From the Publisher's web site: This is the fourth expansion to the popular Beer & Pretzel’s Game Starfight. This expansion features a mighty doomsday machine called the Death Cube. This is not a game itself, you need the Starfight© base rules and the expansions II and III in order to use this expansion. This PDF contains: •A rulesheet •A Death Cube sheet •A Death Cube counter •A Death Cube screen The Death Cube must be faced by four ships and it features a new weapon: the assimilation ray! Beware, You'll need even more dice! Expands: Starfight