Jeff's Gems slot: RTP and max win
Jeff's Gems is a medium-volatility slot by Twist Gaming on Stake Engine, released 1 May 2025. Its base game returns 97.00%, above the median Engine slot (96.02%) and higher than 97% of them. The top payout is 10,000× the bet; from a base spin it lands about once every 1,000,001 spins. It has 2 bonus buys priced at 100× to 200× the bet; the best returns 97.00%, so each buy costs 6.00× the bet on average over the long run. It is the No. 876 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 v2. "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× | 97.00% | 10,000× | 1 in 1,000,001 | 1 in 3.46 | 1 in 35 | 0.03× base | Simulate |
| Ante | Boosted spin | 1.20× | 97.00% | 10,000× | 1 in 833,334 | 1 in 4.83 | 1 in 43 | 0.04× base | Simulate |
| Super Ante | Boosted spin | 5.00× | 97.00% | 10,000× | 1 in 200,000 | 1 in 4.00 | 1 in 14 | 0.15× base | Simulate |
| Bonus | Bonus buy | 100× | 97.00% | 10,000× | 1 in 10,000 | – | 1 in 3.39 | 3.00× base | Simulate |
| Super | Bonus buy | 200× | 97.00% | 10,000× | 1 in 5,000 | – | 1 in 3.55 | 6.00× base | Simulate |
Work out the cost of Jeff's Gems 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 | |
|---|---|---|
| v2 | 96.998% | Active |
Frequently asked
What is the RTP of Jeff's Gems?
Base spins return 97.00% of the amount wagered over the long run, from the published outcome table for version 2. All 2 of its bonus buys return 97.00%.
What is the max win in Jeff's Gems and how likely is it?
The top payout is 10,000× the base bet. On a base spin it lands 1 in 1,000,001 spins. In the Super buy (200×) 10,000× lands 1 in 5,000 buys.
Does Jeff's Gems have a bonus buy, and what does it cost?
Yes, 2 buy modes. Bonus: 100× the base bet, 97.00% RTP, an expected cost of 3.00× the base bet per buy. Super: 200× the base bet, 97.00% RTP, an expected cost of 6.00× the base bet per buy.
Is Jeff's Gems high or low volatility?
Medium. Its base-mode standard deviation is 20.2× the bet, which puts it in the middle 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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