What is a Must Be Won draw?
Lotto can only rollover fives times until there is a Must Be Won draw.
If no one matches six numbers and wins the jackpot in a Must Be Won draw, there is a Rolldown.
In a Rolldown, the jackpot is shared by players who match two or more main numbers.
According to the National Lottery website, this means thousands of people could win a boosted cash prize.