12th spot

A game not played in the gambling houses, but rather the inns and taverns of Acilas. So named for the goal of the game, to get 12 spots of a set of dice.
The rules of the game are simple. Two six sided dice are rolled and the results summed with the goal of reaching a total of 12. It should be noted that a 1 can be used as either a 1 or a 7.
The game is played against a house who plays hiding one dice and it being bet against. This house player changes every set.