Blackhole slot: RTP and max win
Blackhole is a low-volatility slot by GRIMFORGE on Stake Engine, released 4 May 2026. Its base game returns 94.97%, below the median Engine slot (96.02%). It is the No. 6804 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 v6. "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 | Unknown | – | 94.97% | – | – | – | – | – | |
| Bonus | Unknown | – | 94.90% | – | – | – | – | – |
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 | |
|---|---|---|
| v6 | 94.972% | Active |
Frequently asked
What is the RTP of Blackhole?
Base spins return 94.97% of the amount wagered over the long run, from the published outcome table for version 6. Across its 2 modes RTP ranges from 94.90% to 94.97%.
Does Blackhole have a bonus buy?
No. None of its published modes costs 20× the base bet or more.
Is Blackhole high or low volatility?
Low. Its base-mode standard deviation is 6.1× the bet, which puts it in the lowest 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.