The odds are long — 1 in 258,890,850, in fact — but buying a Mega Millions ticket Tuesday could be worth $400 million.
Tuesday night's potential jackpot would be the sixth-largest lottery prize in U.S. history.
If a single player matches all six numbers, the winner would have the option of taking a $224 million lump-sum prize.
Mega Millions changed its rules in October to help increase jackpots by lengthening the odds of winning the top prize.
If no one hits on all six numbers, the jackpot rolls over to Friday's drawing and a grand prize that would start marching toward $500 million.
A $425 million Powerball jackpot from February has yet to be claimed despite the winning numbers matching a ticket sold in Milpitas, Calif.