Metal Gear Solid 3: Snake Eater HD Edition Cheats

Infinity Face Paint
This really isn't that hard to do once you have the 'spirit' and the 'fire' camo.

Beat the game in under 5 hours: as long as you skip the movies and blah blalh blah this shouldn't be too hard.

0 Alert modes, 0 humans killed: Not too hard either as long as you have the spirit camo.

20 or less serious injuries: This is best done with the 'fire' camo on and NEVER stay still during your boss battles, you'll be an easy target for injuries.

25 or less game saves: Come on, that's not so hard.

No special items used: In other words only use your knife and your MK22 through te entire game. Your sonar and active personel will do wonders for you in the game. No stealth or EZ Gun allowed.

Tip: I would wait till you beat the game once to try to get the Infinity Face Paint. You will have all the camo you need to make you invisible.