Master of Worlds is an empire-control game using dice and cards in an interplanetary setting. The attributes of worlds are brought under the player's control either by conquest or alliance (war or diplomacy). Each tactic has its rewards or penalties, depending on the values and bonuses of the targeted worlds, and the resources at the players disposal. The game uses oversized cards (4 x 6 inches) with several dice, markers to track the progress of the player's influence on target worlds, and score boards to keep track of cumulative action points available on each turn.