Nightmare slot: RTP and max win
Nightmare is a high-volatility slot by Probably Fair Studio on Stake Engine. Its base game returns 96.50%, above the median Engine slot (96.02%) and higher than 66% of them. The top payout is 36,666× the bet, bigger than 83% of Engine slots; from a base spin it lands about once every 4,076,190 spins. It has 4 bonus buys priced at 100× to 2,000× the bet; the best returns 96.50%, so each buy costs 3.50× the bet on average over the long run. It is the No. 2816 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 v2. "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× | 96.50% | 36,666× | 1 in 4,076,190 | 1 in 6.27 | 1 in 6.27 | 0.04× base | Simulate |
| Ante | Boosted spin | 2.00× | 96.50% | 36,666× | 1 in 1,358,730 | 1 in 6.03 | 1 in 9.12 | 0.07× base | Simulate |
| Nightmare Bonus | Bonus buy | 100× | 96.50% | 36,666× | 1 in 14,590 | – | 1 in 3.54 | 3.50× base | Simulate |
| Super Nightmare | Bonus buy | 300× | 96.50% | 36,666× | 1 in 8,754 | – | 1 in 3.28 | 10.50× base | Simulate |
| Mystery | Bonus buy | 500× | 96.50% | 36,666× | 1 in 5,137 | 1 in 1.69 | 1 in 5.87 | 17.50× base | Simulate |
| Bloodmoon | Bonus buy | 2,000× | 96.50% | 36,666× | 1 in 100 | 1 in 3.54 | 1 in 3.54 | 70.00× 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 | |
|---|---|---|
| v2 | 96.500% | Active |
Frequently asked
What is the RTP of Nightmare?
Base spins return 96.50% of the amount wagered over the long run, from the published outcome table for version 2. All 4 of its bonus buys return 96.50%.
What is the max win in Nightmare and how likely is it?
The top payout is 36,666× the base bet. On a base spin it lands 1 in 4,076,190 spins. In the Nightmare Bonus buy (100×) 36,666× lands 1 in 14,590 buys.
Does Nightmare have a bonus buy, and what does it cost?
Yes, 4 buy modes. Nightmare Bonus: 100× the base bet, 96.50% RTP, an expected cost of 3.50× the base bet per buy. Super Nightmare: 300× the base bet, 96.50% RTP, an expected cost of 10.50× the base bet per buy. Mystery: 500× the base bet, 96.50% RTP, an expected cost of 17.50× the base bet per buy. Bloodmoon: 2,000× the base bet, 96.50% RTP, an expected cost of 70.00× the base bet per buy.
Is Nightmare high or low volatility?
High. Its base-mode standard deviation is 26.7× 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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