A large-scale modification for the cult action game Half-Life, which turns it into the no less cult shooter DOOM. The mod brings over the core mechanics of the 1993 shooter along with redesigned levels in the Half-Life style.

You take control of Dr. Stan Blaskowitz, a Black Mesa engineer, as he engages in a brutal battle for survival, fighting off hordes of aliens and military personnel, shooting and fighting his way through the most iconic levels.