New stages

[Koopaul]

Eh I don't know. Mario Clash is from a time Nintendo would like to forget. That kind of stage is too obscure. Let's think about these stages first.

They can't just be some place we think "would be cool"

I looked at the pattern of stage choices from the Smash Bros series and they are either:

A: Based off a iconic location that represents the series as a whole. (Yoshi's Island, Jungle Japes, etc)
B: Based off a location from the last major game (Great Bay from Majora's Mask and Delfino Plaza from Sunshine)
C: Made up location that represents the series. (Poke Floats, Lylat Cruise)

Never have I seen a stage chosen without historical or recent significance.