Day of Defeat: Source takes the classic gameplay of the original Day of Defeat and improves the experience with Source, the advanced engine technology Valve created for Half-Life 2. With this technology, DoD: Source offers state of the art graphics (including support for HDR lighting) in optimized versions of popular maps, plus redesigned sound and all new player, weapon, and world models.
Completely updated maps to take full advantage of the Source engine replaces
Integrated physics simulation for ragdolls and physically simulated objects
Higher resolution textures throughout
Bump mapping, specular lighting, and other graphic effects, all powered by advanced Source engine technology
Completely redesigned user interface
All new voice, weapon, and ambient sounds