I did that too, ha ha ha ha!
This time around, we have Save Editors instead.
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The funny thing is I already forgot how you obtain the stealth gadget.
in MGS3(S), You have to find and shoot all 64 Kerotans (Frogs).
To get all Boss Camo, you have to win with a Non-Lethal victory. (Except The End, you have to sneak up on The End and holding him up (aim at his head and hold it there until he lays on the ground. he will say, "I don't think so" twice then say, "Here, Take this and go." and will drop it along with a Flashbang soon after.)
If you use the Stealth Camo Device and The Spirit Camo (The Sorrow's Camo Can drain Enemies Stamina while CQC choking them and Eliminates Footstep Noise) you will be COMPLETELY Invisible to all.
:D I love me some MGS3 (all of them too, but this is my Favorite beside MGS4/MGO)
EDIT:
**Infinite Abilities - CAMO TIP**
**Achievement Hint** 100% Camo
**Another Achievement Hint** Tsuchinoko
Working on the Last few Achievements for MGS3. Almost got them all on the First Playthrough. Missing a few :D
If you have a save with the Stealth Gadget would you be kind enough to upload it?
I was going to after had gotten it (so far my save has the Infitity Face Camo, Most of the Camos (All Boss Camos), the Patriot, Camera, and a few other stuff.) Thinking of re-doing it on another difficulty
However, I thought I got all the frogs the first time around but I think I either missed one or hit the same one twice, which is why I didn't get it and haven't uploaded my save. (lol I'm a bit of a perfectionist when it comes to my shared stuff)
im actually downloading this now i loved the originals