The game 電力会社対助役 (Power Co. vs Mayor) is a postcard game pitting one player representing the power company against the other player who takes on the roll of the mayor.
Players must supply their own components: 1 six-sided dice, 4 cubes, and components to use as money. The game takes place over 4 rounds, each consisting of three phases.
In each of the rounds, the mayor and the power company representative will each have a chance to roll the die, hiding the value, and state a number. Depending upon the other player's choice, one player collects money and the other adjusts the cubes that represent the income of the power plants. Afterwards, the power company collects income.
The postcard shows 4 power plants. In the first round, the player only collects income from the first plant. In the second round, the player collects income from the first and second plant, etc.
The player with the most money after 4 rounds wins.