The Mega Millions jackpot is an estimated 400-million dollars heading into tonight's drawing.
That's the third highest jackpot in the game's history and the sixth largest lotto jackpot ever in the U.S.
If all that cash is going to be yours, you'll have to overcome some pretty steep odds.
The chances of winning the grand prize are about one in 258 million.
Mega Millions is played in 43 states, as well as Washington, DC and the Virgin Islands.