Up and down mahjong is a kind of electronic game, and its way of making money mainly depends on the points or gold coins lost by players in the game. Specifically, players need to buy virtual currency (such as gold coins) with real money in the game, and then use these virtual currencies to play the game. If players win the game, they can get more virtual currency, otherwise they will lose some or all of the virtual currency. Therefore, for operators, they can control the winning or losing probability of players by formulating the rules of the game and adjusting the odds, so as to ensure that they can obtain certain benefits. In addition, you can increase your income by guiding players to buy more virtual currency and providing other value-added services. It should be noted that any form of gambling is risky and may be illegal. Therefore, when participating in electronic games such as playing mahjong, please be sure to abide by relevant laws, regulations and ethics, and play rationally.