Superhot, the time-stuttering shooter, is now in Quake. Stand motionless, and everything is a black and white and red still life. Move, and the world of Quake erupts around you in gunfire, grenades, and rockets. Each level becomes a staccato puzzle of violence. Do you sprint forward and damn the monsters, or creep up to see the slow-motion firefights? “Superqot” is a free download on the Superhot site.