfiles/filedetails/?id=129947407

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