According to IGN:
The 3DS is a pretty amazing piece of kit, but there are very few "must see" games at the booth beyond the demos of stereoscopic 3D without the need for glasses. If there was one demo I'd recommend anyone see over everything else, it'd definitely be the demo for Metal Gear Solid: Snake Eater.
The demo, like 90 percent of the 3DS software at the show, is not playable…but it is interactive. Players can move the camera around with the 3DS system's analog slide pad at specific points in the action. The demo is running in realtime, and it shows just how detailed the 3DS visual capabilities can be. This is the first generation of 3DS software, and already it's impressive.
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