BioShock Infinite, the new video game from Ken Levine and his Irrational Games team, is a little more than one month from launch and publisher 2K Games is teaming with Valve to launch an pre-order scheme complete with unlocks on Steam.
Gamers who get the game via the digital distribution service can get access to a number of items for Team Fortress 2 and even to a complete free copy of XCOM: Enemy Unknown, one of the best video games launched during last year.
The first rewards tier, which includes a free copy of the original BioShock, has already been unlocked.
BioShock Infinite is also offered via Green Man Gaming, where players can choose from a number of free titles.
The game takes player to the floating island of Columbia where they play as a detective who is trying to save a girl called Elizabeth, who has supernatural powers.