666 Bonanza slot: RTP and max win
666 Bonanza is a low-volatility slot by Gentry Games on Stake Engine, released 15 Aug 2025. Its base game returns 96.37%, above the median Engine slot (96.02%) and higher than 64% of them. The top payout is 10,000× the bet; from a base spin it lands about once every 10,000,000 spins. It has 1 bonus buy priced at 50× the bet; the best returns 96.80%, so each buy costs 1.60× the bet on average over the long run. It is the No. 627 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 v5. "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× | 96.37% | 10,000× | 1 in 10,000,000 | 1 in 12 | 1 in 12 | 0.04× base | |
| Bonus | Bonus buy | 50× | 96.80% | 5,000× | 1 in 144 | 1 in 9.31 | 1 in 46 | 1.60× base |
Work out the cost of 666 Bonanza 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 | |
|---|---|---|
| v5 | 96.368% | Active |
Frequently asked
What is the RTP of 666 Bonanza?
Base spins return 96.37% of the amount wagered over the long run, from the published outcome table for version 5. Its bonus buy returns 96.80%.
What is the max win in 666 Bonanza and how likely is it?
The top payout is 10,000× the base bet. On a base spin it lands 1 in 10,000,000 spins. In the Bonus buy (50×) 5,000× lands 1 in 144 buys.
Does 666 Bonanza have a bonus buy, and what does it cost?
Yes, 1 buy mode. Bonus: 50× the base bet, 96.80% RTP, an expected cost of 1.60× the base bet per buy.
Is 666 Bonanza high or low volatility?
Low. Its base-mode standard deviation is 5.3× 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.
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