sounds like a card game that i used to play with my frens on
"loser drinks" basis.
let's say got 10 ppl, we take 10 cards with 1 Ace(the killer), 1
king(1 police) and the rest other cards.
so shuffle and give everyone card, only the person himself knows
what card he holding. But for police, once you get the King, you
declare you are police.
The killer - wink secretly to other person to "kill" them. Once you
died, turn over your card and declare you got killed, have a delay
before declaring, so the police harder to catch. depending on how
many person playing, you set let's say once he killed 3person
without being caught, the policeman lose. (because you cant expect
him to kill everyone else except the policeman. )
The policeman - look at others and see who is the killer. Got one
chance to catch. If catch wrongly, drink. If catch correctly, the
killer drink.
ppl other than killer and police dont have to drink.