On October 13, 2009, the Mega Millions consortium and Multi-State Lottery Association (MUSL) reached an agreement in principle to cross-sell Mega Millions and Powerball in American lottery jurisdictions, with the two groups referred to as the "Mega Power Lottery" by many users. The expansion occurred on January 31, 2010, as 23 Powerball members began selling Mega Millions tickets for their first drawing on February 2, 2010; likewise, 10 Mega Millions members began selling Powerball tickets for their first drawing the next day. Montana (joining Mega Millions on March 1, 2010) was the first jurisdiction to add either game after the cross-sell expansion. Nebraska (March 20, 2010), Oregon (March 28, 2010), Arizona (April 18, 2010), Maine (May 9, 2010), Colorado and South Dakota (the latter two on May 16, 2010) also have joined Mega Millions since the expansion.
The structure of the draw is one which regular lottery players will be very familiar with; players must pick 5 regular numbers from a pool with a total of 69 numbers and in addition to these regular number picks, you also choose one bonus ball (known as the Powerball) from a pool of 26. These two pools of numbers are mutually exclusive and remain completely separate throughout the drawing procedure. In order to jackpot the US Powerball, you need to match all 5 regular numbers and the Powerball. Do this and you are instant Powerball millionaire – it’s as simple as that!