Quick answer
Millionaire Mystery Box is a Big Time Gaming slot (2019) with 96.64% RTP, medium volatility and a 22,000x max win. It uses 243 ways with mystery symbols and free spins. RTP can vary by casino.
Key specs
- RTP
- 96.64%
- Volatility
- Medium
- Max win
- 22,000x
- Grid
- 5×3
- Pays
- 243 ways
- Released
- 6 November 2019
- Bet range
- $0.20–$100
- Jackpot
- None
Casinos with Big Time Gaming games
- Solstice Spins50 Free Spins No Deposit + 100% up to $50035x bonusCarries Big Time GamingPlay at Solstice Spins (opens in new tab)
18+. New customers. Min dep: none for the free spins; $20 for the match bonus. 35x bonus wagering. Max bet $5. 14 days. 50 spins on Starburst at $0.10. Spin wins capped at $100. Full T&Cs apply.
Key terms
18+. New customers only. No deposit needed for the free spins. Min deposit $20 for the match bonus. 35x bonus wagering requirement. Max bet $5 while wagering. Free spins on Starburst at $0.10 per spin. Max win from free spins $100. Offer valid 14 days. Full T&Cs apply. Please gamble responsibly.
Check Millionaire Mystery Box is in the lobby in your country.
Themes:
Part of the Millionaire series.
How to play Millionaire Mystery Box (members only)
Instead of fixed lines, matching symbols on adjacent reels pay in any position, starting from the leftmost reel. The more matching symbols there are on each reel, the more ways the combination pays.
Millionaire Mystery Box is played on a 5×3 grid with 243 ways.
- Set your stake. Choose your total bet per spin between $0.20 and $100. Wins are paid as multiples of this stake.
- Check the paytable. Open the game's info screen to see what each symbol pays and the exact rules for this version.
- Spin. Each spin's result is decided by a certified random number generator, independent of previous spins.
- Trigger the bonus. Land the required scatter symbols to start the free spins feature.
The full Millionaire Mystery Box guide: how winnings work, 2 features and 3 strategy tips
- Your stake plan: a $50 budget → about $0.25 a spin (medium volatility)
- What 96.64% RTP costs per $100 wagered: $3.36 on average
- 2 features explained: mystery symbols, free spins
- Stake plans for $20 to $250 budgets, checked against the $0.20 minimum bet
- 4 slots with the same style and a higher RTP (up to 98.19%)
- Strategy tips and a session planner for Millionaire Mystery Box
Free · no card · 18+ only
Never sold · export or delete any time · What do members get?
How winnings work (members only)
What 96.64% RTP costs per $100 wagered, the 22,000x max win at a $1 stake
The top prize is capped at 22,000x your stake. On a $1 spin that is $22,000; on $0.20 it is $4,400. When the cap is reached the round usually ends immediately.
What 96.64% RTP means
Expected return = stake × 96.64%
Over $100 of total bets, the long-run average loss is $3.36
RTP is a long-run average across millions of spins. Any single session can finish far above or below it, especially on a medium volatility game.
Features explained (members only)
2 features explained: mystery symbols, free spins
Mystery symbols
Special symbols that all reveal the same randomly chosen regular symbol, which can complete several wins at once.
Free spins
A bonus round of spins played at no cost to your balance, usually triggered by landing three or more scatter symbols. Wins during the round are added to your balance, and many games let you retrigger extra spins.
Strategy tips (members only)
- Size your stake to the volatility. Medium volatility balances hit rate and win size. Expect dry spells between features, but not extreme swings. A simple rule: bring at least 200 spins' worth of budget, so a $50 budget suggests a stake of about $0.25.
2 more tips and a session planner
- Bonus wagering: at 96.64% RTP, clearing $1,000 of wagering costs about $33.60 on average. Check the bonus terms, as some casinos exclude specific games. Run your numbers in the wagering calculator.
- Set limits before you spin. Decide your loss limit and session time in advance and stop when you reach either. No pattern or betting system changes the outcome of a spin.
More on this in slot RTP and volatility explained and bankroll management.
Does it fit your budget? (members only)
Stake plans for $20 to $250 budgets, checked against the $0.20 minimum bet
For medium volatility we suggest a budget of at least 200 spins. This is what that means for Millionaire Mystery Box (bets from $0.20 up to a maximum bet of $100).
| Budget | Stake a spin | Bet range | Average cost of 200 spins |
|---|---|---|---|
| $20 | $0.10 | Below the $0.20 minimum bet | $0.67 |
| $50 | $0.25 | Fits | $1.68 |
| $100 | $0.50 | Fits | $3.36 |
| $250 | $1.25 | Fits | $8.40 |
Averages only: a short session can end far above or below them. Set a loss limit before you play.
Same style, better RTP (members only)
4 slots with the same style and a higher RTP (up to 98.19%)
Slots with the same mechanic (ways to win) and volatility (medium) as Millionaire Mystery Box, with a higher published RTP. Casinos can still run lower versions of any of them.
Cake Valley98.19% RTP · +1.55 pts
Crystopia98% RTP · +1.36 pts
Nine Tails98% RTP · +1.36 pts
Panda Panda98% RTP · +1.36 ptsQuestions
Frequently asked questions
Who makes Millionaire Mystery Box?
Millionaire Mystery Box is developed by Big Time Gaming and was released in 2019.
What is the RTP of Millionaire Mystery Box?
The default RTP of Millionaire Mystery Box is 96.64%.
Is Millionaire Mystery Box high volatility?
Millionaire Mystery Box is rated medium volatility. Medium volatility balances hit rate and win size.
What is the max win on Millionaire Mystery Box?
The maximum win on Millionaire Mystery Box is 22,000x your stake, which is $22,000 on a $1 spin.
Can I play Millionaire Mystery Box for free?
Not on GambGenius at the moment: we don't list an official Big Time Gaming demo of Millionaire Mystery Box.
Does Millionaire Mystery Box have a bonus buy?
No bonus buy is listed for Millionaire Mystery Box in the sources we checked.
Where can I play Millionaire Mystery Box?
Solstice Spins carries Big Time Gaming games. Check Millionaire Mystery Box is in the lobby in your country before you sign up. 18+ · New customers · T&Cs apply. Availability varies by country.
Where this data comes from
- bigtimegaming.com Provider
- bigwinboard.com Slot database
Specs come from the provider's own site and 1 independent slot database. Casinos can run lower-RTP versions, so always check the game rules before you play.
Game artwork © Big Time Gaming, shown to identify the game.
