Dominoes must be added to a kingdom using the following Connection Rules:
A kingdom may not be more than 5x5 squares in dimension.
When connecting a domino to another domino, horizontally or vertically, at least 2 connecting squares must have the same terrain type (one on each domino).
The 4-sides of the starting tile are wild - any terrain can be connected to them.
Once a domino is in place, it may not be moved.
If a player selects a domino (or is forced to select a domino) that does not fit into their kingdom because it violates the 5x5 dimension rule, or it does not match any available terrain type, it must be discarded from the game. Points are not earned for discarded dominoes. Dominoes cannot be discarded if they can be placed in a kingdom using the above rules.