This information may need trimmed to be put on the card. I figured that since on a business card, you're trying to get your name out there, a social game would be a better fit. And what's more social than players eating each other? Nothing!
On the back of the card: A small indicator of zombie or survivor.
If you were just handed this card you are now either a zombie or a survivor. Unfortunately, this isn't a normal zombie outbreak. Zombies look and act like normal people outside of their terrible hunter for your flesh.
Tell no one which of the two you are. As a zombie, your goal is to infect the remaining players. However, you cannot tell who is a zombie or not. If you eat a zombie, you kill one of your own. If a hunter kills a human, they're destroying the human race. Kill or eat a player by tapping their copy of the business card. You must have your card out while playing this game. You'll find out if they're a zombie or a human after you kill them. Mark your human and zombie kills down on the card.
Social interaction between all players, not mindlessly tapping cards, is encouraged.