In It's on me!, players have ingredient cards for making cocktails and recipes for those cocktails. There is also a common deck of ingredients.
During the game, players have the opportunity to draft ingredients out of the common deck and replace with other cards from their personal ingredient pool.
Players will discard recipe cards and then ingredients are revealed from the common pool. If no players can complete a recipe from their hand, reveal an additional ingredient card. If all players can complete a recipe, then the ingredient deck is adjusted again, and players discard additional recipe cards.
However, if only some people can complete a recipe, those recipes are completed and given to a player who could not make one.
The game ends after a number of rounds or when someone is too drunk - based upon the alcohol content of the drinks which have been placed in front of them. The winner is the least drunk player.