The "MAY GLITCH" sprites are actually Koopalings (Iggy, Morton, Lemmy, Roy, Wendy, Larry). They must be placed at the correct location to make a Koopa Kid appear. It is easier to see them in Wendy's and Lemmy's rooms - they aren't Mode 7. However, if you place one of those sprites in a normal level, everything may glitch up.

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