Jolly Bones slot: RTP and max win
Jolly Bones is a high-volatility slot by Ryans Wall on Stake Engine, released 3 Aug 2026. Its base game returns 96.50%, above the median Engine slot (96.02%) and higher than 66% of them. The top payout is 15,000× the bet, bigger than 50% of Engine slots; from a base spin it lands about once every 750,000 spins. It has 3 bonus buys priced at 100× to 300× the bet; the best returns 96.50%, so each buy costs 3.50× the bet on average over the long run. It is the No. 5719 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 v9. "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× | 96.50% | 15,000× | 1 in 750,000 | 1 in 2.38 | 1 in 19 | 0.04× base | Simulate |
| Ante | Boosted spin | 1.25× | 96.50% | 15,000× | 1 in 500,000 | 1 in 2.38 | 1 in 51 | 0.04× base | Simulate |
| Bonus Standard | Bonus buy | 100× | 96.50% | 15,000× | 1 in 20,000 | – | 1 in 4.71 | 3.50× base | Simulate |
| Bonus Enhanced | Bonus buy | 200× | 96.50% | 15,000× | 1 in 10,000 | – | 1 in 4.51 | 7.00× base | Simulate |
| Bonus Extreme | Bonus buy | 300× | 96.50% | 15,000× | 1 in 3,000 | – | 1 in 3.96 | 10.50× base | Simulate |
Work out the cost of Jolly Bones bonus buys at your bet size
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 | |
|---|---|---|
| v9 | 96.500% | Active |
Frequently asked
What is the RTP of Jolly Bones?
Base spins return 96.50% of the amount wagered over the long run, from the published outcome table for version 9. All 3 of its bonus buys return 96.50%.
What is the max win in Jolly Bones and how likely is it?
The top payout is 15,000× the base bet. On a base spin it lands 1 in 750,000 spins. In the Bonus Standard buy (100×) 15,000× lands 1 in 20,000 buys.
Does Jolly Bones have a bonus buy, and what does it cost?
Yes, 3 buy modes. Bonus Standard: 100× the base bet, 96.50% RTP, an expected cost of 3.50× the base bet per buy. Bonus Enhanced: 200× the base bet, 96.50% RTP, an expected cost of 7.00× the base bet per buy. Bonus Extreme: 300× the base bet, 96.50% RTP, an expected cost of 10.50× the base bet per buy.
Is Jolly Bones high or low volatility?
High. Its base-mode standard deviation is 45.8× 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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