The goal of the game is to have the lowest total points at the end of the game. The goal of each round is to play all the dominoes in your hand. The secondary goal is to not have a lot of points in your hand when somebody else goes out.
The game has 13 rounds. The first round starts with the Double Twelve. The second round starts with Double Eleven. This continues down to Double Zero.
The Hub - This is the centerpiece where all player trains start
The Engine - The starting double that is placed in the center of the hub
Player Train - A players line of dominoes
Mexican Train - A line of dominoes that all players are allowed to play on
Marker - A small train that is placed on your train 
Bone pile - All the facedown dominoes that players can draw from
Out of Play - A place where used word dominoes are placed after they have been used.