Zombies is a blast. I wish more people were playing. It really needs 4 players at a time, but if you hit it just right, you'll love it. N.O.V.A. is a lot of fun. Very similar to Halo. Again, needs more people on multiplayer but the single player is still a lot of fun. I'd agree with the post above me about Mirror's Edge. It was fun, but probably not worth 12.99. I'd say wait until they drop it to 6.99. I've played Sandstorm on my Palm Pre. I enjoyed it a lot. Much in the same vein as Call of Duty on a platform? (Meaning gameplay, not graphic quality.) Best of luck.