Highlights
- Slick land-based feel
- 243 ways
- Features Ladder
Contents
Millionaire Mystery Box Online Slot Theme
Big Time Gaming’s Who Wants to be a Millionaire online slot was a huge hit when it was released in 2018, and the studio wanted to follow it up with another great game.
The new Millionaire Mystery Box features similar graphics to Who Wants to be a Millionaire Megaways, with the gameshow backdrop and bright jewel-themed symbols.
Overall, it’s an eye-catching game that does capture your attention.
How to Play Millionaire Mystery Box Slot
Millionaire Megaways is a 243 Ways to Win online slot, offering players the ability to wager from £0.20.
Once you've decided on your bet level you can click the 'Play' button.
Remember to play responsibly, set a budget and when the fun stops, stop.
What is the RTP of the Millionaire Mystery Box Slot?
The RTP (return to player) of Millionaire Mystery Box is 96.64%.
It ‘s also a high-variance game, like Who Wants to be a Millionaire Megaways.
How to Win at Millionaire Mystery Box Slot
The purple gems pay out the most in this game, providing players with a prize worth 25x their stake for a five-of-a-kind winning combination.
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Millionaire Mystery Box Free Spins and Bonuses
When the Mystery Box symbol lands on the reels, all instances of that symbol will transform into one random symbol. It can turn into any regular symbol, and even into wilds and scatters.
To trigger the free spins round, you have to land three scatter symbols on the reels.
When you do this, you’ll receive 7 free spins, but there is a ladder along the right side of the reels that will add more free spins and provide you with multipliers on your bonus winnings.
For every additional scatter on top of the initial three, you’ll get more perks.
For example, the first extra scatter provides you with a 3x multiplier and gives you one more free spin.
If you manage to land 11 extra scatters, you’ll receive a massive 50x multiplier and get 15 extra free spins in total.
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5 Reels
| Slot Name: | Millionaire Mystery Box |
|---|---|
| Software: | Big Time Gaming |
| RTP: | 96.64% |
| Volatility: | High volatility |
| Paylines: | 243 |
| Reels: | 5 |
| Min Bet (all lines covered): | £0.20 (GBP) |
| Max Bet: | £100 (GBP) |
| Top Win: | 11590 |
| Features: | Wild Symbol, Scatter Symbol, Multiplier, Free Spins, 5 Reels, Mystery Symbols, High volatility |
| Themes: | TV & Movies, Game Shows |
| Last Update: | 29/06/2026 |
Available in UK?
|
Yes. Big Time Gaming have a UKGC license and are allowed to offer their games at UK licensed casinos. |
Millionaire Mystery Box FAQs
Is Millionaire Mystery Box online slot really random?
Yes, Millionaire Mystery Box from Big Time Gaming is a totally random online slot game, using RNG technology to ensure that all spins are fair.
Does Millionaire Mystery Box slot have free spins?
Yes, you can trigger the Millionaire Mystery Box free spins bonus by landing three scatters on the reels.
Is Millionaire Mystery Box free slots available on mobile platforms?
You can play Millionaire Mystery Box slots using any tablet, smartphone or PC.
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|
| Slot Name: | Millionaire Mystery Box |
|---|---|
| Software: | Big Time Gaming |
| RTP: | 96.64% |
| Volatility: | High volatility |
| Paylines: | 243 |
| Reels: | 5 |
| Min Bet (all lines covered): | £0.20 (GBP) |
| Max Bet: | £100 (GBP) |
| Top Win: | 11590 |
| Features: | Wild Symbol, Scatter Symbol, Multiplier, Free Spins, 5 Reels, Mystery Symbols, High volatility |
| Themes: | TV & Movies, Game Shows |
| Last Update: | 29/06/2026 |
|
Available in UK?
|
Yes. Big Time Gaming have a UKGC license and are allowed to offer their games at UK licensed casinos. |
