In the present invention, a player makes a basic bet, chooses whether to make an additional bet on an additional bet element, and executes, by utilizing a control unit, the following steps: allocating a fixed proportion of an amount of the basic bet and an amount of the additional bet to be accumulated into a payoff value; choosing to perform an additional raising game flow or a basic game flow according to the presence or absence of the additional bet; in the absence of the additional bet, performing, by the control unit, the basic game flow to generate a basic payment value; in the presence of the additional bet, performing, by the control unit, the additional raising game flow to generate an additional raising payment value; and when a game result generated by a game host conforms to the bet of a player, giving the value to the player.
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