Check out the launch trailer for The World Ends With You: Solo Remix, released today on iOS.
There's also a pile of screens on Andriasang.
The World Ends With You originally released for DS in 2007 in Japan and 2008 internationally. It's something of a cult favourite and while you might be able to grab a copy on the cheap, a quick check of major game traders near me has the cart going for about $22. A dilemma.