Double Roll is a modern Shark prototype of a legendary roulette. One of the theories that lies behind the roulette is that the inventor of the roulette prototype is Blaise Pascal, who developed a perpetual motion machine and presented a primitive form of roulette as a variation of such an engine. The idea of a perpetual motion engine fully correlates with the DoubleRoll game powered by Shark Games. It looks like an endless spinning line with 14 sectors of red and black colors and a 15th green sector “zero”. The players can bet on the sector the index finger will point: red, black, or green. All the bettors are divided into 3 teams and after placing the bet every player sees what team they belong to and cheer for correspondingly. This feature indicates that the level of engagement is quite high in this game.