Jelly Serious slot: RTP and max win
Jelly Serious is a high-volatility slot by SERIOUS BOOK on Stake Engine, released 7 Jul 2026. Its base game returns 96.06%, above the median Engine slot (96.02%) and higher than 52% of them. The top payout is 10,000× the bet; from a base spin it lands about once every 96,637 spins. It has 2 bonus buys priced at 20× to 300× the bet; the best returns 96.00%, so each buy costs 12× the bet on average over the long run. It is the No. 3067 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 v11. "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 Game | Base spin | 1.00× | 96.06% | 10,000× | 1 in 96,637 | 1 in 17 | 1 in 23 | 0.04× base | Simulate |
| Extra Fs | Boosted spin | 10× | 96.06% | 10,000× | 1 in 27,476 | 1 in 69 | 1 in 72 | 0.39× base | Simulate |
| Extra Pepper | Boosted spin | 15× | 96.05% | 10,000× | 1 in 96,899 | 1 in 17 | 1 in 38 | 0.59× base | Simulate |
| Extra King | Bonus buy | 20× | 96.00% | 10,000× | 1 in 831 | 1 in 16 | 1 in 48 | 0.80× base | Simulate |
| Slime Bonus | Bonus buy | 300× | 96.00% | 10,000× | 1 in 1,250 | 1 in 2.33 | 1 in 6.14 | 11.99× base | Simulate |
Work out the cost of Jelly Serious 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 | |
|---|---|---|
| v11 | 96.057% | Active |
Frequently asked
What is the RTP of Jelly Serious?
Base spins return 96.06% of the amount wagered over the long run, from the published outcome table for version 11. All 2 of its bonus buys return 96.00%.
What is the max win in Jelly Serious and how likely is it?
The top payout is 10,000× the base bet. On a base spin it lands 1 in 96,637 spins. In the Slime Bonus buy (300×) 10,000× lands 1 in 1,250 buys.
Does Jelly Serious have a bonus buy, and what does it cost?
Yes, 2 buy modes. Extra King: 20× the base bet, 96.00% RTP, an expected cost of 0.80× the base bet per buy. Slime Bonus: 300× the base bet, 96.00% RTP, an expected cost of 11.99× the base bet per buy.
Is Jelly Serious high or low volatility?
High. Its base-mode standard deviation is 39.6× 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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