Play Millionaire Mystery Box

The game employs a configuration that is fairly unusual for Big Time Gaming, as it is playable from merely 0.20 on all platforms. It has 5 reels, 3 rows, and 243 ways to win, and the Mystery Box Reveal bonus can reveal any symbol, including special symbols like the wild and scatter. Like with the original, things become substantially more exciting when you get to sit in the Hot Seat, where you can win up to 24 free spins and a multiplier of up to 50x.

The same symbols are also used, including the royal values from 9 to A and the more valuable green, blue, red, and purple stones. The latter is the most profitable, with a payout of 25 times your bet for a five-of-a-kind. The 2x multicoloured symbol is the wild; it only appears on the three central reels, doubles all wins, and even multiplies itself if more than one occurs in a winning combination.

As implied by the slot's name, this variation of Who Wants to Be a Millionaire has a Mystery Box bonus. When the Mystery Box symbol appears on the three central reels, all occurrences of it will morph into a random symbol, including the wild and scatter. This increases the likelihood of forming winning combinations and gaining access to the free spins.

Big Time Gaming included the Gamble function since no Millionaire slot would be complete without it. In the Millionaire Mystery Box slot, it activates every time you land a winning combination in the base game, allowing you to double your winnings.

Who Wants to Be a Millionaire Mystery Box operates quite differently. In order to obtain access to the Free Spins feature, you must first land at least three scatter symbols; this will grant you seven free spins. Now, to the left of the reel set, you will see a ladder with additional spins and multipliers. Each scatter that appears during the free spins round will progress you up the ladder, boosting the win multiplier and adding to the total number of free spins. Collecting all eleven scatter symbols required to reach the top will result in a 50x win multiplier.

Hitting the top does not necessarily mean you will run out of free spins, as each scatter symbol that lands thereafter will continue to reward an additional free spin. In terms of potential, you might win up to 12,000 times your bet in this game.