The game of mahjong requires four players, 144 tiles and two dice to roll. It's important to note, however, that there are variations in how the game is played from country to country. The goal of mahjong is similar to poker, in that the aim is to make matching sets and pairs.

Like all gambling games, luck does play a major role in poker, especially in the short term. Poker is different than any other form of gambling, however. Unlike the other games on a casino floor, poker is a game of skill, and the world's top pros make money because they're the best players in the game.