Green like cash.
Wario Forums
Yellow Pyoro
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I might be stupid because I never realized his shoes in WL4 were purple. I assume that's a limitation thing when it comes to the GBA. Makes me imagine he's pretty much just wearing socks around the pyramid lmao
Hotel Horror
They always looked like footie pajamas to me 
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I can definitely see that too. Was Wario expecting to spend the night before he got trapped inside the pyramid? Haha