Painkillers. Seven Days Killing is a zombie game in the new open world, which combines the elements of first-person shooting, terror survival, tower defense and role-playing. In the game, the concussion caused by fighting zombies can be relieved by taking painkillers, or the character's state can be restored by upgrading. In "Seven Days Kill", the player will play a survivor in Arizona, USA, which is the last unpolluted place on earth, and the player will fight for survival.