Cheat Metal Gear Solid: Subsistence

Demo Theatre: 
Start a new game on Disc 1: Subsistence, then save the game. The Demo Theatre option will now be available on Disc 1: Subsistence at the main menu.

Secret Theatre: 
Start a new game on Disc 1: Subsistence, then save the game. The Secret Theatre option will now be available on Disc 2: Persistence at the main menu.