Millionaire Mystery Box

slot review (Big Time Gaming)

Find this game at:

Graphics 83%
Sounds 85%
Fun 81%
Volatility 72%
Overall 80%

Regular game:

Here is the game with the famous quiz as a theme from BTG studio. It is set on 5×3 grid with all combinations in play for 243 possible ways of winning. 

Gameplay is simple and fast. Some jurisdictions allow for a double up feature to be enabled.   

There are no stacked symbols and the only multiplier available is 2x. However, some nice wins can be lined up in the regular game. 


Game is called Mystery Box because there is a mystery symbol in play that reveals itself after all reels have stopped. Not much of a feature, plus it appears on reels 2,3 and 4 only. For most of the time, Mystery Box will be useless, but sometimes it can help for a decent win. 

It can also turn into the multiplier or a Bonus symbol. You need at least three Bonus (Scatter) symbols to start up the bonus. If you get more of them, then you will start the bonus with more spins. Three of them will start you up with 7 free spins. Bonuses, as usual, can end as a complete failure like this one in the video, but can be fantastic as the one below. Exactly as expected, right?   


Bonus is where it gets interesting. It is also simple, but exciting. You get the Multiplier Ladder with 12 levels and each level gives a higher multiplier. You need to collect, you guessed it, the Bonus symbols. In addition to higher multiplier, each Bonus collected gives you an additional free spin. There are also levels that give you 3 more free spins and you keep hoping to reach those.  The highest you can get to is 50x multiplier.

If you manage to reach the highest multiplier and also get lucky to win a nice combination with it, then payouts can get quite interesting, like this one in the video where I connected for a 335 times the bet win.


Millionaire Mystery Box is a simple and fun game with exciting Bonus round. Bonus is good at building expectations and that’s what the best games do. You get a feeling you are in the show and have a chance to win big time. 

This Knossi’s work is the most watched Millionaire video on YouTube, he connected for a nice win.