XSp.

Pick a Nintendo DS Portable Gaming System, strip the “portable” from it, what do you get?

Yes, the ARCADE DS!
At first I thought “How stupid is that?”, since you’re basically stripping the main feature in which the DS was designed for, how useful would that be.
But then, I watched the video, and thought to myself “Well, this isn’t bad AT ALL!”
Because yes, it’d be absolutely awesome to have an arcade to play Rhythm Tengoku Gold!
Seems a PSP can be rigged to be played in the same way, so it’s a pretty interesting mod.

Source: TechEBlog