Customers who pre-order the digital download of "BioShock Infinite" will receive a digital download of "XCOM: Enemy Unknown" for free. Pre-order customers will also receive a $30 credit to use on 2K Games downloads, a free copy of "BioShock Infinite: Mind in Revolt" for Kindle, and the "Industrial Revolution Pack". You will receive an e-mail within two days after the release of the game detailing how to redeem your free download of XCOM: Enemy Unknown. You will also receive an e-mail within two days after the release of the game to notify you that your $30 credit has been delivered. To redeem your credit, simply return and purchase a 2K Games digital download (excluding BioShock Infinite, BioShock Infinite Season Pass, and games available for pre-order), and the discount will be automatically applied. Credit must be used by 3/26/2014, promotion valid once per customer. An e-mail detailing how to redeem your free Kindle book will be e-mailed within two days after placing your pre-order.