Have I played all of the stealth games?!!!!!!!!!!

I had some fun with Death to Spies time ago. You could try that.

How did you not play Metro 2033 and Metro: Last Light yet? :P
They're one of the most awesome stealth games I ever played.

Games tagged with "Stealth" on Steam. Don't know if that's any help to you (or even accurate).

Crysis 1-3 (you can play almost all the time stealthly if you want), Sniper: Ghost Warrior (stealth most of the time), and some horror games, such as Penumbra and/or Amnesia. Yeah those are the only ones I can think right now, and also, if there is a game that is everything but a stealth game is Just Cause 2.

Edit: If you're old school you could try the Syphon Filter games for PS1. Those are AWESOME! There's also 007, wich is kinda cool depending the one you get. I recommend Everything or Nothing.

Ghost recon future soldier (need team work XD)

Dynamite Jack, Thief 1-3, and Deus Ex: The Fall. This got a pc version recently and on steam. Not out yet though.

The Walking Dead: Survival Instinct is a stealth game. And it did recently get a sale, so can be had for around 3 keys if you do trading.

You should also look into the Tenchu and Shinobido games on consoles.

Don't forget the awesome Manhunt 1 and 2.

Have a nice day :)

Monaco is a great stealth game, with a co op :3

also Warp

Alpha Protocol is really good and you can play as a stealthy agent.

Velvet Assassin

you're missing Assassins creed Revelations.

Is Far Cry 2 even a stealth game? You cant even melee kill an enemy silently.

Anyway, you can try to do Fallout and Elder Scrolls in stealth.

How do you play JC2 stealth?

You're missing on Alpha Protocol, it's really good. Metro 2033 has some stealth elements to it, but doesn't work well. Regardless it is a good game. Metro Last Light has much better and actually working stealth.

Fallout could be played stealthily. Just.. stay away from 3. If you're going to try that, go straight for New Vegas.

Also Payday 2 if you're into multiplayer stealth

Splinter Cell Double Agent and Conviction (I don't think those are included in the HD Collection).
The original Thief trilogy.
Dark Messiah of Might and Magic.

Try Crysis 3 on the "post-human warrior" difficulty and it's nothing but stealth.

Tenchu is rather large stealth series. Also freeware Trilby - Art of theft is really good and similar to Gunpoint.

Team Fortress 2. Use spy and take out medics and sentry nests.

Manhunt 1 and 2.
Rainbow Six 1 to 3.
Ghost Recon, all of them.
Commandos 1 to 3
Crysis 1 to 3.
EYE Divine Cybermancy.
Chronicles of Riddick: Escape from Butcher Bay.
Fallout 1 to New Vegas.
*The old Thief games.

Trilby: The Art of Theft is very good. I suspect that it was a major inspiration for Gunpoint.

You should also try the first three Thief games.

Deus Ex allows many different play styles, but treating it as a stealth game is very satisfying.

The Commandos series of games is also worth playing. It's a tactical game where you coordinate several specialised soldiers to infiltrate nazi military bases and such. Have your diver emerge from a river here and open a gate so your driver can take a truck through it. A guard will come to stop and inspect the truck but your green beret was hiding underneath the snow and silently kills the guard with his knife as he passes, so your spy can take the guard's uniform... sort of thing. It's a stealth game about pulling off Hannibal Smith plans.

Older thiefs and deus exes?

Monaco
System Shock 2
Deity is an interesting short/little free game on Desura that you might like

...and if you like stealth, maybe you like anti-stealth, too

Revelations and Black Flag ;___;