MYSTERYBOX slot: RTP and max win
MYSTERYBOX is a high-volatility slot by GUY STUDIO on Stake Engine, released 13 Sep 2026. Its base game returns 96.21%, above the median Engine slot (96.02%) and higher than 60% of them. The top payout is 50,000× the bet, bigger than 97% of Engine slots; from a base spin it lands about once every 5,000,002 spins. It has 3 bonus buys priced at 25× to 500× the bet; the best returns 96.21%, so each buy costs 0.95× the bet on average over the long run. It is the No. 3718 most played Engine slot over the last 30 days.
Every mode, side by side
Costs are multiples of the base bet. Odds come from the published outcome table for v1. "Returns the cost" counts rounds that pay back at least what the mode cost. Expected cost is cost × (1 − RTP): the average amount lost per round over the long run.
| Mode | Type | Cost | RTP | Max win | Max win odds | Pays anything | Returns the cost | Expected cost per round | |
|---|---|---|---|---|---|---|---|---|---|
| Base | Base spin | 1.00× | 96.21% | 50,000× | 1 in 5,000,002 | 1 in 2.96 | 1 in 9.32 | 0.04× base | Simulate |
| Triple Boost | Boosted spin | 2.00× | 96.21% | 50,000× | 1 in 5,000,007 | 1 in 2.88 | 1 in 16 | 0.08× base | Simulate |
| A1 | Bonus buy | 25× | 96.21% | 50,000× | 1 in 200,000 | 1 in 3.00 | 1 in 5.69 | 0.95× base | Simulate |
| Bonus | Bonus buy | 100× | 96.21% | 50,000× | 1 in 1,251,259 | every round | 1 in 4.48 | 3.79× base | Simulate |
| Superbonus | Bonus buy | 500× | 96.21% | 50,000× | 1 in 65,357 | every round | 1 in 6.06 | 18.95× base | Simulate |
Version history
Base-mode RTP per published math version. Older versions stay public in the fairness API, so changes can be checked.
| Version | Base RTP | |
|---|---|---|
| v1 | 96.210% | Active |
Frequently asked
What is the RTP of MYSTERYBOX?
Base spins return 96.21% of the amount wagered over the long run, from the published outcome table for version 1. All 3 of its bonus buys return 96.21%.
What is the max win in MYSTERYBOX and how likely is it?
The top payout is 50,000× the base bet. On a base spin it lands 1 in 5,000,002 spins. In the A1 buy (25×) 50,000× lands 1 in 200,000 buys.
Does MYSTERYBOX have a bonus buy, and what does it cost?
Yes, 3 buy modes. A1: 25× the base bet, 96.21% RTP, an expected cost of 0.95× the base bet per buy. Bonus: 100× the base bet, 96.21% RTP, an expected cost of 3.79× the base bet per buy. Superbonus: 500× the base bet, 96.21% RTP, an expected cost of 18.95× the base bet per buy.
Is MYSTERYBOX high or low volatility?
High. Its base-mode standard deviation is 27.8× the bet, which puts it in the highest third of Engine games. What volatility means.
Can I check that a result was fair?
Yes. Engine games use provably fair seeds. Once your server seed is revealed you can replay any round against the published outcome table. See how to verify a result.
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