It is my understanding that if there are two Mega Balls, then if either or both help to complete a line, then the win for that card shall be multiplied by the greater of the two multipliers.
A 21st bingo ball, known as the Mega Ball, is drawn from among the 31 balls left in the hopper.An estimated probability of each multiplier appears in the table below. A multiplier wheel is spun, with possible multipliers of 5x, 10x, 12x, 15x, 20x, 25x, 50x, and 100x.20 bingo balls are drawn without replacement and the bingo cards automatically daubed.The bingo cards are the 5x5 American kind, with a free square in the middle.The player may buy 1 to 200 bingo cards.
The game uses a hopper with balls numbered from 1 to 51.The game itself is an automated form of bingo featuring a random multiplier if the last ball drawn contributes to a bingo. Mega Ball is a live dealer game by Evolution Gaming, a provider of live dealer games for Internet casinos.