Power Hour , with its variant Centurion (or Century Club ), is a type of drinking game where every player drinks one shot of beer every minute. Each shot contains 1.5 fluid ounces (US) (45ml), for a total of 90 fl. oz. (2.66 litres, 4.68 Imperial pints) of consumption during the power hour. For purposes of blood alcohol content, this amount of beer is equivalent to 7.5 drinks. In the Centurion variant, beer shots are drunk one per minute for 100 minutes, with a shot size of 35ml, totaling 3.5 litres, 6.16 Imperial pints, or 9.9 drinks. All players that successfully complete the total number of shots without retiring are winners. The game is simple and may appear easy, but players often have difficulty completing it. The rate of alcohol consumption necessary to win either form of this game can depend on weight and other factors. It is the speed of the consumption of alcohol that makes the drunken feeling feel so strong!

In the Midwest and Great Plains regions of the United States, many people play Power Hour during the first hour, starting at midnight, of their 21st birthday. The birthday celebrant attempts to drink 21 shots within the first hour. Several alcohol poisoning deaths related to this activity have led to legislation in Minnesota, North Dakota and Texas.