[H] Inversion key (only for America) [W] 3 ref

Anything here?

Alien Shooter
Alien Shooter 2: Reloaded
Dead Space
Defense Grid
Greed Corp
Just Cause (gift)
Metro 2033
Satazius
Serious Sam HD: The First Encounter
Serious Sam HD: The Second Encounter
Worms Blast
Worms Crazy Golf
Worms Pinball
Zombie Shooter
Zombie Shooter 2

Of course you can take multiple keys.

W: Steam key

• Inversion

H: Steam key(s)

• Arena Wars 2
• Beep
• Coniclysm
• DIVO
• Dungeons: The Dark Lord
• Garshasp: The Monster Slayer
• Garshasp: Temple of the Dragon
• Governor of Poker 2 Premium Edition
• The Polynomial - Space of the music
• Sacraboar