You have been trying to find the codes like crazy but still cannot find them? Don't worry!! In this text file you can find hints on how to find each one of the codes :), I would suggest you to read this ONLY if you cannot find the codes.

Code 1 (1-Tower): The coins point the way, but you need to be mini to get there

Code 2 (2-A): That brick block looks suspicious, maybe a koopa shell would be helpful

Code 3 (3-2): Find the regular exit in 3-2

Code 4 (3-2): You probably already know that you can jump much higher as mini, I wonder what would happen if you enter the level as mini?...

Code 5 (4-1): Find the regular exit in 4-1

Code 6 (4-1): Same as 1-Tower
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If you still can't find the codes with these hints, I'm sorry but you're stup... just kidding XD, but seriously, search harder :P