About Euromillions Booster Fund
The booster fund is available to contribute to the jackpot, for example to boost the initial jackpot in a sequence of growing jackpots. The amount utilised each week is determined in advance by the participating lotteries.

• The odds of winning any prize at all are 1 in 24
• The odds of getting none of the 50 main balls but getting both lucky stars is approximately 1 in 62. This quirk of probability means that it is less likely than getting 2 main balls and one lucky star (1 in 39). However, there is no prize for only getting 2 lucky stars.
• 6% of the prize fund is allocated to a "Booster Fund" which can be used to boost the jackpot prize.
• The figures for estimated prize are just a guide, and the actual amount varies according to the total in the prize fund and the number of winners for each prize. (Estimated prizes as per reverse of UK playslip)
• If the Jackpot is not won, it rolls over until the following week. However, if the jackpot is not won on the twelfth successive week (i.e., eleven rollovers), then the jackpot prize is "rolled down" by distributing it between winners of the next level instead of rolling it forward again. Note: An exception to this rule would have occurred on 3 February 2006, which, if the jackpot had not been won, the jackpot would have been carried over for a thirteenth week (at which point it would have rolled down, if not won on 10 February 2006). This exception occurred due to the timing of the introduction of the roll-down rule.
• New rules introduced on January 4, 2007, that took effect on February 9, 2007 limit the number of consecutive draws to eleven, with the jackpot rolling down to lower prize levels in the eleventh draw if the jackpot is not won.
• The new rules also introduced "Event Draws" also referred to as "Superdraws", in which there will be a guarantee of the minimum amount which is available to pay prizes in the Match 5 and 2 Lucky Stars Prize Category; if an Event Draw isn't won it will be rolled down. The first Event Draw was held on February 9, 2007 for €100m (£66m, 165m sfr) to celebrate the Euromillions third birthday. A second "Superdraw" took place on February 8th 2008 for €130 Million (£95 Million) to celebrate the Euromillions fourth birthday.