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Cities of Splendor is a set of four expansions for use with the Splendor base game. Each expansion can be added to the base game but they should be played separately.
The Cities replaces the noble tiles with three different city tiles (randomly taken from a collection of 14). The city tiles are goals (in prestige points and/or development cards) and you need to complete one of them in order to win.
The Trading Posts are unique bonuses you earn by gaining an array of development cards: more prestige points from the 1st noble tile you get, an extra token when you choose the "Take 2 gem tokens of the same color" action, etc.
The Orient adds 3 decks of cards (1 for each level of development cards). They are included on the right side of the regular cards and you place 2 of them face-up on the table for each level. The new cards have unique powers (similar to double bonus cards or joker cards which take the color of one of the developments you already have).
The Strongholds expansion provides each player with three towers (strongholds). When you get a new card, you must put a stronghold on an face-up card on the table. You are now the only person allowed to purchase/reserve it. You can also move one of your strongholds from one card to another card or remove another person's stronghold. When your three strongholds are on the same card, you can purchase it after your regular action, allowing you to make 2 acquisitions in the same turn or buying that card after taking your tokens!