Half Life 2: Rave
"Half-Life 2: Rave" is a Half-Life 2: Deathmatch based modification that introduces fast-paced; euphoric trippy gameplay in a rave scene style.
This game is like Albert Hoffman's bike ride; Quake 3 on Acid. High speed adrenaline gameplay with psychedellic maps literally raining drugs. The gameplay revolves the use of drugs to maintain your health and have hippy advantages over other raver's.