Monster Hunter Stages
Read all of Chico's briefing files, then go to Extra Ops 29, move to the beach area and encounter the talking cat. This will unlock the first Monster Hunter stage. Play this to unlock more stages.
The director, Hideo Kojima, can be recruited from an interactive cutscene in "The Destination of the Nuclear Warheads" by selecting the truck with the license plate "Centro America 63824 Peace Sentinel".
From the Title Screen, go to Extras > Network > Enter Passcode to enter the following codes. You also need a Playstation Network account.
|Black T-Shirt with White Peace Walker Logo
|Gray T-Shirt with MSF Logo
|Gray T-Shirt with Snake Art at the Back
|Olive T-Shirt with Snake Art