- Each unit has three vials to choose from: one contains poison, one contains antidote, and one contains water.
- Choose one vial to drink and one vial to send to another unit of choice. The remaining vial will be removed from play.
- Units which keep the antidote for themselves must send the poison.
- All vials contain two doses. Once one dose has been taken, the idol who took that dose will be incapable of taking the second.
- Once vials are exchanged, units must drink all vials in their possession.
- Winners will be any units who successfully poison another unit.
- If no unit successfully poisons any other unit besides their own, the game will continue until at least one unit manages to do so.