Mass Effect 2's critical success has thus far turned into commercial success as well. According to EA, the game's initial shipment figures on the Xbox 360 and PC hit 2 million.
One way EA has been fueling those sales is by offering free add-on content to those who purchase new copies of the game through the Cerberus Network. Having released the first batch of extra content as a day-one download, BioWare said this week that the next add-on pack, titled Firewalker, will be available in late March. Those who picked up a used copy of Mass Effect 2 can access the new content by downloading the Cerberus Network for $15.
The Firewalker pack introduces the Hammerhead hovertank, which effectively replaces the all-terrain Mako seen in the original Mass Effect. Players will be able to run the Hammerhead through its paces in five all-new missions catered toward the vehicle. As for future additions to the game, BioWare said Mass Effect 2 will also be getting a new heavy weapon, which BioWare intends to unveil "very soon."
For more information, check out GameSpot's previous coverage of Mass Effect 2.