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Shadow Company: Left for Dead
Blade Runner
Dune series
TRON 2.0
Evil Islands with Forgotten In Astrale expansion set
No One Lives Forever series
Star Wars Galactic Battlegrounds Saga
Soldier of Fortune series
whole Pro Pinball series
Shogo: Mobile Armor Division
Theme Hospital
Blood series

and other games available on GOG

PLUS
Fable II
Red Dead Revolver + Redemption
Lost Oddyssey
The Journey
Heavy Rain
maybe Uncharted series

UPlay games, Watchdog in particular.

Diablo franchise (yes even 3)

Heroes III,
Mafia (It got removed for some reason),
Roller Coaster Tycoon 1 or 2,
Theme Hospital

Those for sure, can't think of anything else at this point.

freelancer is by far the one id most like on steam or indeed any virtual platform, and purerly for completeness sake id like GTA london on steam :)

Probably Shadow of the colossus, and Final Fantasy 6,8,9,10

Gears of Wars would be awesome indeed.

Ageod titles.

Need for Speed Underground II, Command & Conquer Generals

Anno 1404 (plus Venice) should be returned..
and theme hospital would be fun

Battle Realms, Gears of Wars

Rayman 1 & 2.

Resident Evil from 1 to 4

Final Fantasy VIII (Hope it will show up soon)

All of them. I'm sick of exclusives and hunting down old games.
I'd happily give you money for something you are already selling, just let it happen. <.<

Freelancer (possibly a HD remake), Bayonetta and Vanquish for PC please!

-Theme park world
-League of Legends

Good ports of Platinum Games' games and Final Fantasy XV.

Hmm.. All the Final Fantasy games that have yet to come to steam. ( I know 8 is in steams database now at least, but still not available for purchase )
Dead Space 3. ( Have it on Origin.. but .. yea.. )
Mass Effect 3.
Battlefield 3.
Shining Force 3. ( of course.. this means the full game would have to be put on PC too.. :P )
Masters of Monsters. ( Genisis version preferred.. would not mind seeing the other versions too though. )
The Suffering games.
The Godfather games.
The Dungeon Keeper games.
Theme Hospital.
Fable II.
Red Dead Revolver + Redemption.
Dead Rising 1, and Dead Rising 3.
Uncharted series.
Heavy Rain.
The Last of us.
Beyond Two Souls.
Dissidia Final Fantasy. ( Though this is basically covered with what I said above already but wanting to mention it specifically anyways :P )
Gears of War games.
Minecraft. ( wont happen I know.. )
Planescape Torment.
Dark Sun games. ( Wake of the Ravager, and Shattered Lands )
Ravenloft.
The old Dune games. ( Forgot its exact name.. as its been a long,long time ago. But there was a RTS game I really liked based off of that stuff. )

A bunch of different VNs like G-senjou no Maou, the rest of the Higurashi VNs ( I know some of it will get on steam thanks to greenlight.. but far as I can tell its not all of it. ) Tsukihime, the Fate series as well ( Fate/Stay,Fate Extra, ect. Yes I know Fate/Extra is not tech a VN but I still want it :P These are just examples.. and would want to see others of course. )

In general would like to see a lot more VNs, as well as JRPGs pop up on steam.

I could probably also add a TON more games that are on consoles but not on PC.. that I would love to see on PC. Might add them later.

Dungeon Keeper 2, Master of Magic, Stonekeep (!!!!!!)

Sure! Diablo collection with working co-op/mp.

Freedom Fighters, Mass Effect 3, Dragon Age 2 and Inquisition, Original Dungeons&Dragons games, The Darkness, All Naruto,One Piece,Bleach and anime games ...

The Settlers series, especially The Settlers 2 - 10th anniversary edition

(Note to self: will have to give Knights and Merchants a try).