I agree with hedwig. Also, unlockable content is not the same as easter eggs. Just thought I'd clarify for you. While easter eggs are secret, not all secrets are easter eggs. I don't think the idea of unlockables is all that great. I don't like the idea of being forced to play things to get features. For an FPS, I think that's a silly way to give the game more replayability. It's different with a fighter game like Soul Calibur, because with fighters, you don't have much to work with, so you have to come up with tricky (almost underhanded) ways of making the player want to play again. Downloadable content on the other hand is awesome. Usually it comes out after you've become quite familiar with the game as it stands, and it enhances the flavor of the game without forcing you to play a certain way. I believe that's a better alternative to unlockables.