waves of zombies in the l4d style

  1. Randomise their location at spawn time; have several spawners distributed manually in the nooks and crannies the player can’t see; spawn zombies behind doors or windows that swing open and spew the dead out, rooftops, vents, grates

  2. as above or spawn them behind the player / behind an obstacle they’re looking at / distract the player with light / colour / sound so they turn away