The following is a list of games that can be activated on Steam, even if bought elsewhere. Before purchasing, be sure to check the version you are buying is indeed able to be activated on Steam.
A
- A Game of Thrones – Genesis
- Alien Breed: Impact
- Alien Breed 2: Assault
- Alien Breed 3: Descent
- Alien Breed: Trilogy
- Aliens vs Predator
- Alpha Protocol
- APOX
C
- Call of Juarez: The Cartel
D
- Dead Island
- Deus Ex: Human Revolution (Augmented Edition too)
- Dreamcast Collection
- Drive a Steam Train
- Duke Nukem Forever
- Dungeon Siege III
- Dwarfs!?
E
- Empire: Total War
- Empire and Napoleon: Total War – Game of the Year Edition
F
- F.E.A.R. 3
- Football Manager 2011
I
- IL-2 Sturmovik: Cliffs of Dover
J
- Just Cause 2
K
- Kane and Lynch 2: Dog Days
- Killing Floor
L
- Lara Croft And The Guardian Of Light
M
- Mafia II (+ expansions)
- Magicka (+ expansions)
- Medieval II: Total War Gold Edition
- Might and Magic: Clash of Heroes (+ expansions)
N
- Napoleon: Total War
- Nuclear Dawn
O
- Order of War
P
- Post Apocalyptic Mayhem
R
- RailWorks 2 Train Simulator (expansions)
- Railworks 3: Train Simulator 2012
- Red Orchestra 2 (Deluxe edition too)
- Renegade Ops
- Rome: Total War Gold Edition
- R.U.S.E.
S
- Sanctum
- Sid Meier’s Civilization® V
- STORM: Frontline Nation
- Stronghold 3
- Stronghold 3
- Super Meat Boy
T
- The Ball
- The Kings’ Crusade
- Total War: Shogun 2 (+ expansions)
W
- Wasteland Angel
- Woody Two-Legs: Attack of the Zombie Pirates
- Worms Reloaded
