Some ballyhoo has also been made about the gravity-defying abilities in the single-player game, whereby you'll find energized tracks that let you walk up walls and over ceilings. You'll even be thrown into a number of combat situations with enemies on different planes during the demo, which can be a little disorienting, but it's fairly unique as shooters go. These gravity tracks, coupled with the portals, actually made us feel a little woozy, and we've never had a problem with motion sickness when playing a video game before. If you're prone to such things, consider popping a Dramamine before firing up the game.

The Prey demo will also include two levels from the game's multiplayer mode, which focuses on the old deathmatch standby. There are more weapons available here than in the single-player portion, which features such things as a shotgun-like goo blaster, a gross-looking organic chaingun of sorts, and everyone's favorite, the rocket launcher--or at least, some biomechanical variation thereof. But while the weapons may sound like old hat, Prey deathmatch has a few interesting tricks up its sleeve. One of the maps is literally wallpapered with the gravity-defying illuminated walkways you'll see scattered around the single-player game, meaning that you never know when an opponent is going to come charging down the wall or even across the ceiling at you.