I Like the new Fast Zombies! May add some more variants (crouching, walking, running, sprinting) but please not "specials" like in Left for Dead. Also add some "stupidity" into the KI, to enable features like: Zombie runs at a wall and it get knocked back (stunned for a ~second) Fast Zombies will get you after some time (even sprinting will not work for long). But their Line of Sight should easier to break compared to slower ones. Fast Zombies should get a huge disadvantage inside buildings. The Most noticeable problem with the fast Zombies is: they run to your last known position and change the direction after they noticed you are not there anymore -> funny run-in-circles games with zombies^^ To sum up: - Let them run against (not through) walls and may add stun after knocking back - Calculate the running-path more frequently of faster zombies - add a FEW slower Zeds with better senses