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"[7] 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.

Powerball® tickets print the white ball numbers in numerical order of a given play. You can match the white ball numbers in any order of a given play to win a prize. The red Powerball number of a given play on your ticket must match the red Powerball drawn. Each play on a ticket is separately determined; players cannot crisscross play lines on a ticket or combine numbers from other tickets. 


If you are married, unless you are legally separated (i.e., there is a written agreement recognized by a court or a court order), you need to include your spouse as well even if he/she does reside with you and/or will not immigrate with you. Of course, if you are legally divorced or widowed, you no longer have a spouse and you don't have to enter the former spouse information.
In spite of the huge popularity of this lottery draw game it is still an unknown to many that you can buy Powerball tickets online, whether you are in the US or not. To be clear, this doesn’t even mean that you have to be a citizen of the US either. No citizenship & not based in the US? You can still play powerball online and buy lottery tickets online for a number of different lottery draw games. 
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