The National Lottery is warning those wanting to play this Saturday's mammoth Lotto draw to make sure they get a ticket early.
On Wednesday night, the UK's biggest ever Lotto jackpot went unclaimed meaning an estimated £60m is up for grabs at the weekend.
And the money will have to be won.
New regulations introduced by the operator mean that even if the six winning numbers are not chosen by one lucky player, the money will go to those matching the numbers in the next tier where there is at least one winner.
However, should one person have all six winning numbers they will become the UK's biggest ever jackpot winner in the competition's history.
In addition to the jackpot, National Lottery Camelot will make one person a millionaire with its Millionaire Raffle, which has created 67 millionaires since October last year. Twenty people are also guaranteed to win £20,000 each.
The National Lottery has warned customers it expects a huge surge in online sales and for those hoping to play the game to not leave their purchase to the last minute.
On Friday morning an email was sent out to those registered to play the game online.
"If you plan to buy a ticket and need to add funds to your account to play, we would recommend that you do this as early as possible in order to avoid disappointment," it said.
Such was demand for tickets for Wednesday night's draw the lottery's website crashed.
A National Lottery spokesperson said: "We now have a record breaking Lotto jackpot up for grabs this Saturday and it has to be won this weekend no matter what.
"If one person banks Saturday's estimated jackpot, they will be the biggest Lotto jackpot winner ever created in the UK. If none of our players match all six numbers on Saturday night, then the colossal jackpot prize will be shared among the winners in the next winning prize tier, potentially creating several multi-millionaires.
"The National Lottery is all about making millionaires and this weekend is going to be a bumper one whichever way you look at it. We urge players not to leave it until the last minute to purchase a ticket for Saturday's draw. And don't forget that each and every ticket sold helps raise more money for Good Cause projects, totalling up to more than £34m every single week."