There are two different ways to obtain the Stealth Camouflage in Metal Gear Solid 3: Snake Eater or Subsistence (doesn't matter which one).
1) Shoot all the Kerotans (frogs)
I don't recommend this one. Although less time consuming, finding all these can be difficult as they blend in with the environment. And some are difficult to hit. Like when EVA and Snake are riding on the motorcycle.
2) No Alerts
This one is by far easier. You have infinite saves and can restart anytime you want. Hardest place to sneak is Escaping Grozny Grad.
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Do not fail in the torture sequence...when you beat the game and start a new one the stealth camo shld be in raiden's inventory
my official guide says that you have to obtain the big boss emblem
Metal Gear Solid 4 is the best stealth game on ps3, because of his amazing video quality as well, and great story line!
Metal gear (MSX) came out in 1990 Metal Gear Solid (PSOne) came out 1994