This is an app assisted game. Ownership of the physical game is necessary to play.
You must survive 4 days by scavenging a new location, exploring the rooms and collecting supply cards to fill your backpack. Listen carefully and used your hand to slam a stack where the top supply card matches the request. If you fail to fill a backpack or overcome the hazards you've encountered by the end of the day, you become a Zombie.
That doesn't mean your game is over, the undead can rise again and win by infecting the most Stragglers! Zombie Slam is played over four rounds with all players acting simultaneously. Each round consists of 10 turns with 4 steps in a turn. There is also an optional phone app to guide the play.