10 cheat codes for Metal Gear Solid on PS1.
Survive the torture without submitting - Meryl lives, and Meryl gives you the Bandana in her cell. Infinite ammo on the next playthrough (same save).
Endure the Ocelot torture (press SELECT repeatedly, don't submit)Complete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
Submitting ends the torture - Otacon lives, and he gives you his Stealth Camo prototype in the cell. Guards and most cameras can't see you on the next playthrough (same save).
Submit to the Ocelot torture (give up, don't press SELECT)Complete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
Beat the game once with each ending (Meryl's and Otacon's), keep both clears on the same save slot - Snake wears a tuxedo on the third playthrough.
Beat the game TWICE with different endings, saved on the same slotComplete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
On the third playthrough, find the Digital Camera in the Armory South - take photos of the Sorrow's ghosts (and other hidden ghosts).
Beat the game a second time (any endings)Complete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
Watch all cutscenes from the main menu.
Beat the game once; both endings for the full setComplete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
Hard difficulty with no radar.
Beat the game onceComplete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
Cyborg Ninja appears with a red color scheme after three clears on the same save.
Beat the game three timesComplete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
Changes the title screen background color (green/blue/red).
Press Up/Down/Left/Right on the title screenComplete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
PC port: launch with -cheatenable, then in-game: Backspace+0..9 spawn weapons/items, F2 restores health, F4 = infinite ammo in certain areas, F5/F6 camera modes, F7 restarts the level with your items.
mgsi.exe -cheatenableComplete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.
Clear the game, SAVE, then load that cleared save to start the next playthrough with the Bandana / Stealth / Tuxedo unlocks. The torture choice (submit vs endure) decides which gift - Otacon's Stealth or Meryl's Bandana - you get that run.
Complete the listed condition in-game; the unlock carries over on the same save / next playthrough. The PC version also supports -cheatenable hotkeys.