The Mega Millions lottery game doesn't have the highest starting jackpot around – it resets at $15 million after each win – but when it goes through an extended sequence of rollovers the jackpot climbs fast. Every rollover adds at least $5 million to the kitty, and often more, so after a few weeks without a winner the top prize can reach jaw-dropping heights. Anyone who doubts this need only look at the advertised jackpot for the next game this Tuesday, which stands at a colossal $309 million.
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