The Expansion Pack for Fzzzt adds material for a 5th and a 6th player and 8 cards for the conveyor belt deck. So the exansions consists of: 4 starting cards for the 5th player 4 starting cards for the 6th player 8 conveyor belt deck cards: 2 production units, 1 Fzzzt, 1 robot upgrade, 4 robot cards In a 5-6 player game there are only 4 auction rounds instead of 5 (12 cards in the conveyor belt rather than 8 in the standard game) In a 2-4 player game one can choose a longer game (6 auction rounds instead of 5) by adding the 8 additional cards to the conveyor belt deck. There are no important changes in the rules.