Make sure you look -everywhere- just like in all the other MGS games. There's so many hidden things it would take a while for me to tell you all of them. However, two things I will tell you..during briefings you can move the MK II around (the robot thing you see in all the trailers). Make sure you explore every nook and cranny to get some goodies. And yes, like in other MGS games, you can get through the entire game with 0 kills thanks to the pistol and sniper rifle that shoot tranq darts. It works on bosses as well. Lastly..chicks have really, over the top, bouncy ASSS in this game. They're not really big, but if they -breath- those things are jiggling. It's pretty amusing P.S. If you get through the game with 0 kills you get the bandana and if you get through the game with 0 alerts you get the stealth camo. And that really expensive gun that you'll be wondering wtf the point of it is..it has a 1 in 3 chance of doing some really crazy !@#$%^&* (like starting a tornado when you fire it). And..make sure whenever you see x or L1 pop up during a cut scene you're hitting either button. X shows flash backs and L1 shows the view from snakes perspective. That's all I'm saying.