Dr. Mario, Swapnote Stage Data Found In Super Smash Bros.

Game files unearthed by a hacker suggest Dr. Mario, Brain Age and Swapnote stages — and a Rhythm Heaven fighter — may have been cut from Super Smash Bros.

[kirbyu]

Why would Swapnote be a stage on the Wii U version, not the 3DS version?

[nintendo_fan_4life]

It wouldn't. A Swapnote stage would have been on the 3DS version.