Millionaire Mystery Box

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Who Wants To Be A Millionaire has been one of the most popular TV shows of the last couple of decades, so it is not surprising that Big Time Gaming have released a series of jackpot slot games based on the show. Here, I’m going to take a closer look at the Millionaire Mystery Box slot, which is another game based on the gameshow fronted by Chris Tarrant for many years.

I found that the slots online game has an RTP of 96.24%, and is played on a 5X3 grid with 243 paylines. Bet sizes range from 20p to £100 per spin, and it is a medium volatility slot with a top prize of 22,000 coins. Read on to find out what else I can tell you about the Millionaire Mystery Box slot!

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Millionaire Mystery Box Theme & Graphics

The Millionaire Mystery Box graphics are simpler than other games based on the TV show. They still have a slick feel to them, though, which is something that I’ve come to expect from Big Time Gaming slots. The reels are set on a gird in front of a backdrop that will look familiar to anyone who has watched Who Wants To Be A Millionaire over the years. A classy musical soundtrack based on the TV show’s theme tune adds more atmosphere.

The symbols on the reels do not relate to the TV show in any particular way. The higher value symbols are gemstones of various colours, while the lower value symbols are numbers and letters. The scatter symbol is the game’s logo, while the wild is a fluctuating rainbow symbol with an x2 sign in it. A mystery box symbol can also appear on reels two, three and four.

Other TV show-themed slots you might enjoy include:

Millionaire Mystery Box Slot Gameplay

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How to Play the Millionaire Mystery Box Slot

Before you can play the Millionaire Mystery Box slot game, you need to have an account at an online casino like Easy Slots. Open an account at Easy Slots by following these steps.

  1. Head to the Easy Slots homepage and click on the orange Join Now tab.
  2. Input the personal details required to validate your account.
  3. Include a valid email address.
  4. Select a memorable username and password.
  5. Deposit at least £10 in your new account to ensure you can claim your Easy Slots welcome bonus of up to 500 free spins on Starburst and Fluffy Favourites (Full Ts & Cs Apply).

Once your first deposit is displaying in your account, you can start to plat the Millionaire Mystery Box slot for real money. Find the game on the Easy Slots lobby page and click on it to open it up. Then you can follow these steps.

  • Click on the blue tab with lines in it. This will open the game's paytable, where you can find each symbol's value.
  • You can also see which are the scatter and wild symbols and read about how the feature works.
  • When you're ready to play, select your bet size using the green tabs on the reels' right side.
  • Click the green play button to start the reels spinning.
  • The Autoplay button is located just above the start button. You can set this to run for a certain number of spins or to end when you have lost a specific amount of money.

Millionaire Mystery Box Slots Reels

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Slot Game Statistics

Many slots fans like to analyse the hard facts about a game before trying it. Here are the key details about the Millionaire Mystery Box slot for any slots gamers who like to do this.

I discovered that you could set your stake sizes from 20p up to £100 in this Millionaire Mystery Box slot, and the top prize on offer is 22,000 coins. The RTP of 96.24% is about average, and the slot’s medium volatility meant that smaller wins and larger wins hit with around the same frequency. Big Time Gaming has given the slot a nice free spins feature, and the presence of mystery symbols on the reels adds an extra layer of excitement.

Millionaire Mystery Box slot


Min/Max bet



5X3, 243 paylines


TV show






Big Time Gaming

Max win

22,000 coins

Bonus Features

Free spins, mystery symbols, gamble feature, wild multipliers

*All of the above values are subject to change at any time.

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Millionaire Mystery Box Free Spins & Bonus Features

You can watch out four things for in the Millionaire Mystery Box slot that all confer some kind of bonus. Here are the details that I discovered about them.

Wild Multipliers

Any wins to which the wild symbol contributes are multiplied by x2.

Mystery Box

Mystery Box symbols can appear on reels two, three or four and will transform into matching symbols when they appear. This can create wins for you.

Free Spins

The free spins feature in the Millionaire Mystery Box slot is triggered when three, four or five of the logo symbols appear on the reels.

- Three symbols = seven spins

- Four symbols = 12 spins

- Five symbols = 20 spins

During the spins, a ladder with 12 rungs appears alongside the reels. Each scatter symbol that appears during the free spins will move you one rung up this ladder. Moving up the ladder brings additional multipliers and free spins. If you reach the top rung, you’ll receive a prize worth 50x your stake.

Gamble Feature

Every win you collect in the Millionaire Mystery Box slot can be gambled. When you opt to gamble, lights will flash on the rungs of a ladder, and if you manage to stop them in the right place, you can improve your winnings.

Verdict on this Slot

I heartily enjoyed playing the Millionaire Mystery Box slot and I’m sure you will too. My rating for the game is 8/10, as although it appeared quite basic at first there was actually a lot in this game that kept me gripped. The gamble feature is exciting and the free spins feature has some nice additional touches that give it an extra layer of class. I recommend that you head over to Easy Slots and try out the Millionaire Mystery Box game today, and while you are at it, why not try the Rainbow Riches Race Day slot too!

*All values (Bet Levels, Maximum Wins etc.) mentioned in relation to this slot game are subject to change at any time.

*Any Free Spins/Welcome Bonuses References are subject to the following: NEW PLAYERS ONLY, MIN DEPOSIT £10, MAX BONUS EQUAL TO LIFETIME DEPOSITS (UP TO £250), 65X WAGERING REQUIREMENTS AND FULL T&CS APPLY