The rules of Castle Risk differ from original Risk in several respects. Each empire has a capital city (of the player's choosing) and once the capital is lost that player is out of the game. In addition, reinforcements are granted at the end of a turn instead of at the beginning (except in the case of the Reinforcements card). This makes fortifying the territory a player has just conquered much easier, but denies that player the opportunity to place the new troops in the best strategic position for the turn about to begin.