This is the 6th addition to the game of Dominion. It adds 26 new Kingdom cards to Dominion including 20 Actions 3 Treasures 3 Victory cards and 3 Reactions. The central theme is cards that do something immediately when you buy them or gain them. Dominion: Hinterlands is an expansion and cannot be played by itself; to play with it you need Dominion or a standalone expansion to Dominion (e.g. Dominion: Intrigue). Those provide the Basic cards you need to play (Treasure Victory and Curse cards) as well as the full rules for setup and gameplay. Dominion: Hinterlands can also be combined with any other Dominion expansions you have.