What are the prize tiers?
b 999 lotteries generally have a five to seven tier prize structure. The top tier is the jackpot, which requires the most numbers to match. Lower tiers still pay out with fewer matches.
Some lotteries have a "rollover" system — if nobody wins the jackpot in a draw, that prize carries over to the next draw and keeps growing. When the prize amount is fixed it is called a "fixed prize", and when it is a percentage of total tickets sold it is called "pari-mutuel".