Dubbed the "Ranger Pack" and revealed via Facebook, the as-yet-unpriced add-on brings "new weapons, new achievements and the deadly 'Ranger Mode' game rules" along with a "Ranger Hardcore" mode that "adds an additional challenge as the HUD is totally removed, creating the most immersive Metro 2033 experience yet."

Both the PC and Xbox 360 versions of Metro 2033 will receive the add-on "in the very near future," say the companies, with "pricing to be confirmed closer to release."