1. Mega Joker  99% RTP. Mega Joker from NetEnt has been around for more than a decade. Though it's a relatively simple game with just three reels and three rows, Mega Joker is a famous and beloved high-volatility slot thanks largely to its eye-popping 99% RTP, bonus Supermeter game, and progressive jackpot.

Select 5 regular numbers from 1 70 and 1 Mega Ball number from 1 25. You can select the Quick Pick option or choose your own lucky numbers. To win the jackpot, match all five numbers (order doesn't matter) and the Mega Ball.

The Mega Millions jackpot is won by matching five white balls, in any order, plus the one yellow Mega Ball number. The second-level prize of $1 million is won by matching all five white balls, known as a Match 5. You can win seven additional ways by matching fewer numbers (see Prizes & Odds chart for details).