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!