Steamworks will give provide "auto-updating, Steam Achievements, Steam support for in-game DLC, and more" while requiring Metro 2033 be played through Steam.
Based on the novel by Dmitry Glukhovsky, Metro 2033 is a moody shooter with RPG elements set in the subways and surface of a frozen post-apocalyptic Moscow.
Metro 2033 arrives for PC and Xbox 360 on March 16 in North America followed by a European launch on March 19, packing DirectX 11 features on PC. THQ is offering a free copy of space asshole simulator Red Faction Guerrila with pre-orders on Steam.
Digital distributors Impulse, GamersGate and Direct2Drive are unsurprisingly not offering Metro 2033. The three publicly aired their discontent with Modern Warfare 2's use of Steamworks, griping that it would require they also distribute their competitors's sales platform--which led D2D to describe Steamworks as a "Trojan Horse."