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Bugs in Rations:
In some portions of the game you'll see little sea mites on the floor. If you have to crawl through the mites they'll sometimes get on your character, and start eating your rations. If you leave them there long enough you'll lose rations--to get rid of them, open your item select menu and quickly cycle through it, going back and forth past the rations. The sea mite will be "shaken" off, saving your food.

Get Boss Survival Mode:
Finish Sons of Liberty using any difficulty setting.

Get Casting Theatre Option:
Finish Sons of Liberty using any difficulty setting.

Get European Extreme Difficulty:
Finish the game using normal difficulty setting.

Get Metal gear Solid 1 Snake:
Finish 100% of missions using Pliskin, Snake, Tuxedo Snake, Raiden X, Raiden and ninja Raiden.

Get Ninja Raiden:
Finish 50% of the VR Missions as Raiden.

Get Pliskin.:
Finish 50% of the VR Missions as Snake.

Get Raiden X:
Finish 100% of the VR Missions as Raiden and ninja Raiden.

Get Stealth & Bandanna:
Finish the tanker missions 3 different times using 3 different difficulty settings on the same save file.

Get Stealth & Wig:
Finish the plant missions 3 different times using 3 different difficulty settings on the same save file.

Get Sunglasses for Snake & Raiden:
Finish the game two times.

Get Tuxedo Snake:
Finish 100% of the VR Missions as Pliskin.

Title Screen Fun:
Press white to hear a gunshot & press Right Analog stick to change colors.