The European wheel has just the zero, whereas the American wheel also has the double-zero. The lower right cell shows a house edge of 10.65%. Roulette has two versions: American Roulette and European Roulette. I do not know what is the most common win, but the following return table shows the odds for a win of 150 to 1. There is also a version of 2G'$ for triple-zero roulette. I first saw the game at the 2013 Global Gaming Expo and later at the Tropicana in Las Vegas on February 18, 2014. Divide that by the one-unit original bet and you have a house edge of 5.33% by parlaying, relative to the initial bet. Double Ball Roulette plays like regular roulette, except with two balls. If the player parlays, his expected loss between the two bets is the sum of 1/37 = 0.0270 units from the first bet and an average of (1/37)*36*(1/37) = 0.0263 from the possible second bet for a total of 0.0533 units.
The answer has to do with the way the house edge is defined. The initial game objective is to predict. The extra pocket inclusion impacts its odds and players’ game results. It is similar to the European variation but has an additional double zero (00) pocket along with the standard single zero (0). The astute reader may wonder why the player should accept a win of 1,300, at a house edge of 4.97%, rather than parlay, when the house edge in single-zero roulette is 2.70%. American Roulette is a casino table game in which players place bets on the outcomes of a spinning wheel. Thus, I would do that rather than accept a win of 1,275 or less. By parlaying a first win on zero himself, the player can achieve a win for two consecutive zeros of 1,296 to 1.
