Grubstake slot: RTP and max win
Grubstake is a high-volatility slot by Supergaming on Stake Engine, released 9 Aug 2026. Its base game returns 94.50%, 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 222,222 spins. It has 3 bonus buys priced at 25× to 200× the bet; the best returns 94.50%, so each buy costs 1.38× the bet on average over the long run. It is the No. 6765 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 v8. "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× | 94.50% | 20,000× | 1 in 222,222 | 1 in 3.92 | 1 in 69 | 0.06× base | Simulate |
| Ante | Boosted spin | 1.20× | 94.50% | 20,000× | 1 in 128,205 | 1 in 3.85 | 1 in 51 | 0.07× base | Simulate |
| Superante | Boosted spin | 5.00× | 94.50% | 20,000× | 1 in 30,769 | 1 in 3.27 | 1 in 19 | 0.28× base | Simulate |
| Superspin | Bonus buy | 25× | 94.50% | 20,000× | 1 in 6,154 | – | 1 in 15 | 1.38× base | Simulate |
| Bonus | Bonus buy | 100× | 94.50% | 20,000× | 1 in 10,000 | – | 1 in 5.05 | 5.50× base | Simulate |
| Super | Bonus buy | 200× | 94.50% | 20,000× | 1 in 2,000 | – | 1 in 4.56 | 11.00× 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 | |
|---|---|---|
| v8 | 94.500% | Active |
Frequently asked
What is the RTP of Grubstake?
Base spins return 94.50% of the amount wagered over the long run, from the published outcome table for version 8. All 3 of its bonus buys return 94.50%.
What is the max win in Grubstake and how likely is it?
The top payout is 20,000× the base bet. On a base spin it lands 1 in 222,222 spins. In the Superspin buy (25×) 20,000× lands 1 in 6,154 buys.
Does Grubstake have a bonus buy, and what does it cost?
Yes, 3 buy modes. Superspin: 25× the base bet, 94.50% RTP, an expected cost of 1.38× the base bet per buy. Bonus: 100× the base bet, 94.50% RTP, an expected cost of 5.50× the base bet per buy. Super: 200× the base bet, 94.50% RTP, an expected cost of 11.00× the base bet per buy.
Is Grubstake high or low volatility?
High. Its base-mode standard deviation is 43.2× 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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