Each 99¢ (80 Microsoft Points) pack contains two "highly polished and balanced" new levels with a campaign mode, four challenge modes and new achievements. The first pack will be released on June 2, with the other three following weekly on Wednesdays.
The first two maps, 'Height of Confusion' and 'Service Interruption.'
If you haven't already given Defense Grid a whirl, you can nab the 237MB PC demo from FileShack or download the Xbox 360 demo from the Xbox Live Marketplace.
Level descriptions and the complete Resurgence release schedule follow below.
Defense Grid: Resurgence Map Pack 1 - June 2, 2010
Service Interruption and Height of Confusion
Two new challenging Defense Grid environments are the