Sure, it's from a PSP game, but we can all admit that, aside from that small flaw, this video is pretty sweet. Apparently, this PSP game lets you create and download custom stages. From the looks of this recreation of 1-1 in Super Mario Bros., we're sure there are plenty of other sweet homages to other iconic gaming levels available for it, as well. Of course, the only problem with this user-created stage is that it lacks the music from the original Super Mario Bros. game. But, that's to be expected.
Someone let us know when there's a user-created stage that is modeled after the introductory level in Castlevania.