Who Wants to be a Millionaire Mystery Box slot review

By Big Time Gaming

Who Wants to be a Millionaire Mystery Box Slot

Who Wants to be a Millionaire Mystery Box Basic info

Game provider Big Time Gaming

Release Date 11/2019

RTP 96.64%

Game Technology HTML5

Popularity Medium

Min bet $0.20

Max bet $20

Max Win bet x 6075

Gamble Feature Freespins, Multiplier, Multiplier wilds, Wilds, Scatter symbols

Layout 5x3

Devices Support all devices

Configurable Winlines No

Volatility Medium

Progressive Jackpot No

One of the most iconic quiz-shows crosses over to the slot side. Who Wants to Be a Millionaire is a 5-reel, 3-row slot that uses the 243 Megaways system.

The design is clean and precise to the point it almost feels sterile. In the background, there is the familiar Millionaire stage. The music, of course, is the repeated theme tune which does get a bit tedious the more you play.

However, the FX work well and I like the animation that pops up whenever a win greater than your bet happens.


The higher-paying symbols are represented by gems whilst lower-paying ones use cars suits between 9 and Ace. All symbols follow a simple, yet attractive design. Even the lower-paying symbols are nice to look at.

The symbols, from highest to the lowest consist of:

  • The scatter tile is the Who Wants to Be a Millionaire logo. Three or more of these will start the bonus round. The scatter tile also pays 200x with five tiles on the reels.
  • The Wild tile is a ‘x2’ symbol with a rainbow flurry in the background. These tiles act as a wild and will substitute for all symbols (bar the scatter). They will also double the win amount.
  • The purple gem yields 25x with five-of-a-kind on a payline.
  • The red gem yields 3x with five-of-a-kind on a payline.
  • The blue gem yields 2.5x with five-of-a-kind on a payline.
  • The green gem yields 2x with five-of-a-kind on a payline.
  • The Ace and King tiles yield 1x with five-of-a-kind on a payline.
  • The Queen and Jack tiles yield 0.7x 2x with five-of-a-kind on a payline.
  • The 10 and 9 tiles yield 0.6x 2x with five-of-a-kind on a payline.

Whenever a win is registered, the tiles will flash according to the primary colour of the tile. And if the win is larger than the bet amount an animation will also follow.


  • The Bonus Round

To enter the bonus round 3 or more Millionaire scatters need to appear on the reels. With 3 scatters there are 7 free spins up for grabs. Get 4 for 12 free spins whilst 5 will award 20 free spins.

  • The multiplier wild

The wild appears on reels 2, 3 and 4. It substitutes for all symbols apart from the scatter. All wins are doubled when the tile makes an appearance. But something you will get more than 1 Wild and this is where some big wins can happen.

  • The Mystery box feature

Just like the scatter, mystery boxes appear on reels 2, 3 and 4. Once the reels stop the symbols for each box are then uncovered. Multiple mystery boxes will hold the same symbol.

  • The Risk Game

For every win, a ‘gamble’ feature will appear. Clicking this will take you to the double or nothing game. If you win the round the money is doubled and you can go to the next round up to 5 times. However, if you lose you walk away with nothing.


Who Want to Be a Millionaire is a plain and simple slot. In fact, it has the simplicity of NetEnt’s Starburst which is what some players look for.

There aren’t too many features to look out for bar the bonus round and the wild multiplier. However, the 243 Megaways engine means you will see a lot of wins happening. These are all on the smaller side and most of them will be under the bet value. But every so often there will be wins hovering around 5x.

What was disappointing was the mystery box feature. Since it is also included in the name of the slot I thought it was going to be an important feature. However, this doesn’t add much to the overall game. The mystery box rarely appeared and when it did it was so disappointing.

Keeping all this in mind, the RTP value of 96.64% and the variance set at medium, make this game a good contender for a wagering slot. Other than that, I just couldn’t get excited about this slot. When I think of Who Wants to Be a Millionaire, what I think of is multiple choice. And if that element was somehow included here, I’m sure this game would have had more oomph.

Leticia Miranda

Leticia Miranda

Slot Games Analyst

Leticia Miranda is a former gambling reporter who knows everything about slot games and is happy to share her knowledge. She has covered a broad swath of topics and trends on gambling and is always full of new ideas and energy. Leticia also has a master’s degree in journalism from New York University and is passionate about writing.