Putrefaction (Steam key/Region free)

Putrefaction is a first person Shooter with elements of horror, which is inspired by old-school shooters like Quake or Duma.
Features
1) a Bunch of weapons, monsters and meat
2) Complicated non-linear levels
3) Secrets
4) Huge bosses
5) Two game modes - Campaign and survival

ACTIVATION INSTRUCTIONS:

1. You need to download and install Steam http://steampowered.com/download/SteamInstall.msi
2. Go to your account or register a new one.
3. Go to "My games" and select "Activate via Steam...", and enter a key received after payment.