Released in November 2018, it didn’t take long for Big Time Gaming’s first branded slot Who Wants to Be a Millionaire Mystery Box to make the headlines in the casino community. Unfortunately, for the wrong reasons. Ever since the day of the announcement, the community had been brimming with speculation. Speculation about what would happen should you reach the top level in the game’s free spins feature.
Not long after launch date, a video was uploaded and shared by a community member. This had become the first player known to gamble his way up to the maximum 50 free spins. Disappointingly, he only managed to walk away with a 300x win. This is for a game with an advertised potential of well over 20,000x. This was laughably small. Looking at the mega wins that have been stacking up on YouTube and on forums across the web since then. However, leaves little doubt of the true potential of Who Wants to Be a Millionaire.

Millionaire Mystery Box is a slot based on the 2018 Big Time Gaming release Who Wants to Be a Millionaire. Playable from only 0.20 across all devices, the game utilizes a setup that is somewhat unusual for Big Time Gaming. And that we have only ever seen in Books of Gods before if we’re not mistaken. With 5 reels, 3 rows and 243 ways to win, it benefits from a Mystery Box Reveal feature that can reveal any symbol. Symbols including special symbols such as the wild and scatter. Just as with the original, things get significantly more interesting when you get to park your bottom in the Hot Seat where up to 24 free spins can be won along with a multiplier of up to 50x.
Millionaire Mystery Box Features
Just as the title of the slot suggests, this version of Who Wants to Be a Millionaire comes with a Mystery Box feature. Available on the three central reels only, when the Mystery Box symbol appears in view, all instances of it will transform into a random symbol, including wild and scatter. This helps create winning combinations as well as a chance to get access to the free spins.
No Millionaire game show slot is complete without a Gamble feature that’s why Big Time Gaming has made sure to implement one here as well. In the Millionaire Mystery Box slot, it comes into play whenever you land a winning combination in the base game upon whichupon you’re given the opportunity to double up. Essentially, this allows you to carry on gambling your win, doubling it step by step until you either hit the roof or decide to walk away with your win.
In the original slot, you could gamble your way up to 50 free spins. In Who Wants to Be a Millionaire Mystery Box, things are done a bit differently. Before anything, you need to land 3 or more scatter symbols in order to gain access to the Free Spin round. This will start you off with 7 spins. Now, to the left of the reel set you will notice a ladder arrangement with extra spins and multipliers. Every scatter that appears in view during the free spins round will move you up the ladder. This will increase the win multiplier whilst also adding extra spins to the total. Collecting all 11 scatters needed to reach the top will grant you a 50x win multiplier.
Millionaire Mystery Box Verdict
In some ways, Millionaire Mystery Box a cross between WWTBAM and Opal Fruits. It’s built on the thematic backbone of the original. But incorporates plenty of fresh new elements that, in our opinion at least, make it, not only a completely different game altogether. But a significantly better one as well. Why exactly, you might ask. Well, we’re intrigued by the fact that Big Time Gaming has opted to go for a more traditional reel mechanic. You know, being the inventors of the Megaways engine and all. And to be perfectly honest, we’re also glad to see that the free spins gamble feature has been left out. We were never huge fans of anyway.