You probably saw a custom level where Mario had to deal with those SKETCHY MUSHROOM MECHANICS. If you didn't know how to play it, well it's a GOOD DAY for ya, because i remade in SMM play, NOW!
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I don't play SMM but if I understand, you remade a SMM level on SMM? Are there tutorials or was this uploaded before the servers were shut down and you provide it again for Pretendo?