A slot machine includes a display device, reels, a bet unit, motors, a memory, and a controller. The controller is configured to: (a) execute a lottery in response to an accepted bet; (b) send a signal indicating an instruction for rotating each reel to each motor; (c) determine an amount of credits to be awarded to a player in accordance with the lottery result; (d) determine an image to be displayed on the display device in accordance with a proportion of the amount of credits to the accepted bet; (e) cause the display device to display the image determined in (d); (f) send a signal indicating an instruction for causing each reel to come to a stop to each motor in accordance with the lottery result; and (g) when each reel comes to a stop, award the amount of credits determined in (c) to the player.