This file was made to help people not get clashing in their levels, made by "JoeyFireFlower":
8Bit + 16Bit = Avoid. Rarely gets good.
NSMB + Anything Else = Major clashing.
SMB1 + SMB2 = Good, and can sometimes be great.
SMB1 + SMB3 = Good, but can be catastrophic.
SMB1 + SMW = Can turn out okay.
SMB2 + SMB3 = Almost always works out great.
SMB2 + SMW = Avoid. There is major clashage. (Yeah. I said clashage.)
SMB3 + SMW = Okay if used in the right way. Rarely exceeds great.
SMB1 + SMB2 + SMB3 = Actually, this can turn out really good if you use it the right way.
SMB1 + SMB2 or SMB3 + SMW = Avoid. Rarely exceeds great.
SMB2 + SMB3 + SMW = Avoid. Rarely exceeds great.
SMB1 + YI = Only for special blocks.
SMB2 +YI = Only a maybe. Probably won't turn out that good.
SMB3 + YI = No.
SMW + YI = Since SMW is very cartoon-ish, this would actually work good.
SM/LoZ + YI = SM would be a definite no. LoZ would have rare circumstances.
SM and LoZ should never be together or with anything else. It is RARE that this EVER looks good.

NOTE: However, this notepad is just giving you a general idea of what tiles clash what do not,
that doesn't mean you need to follow them, you're free to do whatever you want, but this is just
a general thought of the community.