Metal Gear Solid/Unlockables

These can be unlocked on any difficulty.
 * Alternate ending theme: complete the game three times.
 * Bandana: beat the game with Meryl's ending (beat the torture scene).
 * Boss Survival Mode: beat the game once.
 * Crimson Ninja: beat the game twice.
 * Meryl Demo: complete the game once with Meryl's ending.
 * Meryl Demo 2: beat the game once as Tuxedo Snake while saving Meryl.
 * Ninja save icon: beat the game twice.
 * Otacon Demo: complete the game once with Otacon's ending (submitting into the torture).
 * Otacon Demo 2: beat the game once as Tuxedo Snake while saving Otacon.
 * Sneaking Suit Meryl: beat the game twice.
 * Start with Camera: obtain the Camera and beat the game.
 * Stealth: beat the game with Otacon's ending (submit to the torture).
 * Tuxedo Snake: beat the game two times.

Tips

 * Things to be merged into walkthrough
 * Beat Psycho Mantis: in the Psycho Mantis boss fight, if you switch your controller from port 1 to port 4, he will be unable to read your mind and dodge your bullets.
 * Easy Health Upgrade: when fighting the Ninja in the computer room, go to the top right corner of the room and shoot Mario on top of the computer to replenish your health.