GameFly and publisher 2K Games have expanded their partnership for the rental services' "Unlimited PC Play," adding several titles that have high-profile sequels or expansions launching this year. BioShock, Civilization 4 and X-Com: Enforcer are available now for free to members.

"With our upcoming releases of BioShock Infinite, Sid Meier's Civilization V: Gods & Kings and XCOM: Enemy Unknown on the horizon, we're taking this opportunity to introduce or re-introduce fans to these beloved franchises," said 2K Games marketing senior VP Sarah Anderson.

Here's a chance for GameFly members with PCs to check out some of the best PC games available... along with X-Com: Enforcer.