Someone doesn't play a lot of games.
Metal Gear (the original stealth game)
Hidden & Dangerous
Manhunt (avoid the 2nd one)
And that's just for starters.
Snake Eater is probably the most involved of the Metal Gear series in terms of gameplay, because you have to wear camoflauge that best conceals you, so you're often switching.
Manhunt 1 is great, although a bit repetitive. Manhunt 2 would've been better if it wasn't so blah.