Sinkhole slot: RTP and max win
Sinkhole is a high-volatility slot by Medusa on Stake Engine, released 17 Oct 2026. Its base game returns 96.00%, below the median Engine slot (96.02%). The top payout is 50,000× the bet, bigger than 97% of Engine slots; from a base spin it lands about once every 10,000,071 spins. It has 4 bonus buys priced at 100× to 1,000× the bet; the best returns 96.00%, so each buy costs 4.00× the bet on average over the long run. It is the No. 2809 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× | 96.00% | 50,000× | 1 in 10,000,071 | 1 in 2.10 | 1 in 5.94 | 0.04× base | Simulate |
| Extra Chance | Boosted spin | 3.00× | 96.00% | 50,000× | 1 in 2,000,000 | 1 in 1.96 | 1 in 27 | 0.12× base | Simulate |
| Feature Normal | Bonus buy | 100× | 96.00% | 50,000× | 1 in 250,001 | – | 1 in 5.56 | 4.00× base | Simulate |
| Feature Mystery | Bonus buy | 500× | 96.00% | 50,000× | 1 in 54,999 | – | 1 in 4.08 | 20.00× base | Simulate |
| Feature Super | Bonus buy | 500× | 96.00% | 50,000× | 1 in 40,000 | – | 1 in 4.32 | 20.00× base | Simulate |
| Feature Feast | Bonus buy | 1,000× | 96.00% | 50,000× | 1 in 13,000 | – | 1 in 4.15 | 40.00× 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 | 95.999% | Active |
Frequently asked
What is the RTP of Sinkhole?
Base spins return 96.00% of the amount wagered over the long run, from the published outcome table for version 1. All 4 of its bonus buys return 96.00%.
What is the max win in Sinkhole and how likely is it?
The top payout is 50,000× the base bet. On a base spin it lands 1 in 10,000,071 spins. In the Feature Normal buy (100×) 50,000× lands 1 in 250,001 buys.
Does Sinkhole have a bonus buy, and what does it cost?
Yes, 4 buy modes. Feature Normal: 100× the base bet, 96.00% RTP, an expected cost of 4.00× the base bet per buy. Feature Mystery: 500× the base bet, 96.00% RTP, an expected cost of 20.00× the base bet per buy. Feature Super: 500× the base bet, 96.00% RTP, an expected cost of 20.00× the base bet per buy. Feature Feast: 1,000× the base bet, 96.00% RTP, an expected cost of 40.00× the base bet per buy.
Is Sinkhole high or low volatility?
High. Its base-mode standard deviation is 32.4× 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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