Euro Millions Super Draw
Normally, for each week that the Euromillions jackpot is not won, all the money in the jackpot pot for that week, is rolled-over to the jackpot pool for the following draw, so it gets bigger, and bigger. But, after 11 weeks of this, i.e. for the 12th draw, (or for special designated Superdraws) the rules change, and something called a Roll down comes into action.
