https://support.steampowered.com/kb_article.php?ref=7480-wusf-3601

WHICH RETAIL CD KEYS ARE ACCEPTED ON STEAM?

All retail Valve games and a number of third-party games can be registered to your Steam account. All of the following games can be registered through Steam:
Valve CD Keys in this format: ####-#####-####
Valve CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
AI War CD Keys in various formats
Alpha Prime CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Audiosurf CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Call of Duty: Modern Warfare 2 CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Call of Duty 4: Modern Warfare is not accepted on Steam
Cricket Revolution CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Dark Messiah CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Dark Messiah CD Keys may also have been printed incorrectly, please see the Dark Messiah article
Dawn of War Soulstorm CD Keys in this format: 1AB2-3FGH-456I-K8LM-OP9Q
Dawn of War II CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Defense Grid CD Keys in this format (Direct2Drive only): 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Empire: Total War CD Keys in this format: 1AB2C-DDEFGH3-IJK4L-MNOPQ-RST56
F.E.A.R. 2: Project Origin CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Football Manager 2009 CD Keys in this format: 1AB2CD3FGH456I7JK8LMNOP9Q
Football Manager 2010 CD Keys in this format: 1AB2CD3FGH456I7JK8LMNOP9Q
GTI Racing CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
GTR Evolution CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Killing Floor CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
The Last Remnant CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Lost Planet: Extreme Condition CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Lost Planet: Colonies Edition is not accepted on Steam
MLB Front Office Manager CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
NBA 2K9 CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Order of War CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Prey CD Keys in this format: AAB1BB2C345CDD6E E7
RACE - the WTCC Game CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
RACE 07 CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Ragdoll Kung Fu CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Railworks CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Red Orchestra CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Rogue Warrior CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
SiN Episodes: Emergence CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Saint's Row 2 CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Shattered Horizon CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
The Ship CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Silent Hill Homecoming CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Speedball 2 - Tournament in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Star Trek: D-A-C CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
STCC - The Game CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Unreal Tournament 3 CD Keys in this format: 1AB2-3FGH-456I-K8LM
Velvet Assassin CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Worldwide Soccer Manager 2009 CD Keys in this format: 1AB2C-D3FGH-456I7-JK8LM-NOP9Q
Opposing Force CD-keys cannot be registered through Steam. Opposing Force was included in a retail Half-Life package. The Half-Life CD-key included in the package will unlock all of the games in that package, including Opposing Force.
Note: Only the retail third-party games listed above can be registered through Steam. No other third-party games can be registered and downloaded using Steam.

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"Loyalty Promo grants a discount off Call of Pripyat if you already own the Steam Version of S.T.A.L.K.E.R. Clear Sky or S.T.A.L.K.E.R. Shadow of Chernobyl. "

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