The Mega Millions is an American lottery game which is played in multiple jurisdictions across the country (and indeed, the world), with the first draw taking place in 2002. It also holds the proud title of giving off the third largest recorded lottery win in American history. In March 2012, a $656 million annuity value (cash value $474 million) jackpot was won and split three ways due to three winning tickets.
Unclaimed prizes are kept by the lottery jurisdiction. If a Grand Prize goes unclaimed, the money must be returned to all lotteries in proportion to their sales for the draw run. The lotteries then distribute the money, based on their own jurisdiction's laws, to other lottery games or to their jurisdiction's general fund, or otherwise as required by law.
US Powerball is without a doubt the biggest lottery game in the world! Powerball set a world record when it awarded a $1.58 billion jackpot prize in January 2016 to three lucky winners. Powerball came close to breaking that record when it awarded a $758.7 million jackpot in August 2017. Previous huge jackpots include the $590.5 million jackpot awarded in May 2013 and the $564.1 million prize awarded in February 2015. Play Powerball online right now for the chance to become the next big American lottery winner!

The Mega Millions world record stood until January 2016, when Powerball took over the crown as the lottery champion of the world with a $1.568 billion jackpot. Changes to the Mega Millions game format have made it more difficult to win the Mega Millions jackpot and as a result, Mega Millions could soon award a record-breaking jackpot and regain its title as the biggest lottery in the world.
The two different methods, both offer you, the player, the same user experience and the only difference is in the back end of how the online lottery ticket provider works. The two methods that online lottery sites use differ in one key way; They either have agents and employees all over the world that physically purchase tickets on behalf of clients or, the more recent phenomenon is when companies essentially take out an insurance policy on every ticket which is tied to the size of the jackpot. This is the difference between you playing the lottery online and betting on the lottery online*. In the latter option you are, de facto, not playing the US Powerball online but rather you are placing a bet with an insurance company on the outcome of the corresponding Powerball draw. 
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