A set of random numbers is chosen after every spin. The right set of numbers triggers the win. However, there are several rules to follow to qualify for the big prize:

• Some slots will only let you win if you bet the maximum number of credits per play.
• Some high-stakes slots award you with a ticket when you spin the reels. The more rounds you play, the more tickets you get. This increases your chances of winning.
• Other slots require hitting symbol combinations. For example, you may have to line up matching symbols on a 10th payline.
• Many games come with special bonus rounds. You may have to spin the prize wheel to win the jackpot.
• This mechanic works on RNGs. So, even if the prize has been unclaimed for quite some time, it doesn't mean the game is rigged.
• Some games come with must-drop jackpots. These are programmed to award the prize on a certain day.

Mega Moolah is responsible for the largest slot jackpot. In October 2015, UK-based soldier Jon Heywood earned $20,062,600 (30,355,616 NZD) and received the Guinness World Record title for "The largest jackpot payout in an online slot machine game."

If you're ready for a big win, check out these games:

• 40 Super Hot. Here, wilds pay 40x for three, 400x for four, and 1000x for five symbols.
• The Powerspin. This is a neat classic fruit machine with plenty of tricks up its sleeve.
• Oil Company II. If you hit the winning combo, you will get a very cushy 20,000 credit prize. The game comes with free spins and stacked wilds.
• Legendary Rome. This is a 5-reel slot that pays extremely well, offering up to 200,000 coins and the biggest reward of 10,000x.

The progressive jackpot at CookieCasino is going to keep rising, making your potential win even sweeter in the end.