METAL GEAR SOLID UNLOCKABLES
Technical demonstration mode
Finish the following modes in order "Training", "Time Trial", "Gun Shooting", "Survival". REMEMBER: Completing each mode will unlock the next mode in the sequence. "Technical demonstration" mode will now be unlocked. Use it to watch the CPU demonstrate its best time with the gun.
Alternate ending and music
Finish the game with the Tuxedo costume.
Bandana
Finish the game without submitting to the torture. Your character will save Meryl and receive the Bandana. When equipped, the bandana will allow unlimited ammunition on any weapon.
Alternate costumes
Finish the game, wait until the credits end, and save the game. Load the saved game file and play through the game again. After successfully completing the game a second time, wait until the credits end, and save the game. Load the saved game and play through the game again. Snake will change into a tuxedo in the elevator during this game.
Stealth Gear and Bandana
Finish the game in normal mode after submitting to the torture sequence. Wait through the end credits. A short FMV sequence showing Snake and Emerich getting on a snowmobile will begin. Snake and Emerich will talk for awhile, then Emerich will give him the Stealth Gear. Wait for the score and skill rating screen to appear. Save the game, turn off the PlayStation, then reload the game that was saved. You will start at the first level (dock) and now have the Stealth Gear. You should now not submit to the torture sequence so you can save Meryl and get both the Bandana and Stealth Gear.
Red Grey Fox
Get to Grey Fox while dressed in the tuxedo.