Zombie Panic! Source is a cooperative, survival-horror Half-life 2's first-person-shooter modification! While our main priority is to make the mod as fun to play as possible, ZPS plans to greatly expand on the core features of "Zombie Panic!" for HL1, with the obvious new features, impressive visuals, and of course atmospheric maps. More importantly ZPS will not force players to fend against dumb and predictable AI, but instead keep the same intense thrill of surviving against intelligent and persistent player controlled zombies as the original.
A new map titled ZPO_Corpsington for Zombie Panic: Source