Last year's tower defense style game for Xbox Live, PSN, and PC sold over one million copies, the publisher confirmed.

Speaking in a new interview with Joystiq, Reverb Publishing CEO Doug Kennedy said "It is tremendously successful franchise. We have lots of plans to support it both with DLC and additional add-ons for the franchise."

The game currently has three more planned DLC packs across all platforms in addition to "The Lost Eternia Shards: Mistymire Forest," which released in late December.

[Source: Joystiq]