Grimoire of the Deep slot: RTP and max win
Grimoire of the Deep is a high-volatility slot by 4phantom on Stake Engine, released 22 Jul 2026. Its base game returns 95.89%, below the median Engine slot (96.02%). The top payout is 25,000× the bet, bigger than 81% of Engine slots; from a base spin it lands about once every 2,769,107 spins. It has 3 bonus buys priced at 100× to 1,000× the bet; the best returns 96.02%, so each buy costs 3.98× the bet on average over the long run. It is the No. 5118 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 v3. "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× | 95.89% | 25,000× | 1 in 2,769,107 | 1 in 2.06 | 1 in 8.17 | 0.04× base | Simulate |
| Enhanced | Boosted spin | 3.00× | 95.86% | 25,000× | 1 in 570,421 | 1 in 1.95 | 1 in 11 | 0.12× base | Simulate |
| Bonus | Bonus buy | 100× | 96.02% | 25,000× | 1 in 8,053 | – | 1 in 11 | 3.98× base | Simulate |
| Super Bonus | Bonus buy | 500× | 95.98% | 25,000× | 1 in 2,510 | – | 1 in 4.68 | 20.11× base | Simulate |
| Boost 64 | Bonus buy | 1,000× | 96.00% | 25,000× | 1 in 1,792 | 1 in 1.31 | 1 in 2.18 | 39.97× base | Simulate |
Work out the cost of Grimoire of the Deep 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 | |
|---|---|---|
| v3 | 95.895% | Active |
Frequently asked
What is the RTP of Grimoire of the Deep?
Base spins return 95.89% of the amount wagered over the long run, from the published outcome table for version 3. Its bonus buys return between 95.98% and 96.02%.
What is the max win in Grimoire of the Deep and how likely is it?
The top payout is 25,000× the base bet. On a base spin it lands 1 in 2,769,107 spins. In the Bonus buy (100×) 25,000× lands 1 in 8,053 buys.
Does Grimoire of the Deep have a bonus buy, and what does it cost?
Yes, 3 buy modes. Bonus: 100× the base bet, 96.02% RTP, an expected cost of 3.98× the base bet per buy. Super Bonus: 500× the base bet, 95.98% RTP, an expected cost of 20.11× the base bet per buy. Boost 64: 1,000× the base bet, 96.00% RTP, an expected cost of 39.97× the base bet per buy.
Is Grimoire of the Deep high or low volatility?
High. Its base-mode standard deviation is 40.1× 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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