96.64% RTP

Millionaire Mystery Box Slot

Play Millionaire Mystery Box Slots for real money

Step into the hot-seat of Big Time Gaming's Who Wants to Be a Millionaire-themed ‘Millionaire Mystery Box’ slot game. It's the second slot inspired by this iconic TV quiz show, bringing you a trio of bonus features played out across 243 pay lines.

It's all about the Free Spins round here though, with the chance to work your way up the prize ladder and bag win multipliers worth up to 50x your initial stake. The Gamble feature also maintains the slot's gameshow element, allowing you to enter a 'double or quits' screen.



Millionaire Mystery Box slot game features

  • Start playing from only 0.20 credits per spin
  • Mystery Box Reveal bonus
  • Win up to 24 free spins with 50x multipliers
  • Modelled on the Who Wants to Be a Millionaire TV studio
  • Slot provider: Big Time Gaming


How to play Millionaire Mystery Box slot

It's easy to get the reels spinning here. Set your stake using the left and right arrow buttons, with your chosen wager displayed on-screen. It may also be possible to utilise the game's

auto play function, allowing you to play multiple spins with a single click.

There are six low-value symbols on the reels, with playing card values from nine to Ace in-play. There are also red, green, blue and purple gems. The x2 multi-coloured symbol is the game's wild, which can substitute for any other symbol except the branded Who Wants to Be a Millionaire scatter.

During any base game spin, the Mystery Box Reveal feature can activate, turning any symbol on reels two, three or four into a wild or scatter to help form or improve pay-line combos.

Land between three and five scatters anywhere on the reels to bag between seven and 20 free spins. Land five scatters to start on the third rung of the 12-step multiplier ladder. With each scatter you land during your free spins, you'll move up the multiplier ladder, up to a maximum of 50x. Once you reach the top rung of the multiplier ladder, every scatter you land awards one extra spin of the reels.


Millionaire Mystery Box Maximum Win

The maximum pay-out available in Millionaire Mystery Box is set at 25x among the base game symbols and 50x in the Free Spins feature.

We've got plenty more new slot titles for Paddy Power Games customers where Millionaire Mystery Box came from.

Millionaire Mystery Box FAQ


Millionaire Mystery Box is one of the Medium volatility games you can play at Paddy Power.


Millionaire Mystery Box is one of the Branded themed games offered by Paddy Power.