Millionaire Mystery Box Slot Game

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Who Wants To Be A Millionaire: Mystery Box is a 5 reels, 243 paylines online slots game by Big Time Gaming. This slot offers Wild, Scatter symbols, Multiplier, Mystery symbols, Free spins, and Gamble features with an RTP of 96.64%. Join today to play Who Wants To Be A Millionaire: Mystery Box and over 1000 other great UK slots!

Millionaire Mystery Box slot UK

Millionaire Mystery Box Online Slot UK

"Who Wants To Be A Millionaire" is the TV quiz show that won't go away. It was presented successfully for years by Chris Tarrant but eventually ran its course and was cancelled. A few years ago, it was brought back with Jeremy Clarkson in the presenter's chair, and it seems to be just as popular as it ever was. That's led to another series of online slots based on the TV show despite the fact there were already more than five! Is this one a worthy addition to the chain? Let's see!

Millionaire Mystery Box Developer - Big Time Gaming

Never let it be said that Big Time Gaming doesn’t know how to get the most out of a license. This is one of several “Who Wants To Be A Millionaire” slots that the UK slots company has published, and each of them has proved to be popular. However, that’s not what the company is best known for. Big Time Gaming is (and probably always will be) best known for inventing the Megaways mechanism that now underpins so many of the world’s most popular online slots. The Megaways system first attracted the attention of players when Big Time used it in Bonanza UK Slot, which is still one of the most popular Megaways slots on the market. It probably goes without saying that they've made a Megaways version of "Who Wants To Be A Millionaire Online Slot," too! They're not married to the system, though - check out the Opal Fruits slot for proof of that.

Play Millionaire Mystery Box Mobile Slot

The attention to detail with the backdrop is probably the first thing (other than the famous theme music) that will strike you when you load the slot. The background is a photo-realistic depiction of the game show studio, minus the audience. Perhaps the slot is set in 2020. The show's logo hovers above the 5*3 reels, upon which the symbols are large but uninspired. The low values run right from 9 to A, and even when we get above them, the symbols are just differently coloured crystals. There was an opportunity to use some of the logos from the show here (phone a friend, ask the audience, and so on), so we're not sure why things have been kept so plain. The multicoloured "x2" symbol is a wild symbol, stepping in for everything apart from the scatter to make winning combinations and also doubling the worth of any win it becomes part of. The scatter is the slot's logo, which is also your ticket to bonus town.

Millionaire Mystery Box Slot Features

Mystery Symbols

Here's the feature that gave the slot its name. Red mystery boxes of a kind that would surely look more at home on "Deal or No Deal" land as stacks on the middle three reels and turn into matching symbols when the spin is over.

Free Spins

Here’s where the slot makes clever use of its license. Land three Millionaire logos for seven free spins, four logos for twelve* spins, or all five for twenty* spins. During those spins, the “question ladder” from the TV show is displayed to the right of the reels. Every additional logo that lands during your spins takes you one step up the ladder, gives you another free spin, and increases the multiplier that’s currently in play. You get a further three* spins as a reward when you reach the fourth, eighth, and then twelfth rung, and the multiplier at the top is x50*.


Not happy with your last win? Is that your final answer? If so, you can put it on the line by taking advantage of the gamble feature. Stop the lights at the right time to increase your win, but lose it altogether if your timing is off.

*Any references to bonuses and free spins are subject to the following terms: New players Only, £10 Min fund, £1,000 Max Bonus, Max Bonus Conversion equal to lifetime deposits up to £250. 65x Wagering requirements and Full T&C's Apply.

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