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To qualify for a chance to win big, players are required to make an additional jackpot side bet on top of their regular bets. If the table is playing ‘En Prison’, then even-money bets are instead left on the table, and returned to the player if they win the following spin. This variant sports a house edge closer to 5.3%, so if ever given the option we would always recommend choosing a European Roulette table over an American version. An American Roulette wheel is virtually identical to its European cousin, but the addition of a double zero – as well as the standard single zero – pushes the odds even further in favor of the house. Let’s take a look at some of the most popular roulette variants you’ll find. But beyond these three constants lies a whole world of variations, twists and fun versions of this casino classic.