XCOM: Enemy Unknown Steam pre-orders will progressively unlock rewards

XCOM: Enemy Unknown is now available for pre-order on Steam, and comes with some sweet bonuses - as long as enough people get on board.

Firaxis and 2K are offering three tiers of rewards for those who pre-order on Steam, with each tier unlocked by a set number of purchases.

The first reward is an Elite Soldier Pack - a classic XCOM soldier, soldier deco packs and complete color customization option.

The second is a cross-promotional affair, awarding three items for Team Fortress 2 - crafty hair, a Badlands alien skin for the Pyro and a Vigilant pin. Finally, the third reward is a free copy of Civilization 5.

It's not clear how many pre-orders are required for each step, but the gauge currently sits at just 9% so go ahead and bully your friends into buying; assuage your consumer guilt by telling yourself you're building a ready-made multiplayer community.

Visit Steam to pre-order and check the recently-release system requirements. XCOM: Enemy Unknown will also launch on PlayStation 3 and Xbox 360, on October 11.

Thanks, Ausgamers.