Product Description This expansion can only be played with a copy of Power Grid. The game rules for Power Grid are the same. This expansion includes components and rules for adding robot players to the game. From the Manufacturer With this expansion, Power Grid is an exciting and fun experience for 2 players. The robot acts as an additional player. Thanks to his different actions and special abilities, he is a strong opponent. The players manage the robot's decisions, and can use him to act against the other player(s). Players can use the robots with up to 5 human players, as well, or use more than one robot in a single game. When playing with 2 players, just give each player a robot and enjoy a very interesting 4-player experience.