Lottery officials raised the estimated jackpot, which had been $667 million.
The next drawing will be Friday. If someone wins the jackpot, it would mark the second-largest lottery grand prize in U.S. history.
The record lottery jackpot was a $1.6 billion Powerball prize won in January 2016.
Mega Millions is played in 44 states, Washington, D.C., and the U.S. Virgin Islands.
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