So I am going to quote this whole thread and actually respond to posts instead of telling you guys to check out Gunpoint, Monaco, and The Art of Theft (though you should).

Quote Originally Posted by Pete for President View Post
Tenchu 1/2/3 (awesome ninja stealth)
Deus Ex (HR)
Metal Gear Solid series

I like my stealth games.
I really enjoyed the early Tenchu series to a fault. Man, they were so horrifically ugly, and the voice acting horrid, but there was a solid engine in the game, mechanics to make use of, and even the cheesy story was fun. I loved learning every level and becoming such a bad ass that I could rock each level with just one Poison Rice Ball.

I am entirely unfamiliar with Deus Ex. I do not even know its gameplay.

Metal Gear Solid has always done well in terms of a grand story, a good battle system, and neat stealth mechanics. It got overwrought by the time 4 came around, and no one really liked 2. I loved Snake Eater's camo system and stealth tranq-ing everyone. God, and the battle versus The End was a really cool spin on stealth and combat.

Quote Originally Posted by Mahad View Post
There is only one sneaking game(s) I know well, Assassin's Creed; it's not the whole point, but it's a big point.
This thread should help point out a larger variety of stealth games out for you, so that is good. I did enjoy the whole Ezio trilogy of AC games, because a well-performed assassination brings so much pleasure, and the multiplayer aspect is even a bigger thrill.

Quote Originally Posted by Dr Unne View Post
Quote Originally Posted by Skyblade View Post
Quote Originally Posted by I Took the Red Pill View Post
Everyone who likes stealth games should play Mark of the Ninja. Probably the best game I played in 2013 (though that's not a very long list). Plenty of sneaking, action if you want it, cool kill animations, and tons of awesome ninja gadgets. Picked it up on a whim and could not stop playing it.
I'm glad someone mentioned this. Easily the best stealth game to come out in years.
For sure. I generally hate stealth games, and I loved Mark of the Ninja. Every stealth game should emulate it. It had a clear UI representation of fundamental game mechanics like "how close to an enemy can I get without alerting him?". I liked that combat was optional. The platforming was fun. All-around great game.
I need this game and yearn for it. My budget is (extremely) tight right now though, and it mocks me.

Stealth games that allow you to get around combat or not even about combat are great things. Actually, the three I already mentioned can be entirely stealthy if you want, while two of them allow you to brawl your way through things if that really is your style. That flexibility makes replay a worthwhile pursuit.

Quote Originally Posted by Pike View Post
Deus Ex - I think the original does sneaking a little better than Human Revolution but both are good.
Again, I missed the boat on this. Sad face time.

Quote Originally Posted by Rostum View Post
Thief series!
And I have never played Thief! I have only heard the greatest praise here, and I admit I have a fond spot for oldies, but goodies. I must remember to put these on my Steam wishlist or something.

Quote Originally Posted by Pete for President View Post
And how could we forget the Hitman series?
You can stealth in Hitman, I am told, but I only ever got through it by being a run-and-gunner. Perhaps it is time I re-tried.

Quote Originally Posted by Jiro View Post
Splinter Cell games are alright sometimes too!
I really, really hated the first Splinter Cell. When I played it, I felt it was like a poor man's Metal Gear, and that the stealth mechanic was done badly. If you were not one-hundred percent in the shadows, even if you shot that guy before he turned and looked, and you gun was silenced, they heard you, you were blown, and great, re-try. Ugh.

Quote Originally Posted by Flying Mullet View Post
I've played a "sneaker" in Oblivion and Skyrim.
That is all my War Hammer-wielding, Heavy Armor-wearing Breton does; sneak and hammer. Sneak, hammer, repeat.

Quote Originally Posted by Vyk View Post
Stealth Bastard is a pretty amusing little stealth game. There's a deluxe version on Steam and Desura and stuff. But there's also a free version that's not a lot different if anyone wants to taste test. Gunpoint and Mark of the Ninja were the only other games I was going to mention, but they've already gotten some love
I got this, but instead of stealth, it is more of an action platformer where darkness helps, but does not really seem to lend to the idea of stealth. Maybe I need to get a few more levels in, but that is my initial impression. A well-designed game, though, and very slick.

Oh, so one game I have not played, but have been wondering about for some time is SpyParty, a game for two where one person is a spy at a party, and the second person is a sniper who wants to shoot the spy. That alone tickles my fancy.