Fossil Fortune slot: RTP and max win
Fossil Fortune is a medium-volatility slot by SpinForge Studios on Stake Engine, released 17 Sep 2026. Its base game returns 95.01%, below the median Engine slot (96.02%). The top payout is 20,000× the bet, bigger than 59% of Engine slots; from a base spin it lands about once every 2,000,000 spins. It has 5 bonus buys priced at 50× to 1,000× the bet; the best returns 95.01%, so each buy costs 2.50× the bet on average over the long run. It is the No. 4150 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 v4. "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× | 95.01% | 20,000× | 1 in 2,000,000 | 1 in 2.63 | 1 in 5.86 | 0.05× base | Simulate |
| Bonus Hunt | Boosted spin | 3.00× | 95.01% | 20,000× | 1 in 500,000 | 1 in 2.51 | 1 in 8.61 | 0.15× base | Simulate |
| Fossil Spins | Bonus buy | 50× | 95.01% | 20,000× | 1 in 100,000 | 1 in 2.22 | 1 in 4.89 | 2.50× base | Simulate |
| Triassic Spins | Bonus buy | 100× | 95.01% | 20,000× | 1 in 50,000 | 1 in 1.02 | 1 in 6.23 | 4.99× base | Simulate |
| Jurassic Spins | Bonus buy | 200× | 95.01% | 20,000× | 1 in 25,000 | 1 in 1.14 | 1 in 5.81 | 9.98× base | Simulate |
| Cretaceous Spins | Bonus buy | 400× | 95.01% | 20,000× | 1 in 6,667 | 1 in 1.32 | 1 in 3.88 | 19.96× base | Simulate |
| God Mode | Bonus buy | 1,000× | 95.01% | 20,000× | 1 in 2,000 | – | 1 in 3.22 | 49.90× base | Simulate |
Work out the cost of Fossil Fortune 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 | |
|---|---|---|
| v4 | 95.010% | Active |
| v3 | 95.010% |
Frequently asked
What is the RTP of Fossil Fortune?
Base spins return 95.01% of the amount wagered over the long run, from the published outcome table for version 4. All 5 of its bonus buys return 95.01%.
What is the max win in Fossil Fortune and how likely is it?
The top payout is 20,000× the base bet. On a base spin it lands 1 in 2,000,000 spins. In the Fossil Spins buy (50×) 20,000× lands 1 in 100,000 buys.
Does Fossil Fortune have a bonus buy, and what does it cost?
Yes, 5 buy modes. Fossil Spins: 50× the base bet, 95.01% RTP, an expected cost of 2.50× the base bet per buy. Triassic Spins: 100× the base bet, 95.01% RTP, an expected cost of 4.99× the base bet per buy. Jurassic Spins: 200× the base bet, 95.01% RTP, an expected cost of 9.98× the base bet per buy. Cretaceous Spins: 400× the base bet, 95.01% RTP, an expected cost of 19.96× the base bet per buy. God Mode: 1,000× the base bet, 95.01% RTP, an expected cost of 49.90× the base bet per buy.
Is Fossil Fortune high or low volatility?
Medium. Its base-mode standard deviation is 20.0× 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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