Once again the biggest game show in the world meets arguably the best maths in the world, a match made in heaven for all BTG and Who Wants to be a Millionaire fans. Millionaire Mystery Box is a 243 ways slot designed to deliver a game to suit every type of player. Millionaire Mystery Box has a slick land-based feel and will appeal to a broad demographic due to its relative simplicity. The game is based on a 243 ways structure, with a quick draw land-based double up gamble which includes the ability to gamble the total free spin win, putting the player once again in the hot seat. Millionaire Mystery Box Free Spins features a ladder delivering both the Free Spins Multiplier and extra Free Spins to the lucky player. As more scatters ring into the reels, the multiplier goes up and so does the potential!