Get one of the games listed below for free, here are the instructions.
- Tom Clancy’s Splinter Cell: Double Agent
- Prince of Persia: The Warrior Within
- Silent Hunter 4: Gold Edition
- Heroes of Might and Magic V: Gold Edition
- Tom Clancy’s Rainbow Six: Lockdown
- The Settlers: Heritage of Kings Anno 1503: Gold Edition
- Rayman 3: Hoodlum Havoc
- Driver 4: Parallel Lines
Those games can’t be registered on Steam.