Slaughterhouse 500 Challenge

''What is it about zombies taking down helicopters? Kill 500 zombies between you and Union City to unlock the Blood Vial card.''

The Slaughterhouse 500 Challenge was a challenge for the game The Last Stand 2 that was released on July 17th, 2008 and lasted until July 24th, 2008. To complete it, the player had to kill 500 zombies. Completing the challenge would give the player the Replay 1 version of the Blood Vial card.

Triva
The title of the challenge is a reference to the novel Slaughterhouse-Five.