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Who Wants to Be a Millionaire Mystery Box Slot - Review, Free & Demo Play

Big Time Gaming’s Who Wants to Be a Millionaire Mystery Box is a flawless 06/11/2019 release. The game maker’s partnership with Sony Studios has brought the popular show to our screens. We will explore RTP, max win, and volatility. You will also benefit from our list of hot casinos to catch the real money game and demo mode.

Who Wants to Be a Millionaire Mystery Box Free Play

Who Wants to Be a Millionaire Mystery Box logo
Big Time Gaming Release Date: 06.11.2019
Rating by Fabio Duarte
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Who Wants to Be a Millionaire Mystery Box
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Best Casinos to Play Who Wants to Be a Millionaire Mystery Box for Real Money

As fun as Who Wants to be a Millionaire Mystery Box is, playing in the right casino becomes essential to the experience. Thankfully, we have gone through the hassles of picking the best casinos for real money gameplay. Also, they might have some of the best bonuses to kick your gaming experience up a notch. You will be on their platforms with just a tap to explore further.

General information about Who Wants to Be a Millionaire Mystery Box slot

Release Date:
Max. win:
Bonus game:
Free spins:
Scatter Symbol:
Wild symbol:
Symbol Stacked:
Jackpot Game:
Slot lines:
Slot reels:
Stakes range (€/£/$):
0.1 to 40
Slot Theme:
TV show

How to Play

You should be fine tapping into gameplay with the following steps:

  1. Load this Big Time Gaming slot game
  2. Click “Continue” on the home screen
  3. Use the left and right arrow buttons to vary your wager
  4. Click the green rectangular Play button to start the game

Spinning this 5x3-reel slot machine will cost you from €0.10 to €40 per spin. You have a blend of A–9 playing cards and rich-looking orbs to catch a win from any of the 243 paylines. Nevertheless, you will get the support of wild multipliers, mystery boxes, and free spins.

Who Wants to Be a Millionaire Mystery Box RTP and Volatility


Who Wants to Be a Millionaire Mystery Box blends high volatility with a 96.64% RTP.

First, this online slot machine packs 243 paylines in its 5x3 reel game grid. While that is a staggering figure for the reel size, the high volatility will give less frequent wins. The big payouts will take a while to land, but we never know what chance holds.

Winning in this slot game requires landing three identical symbols from the leftmost reel. You can take that number to a maximum of five on a payline. Nevertheless, pulling in the high-paying symbols and breaking into the bonus round will most likely take more than a few spins.

When you land wins, you have the standard return to player percentage (RTP) by your side. Also, high volatility does not mean wins will not come, but it will cost you pretty pricey reel spins.


Who Wants to Be a Millionaire Mystery Box

If the name of this game does not remind you of the famous British TV show, the home screen certainly will. It brandishes the official symbol of the show with a few tweaks. Also, the background is dark and well-lit with neon lights to depict the hot seat and gaming room.

The music sounds like Big Time Gaming lifted it off the main TV show. We expected nothing less since they co-developed the slot with Sony Studios. Nonetheless, the reels are the standard 5x3 setup many providers use.

Most of the controls sit nicely on the right side of the screen, easily reachable and clutter-free.

The purple gem is the highest paying in the base game, with a value of 25x. It is also the only icon that pays for two on a payline.

The 9 and 10 playing cards have a maximum pay of 0.6x, J and Q pay 0.7x, while K and A balance things at 1x. The green gem’s max value of 2x is above the value of the playing cards. Following that are the red and blue gems with max values of 3x and 2.5x the bet.

Landing the wilds brings 2x multipliers on the winning spin. The mystery box reveals a symbol, and the free spins Scatter icon triggers the free spins.

Who Wants to Be a Millionaire Mystery Box slot paytable

Mobile Compatibility

Who Wants to Be a Millionaire Mystery Box slot mobile

Spinning up Who Wants to be a Millionaire Mystery Box on your mobile device will be a walk in the park. You might have a smaller screen estate, but the gameplay remains solid, even throughout the bonus rounds. If anything, the graphics become crisper because of the higher resolution. Unlike the desktop version, the controls stay at the bottom of the screen. Also, you do not have to download it, as HTML5 technology makes it playable directly in your browser.

About Big Time Gaming

Big Time Gaming is the proud developer of "Who Wants to Be a Millionaire Mystery Box." The company boasts innovation despite releasing several slot games in a year. It may have debuted with the new name in 2011, but its experience dates back decades, to 1996.

BTG is not just one of the most popular slot makers but also the winner of several awards. The most notable is the 2018 Top Slot Provider of the Year.

Other slot games from its studio include:

  • Queen of Riches Slot
  • Pirate Pays Megaways Slot
  • The Final Countdown Slot
  • Lil Devil Slot

Bonus Rounds & Free Spins


Gamble Feature

This online slot allows players to double their wins up to five times. You can get this bonus by clicking the “Gamble” button. However, lose it, and you lose your winnings.

Who Wants to Be a Millionaire Mystery Box slot gamble

Free Spins

Who Wants to Be a Millionaire Mystery Box has up to 20 free spins for any player that lands 5 Scatter symbols. Less than that, and you will get 12 or 7 spins for the bonus game.

The free spins round plays out with 12 multiplier rungs starting at 2x. Each Scatter symbol that appears takes you up a rung and adds one extra spin. The 4th, 8th, and 12th rungs give 3 extra spins with the multipliers. Nevertheless, you can win up to a 50x multiplier for a shot at the max win.

Who Wants to Be a Millionaire Mystery Box Demo Play

Instead of jumping into the real money game, you can get the demo on this page. That will save your bankroll while you slash through the gameplay for more understanding. You do not have to rush it, as the demo is entirely free.

Max Win


The max win in this BTG slot is 12,000x the bet.

Who Wants to Be a Millionaire Mystery Box brings in a fiery mix of multipliers, up to 50X. Landing the high-paying symbols will give you decent wins. You can add the wild multipliers, but that will not come close to the maximum win of 12,000 times your stake.

Breaking or landing a shot at that value requires getting to the 12th rung during the free spins round. That means you must continue landing new Scatter symbols to climb the multiplier ladder. Once at the top at 50X, you must land a winning combination with the highest paying symbol.

Overall Rating


Building the Who Wants to Be a Millionaire Mystery Box on the original TV show is a brilliant decision. Although it excludes the popular question and answer section, its execution of getting the multipliers is fantastic. Moreover, playing it becomes enjoyable as you only need to Scatter symbols rather than answering questions.

Big Time Gaming continues to innovate, especially after debuting the Megaways engine. Leaving out that game style in this slot seemed unsettling, but the traditional pay structure is a good fit.

It has up to 50x multipliers
Each new Scatter symbol adds an extra spin during the free spins round
The mystery box can reveal valuable symbols
Players need the free spins round plus wild symbols to hit the max win
The symbols do not reflect the TV show
Bonuses take time to trigger

Who Wants to Be a Millionaire Mystery Box Slot - FAQ

How do I play Who Wants to Be a Millionaire Mystery Box on my phone?

Go to any of our recommended online casinos in your browser and load the game.

Is there a bonus buy option?

You cannot buy any of the bonus features in the game.

How many paylines does the slot have?

This BTG game has 243 paylines that pay from the leftmost reel.

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Fabio Duarte
Fabio Duarte
Expert in: News, Blog, Slot reviews
Fabio is a young writer with +6 years of experience in gambling & betting. Fabio creates professional reviews of casino and slots. Every single article Fabio made exhibits deep analytical skill and comprehensive coverage of a topic. It’s Fabio – one of the leading authors on slotsjudge.com.
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