Introduced today during Nintendo's Treehouse livestream, this is Speed Mario Bros., a hyperactive take on the original Super Mario Bros. that will be included in Ultimate NES Remix, which is out for 3DS on December 5.

It's essentially Super Mario Bros. sped-up like you're holding the frameskip button on an emulator, which will surely lead to all sorts of ridiculous speedruns in the near future. Video above.