BlackJack Mayhem slot: RTP and max win
BlackJack Mayhem is a medium-volatility slot by Darkbyte on Stake Engine, released 23 Aug 2026. Its base game returns 96.50%, above the median Engine slot (96.02%) and higher than 82% of them. The top payout is 25,000× the bet, bigger than 81% of Engine slots; from a base spin it lands about once every 9,992,006 spins. It has 5 bonus buys priced at 100× to 200× 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. 2255 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 v10. "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% | 25,000× | 1 in 9,992,006 | 1 in 1.72 | 1 in 7.05 | 0.03× base | Simulate |
| Ante | Boosted spin | 1.25× | 96.50% | 25,000× | 1 in 10,005,404 | 1 in 1.72 | 1 in 7.45 | 0.04× base | Simulate |
| Super Ante | Boosted spin | 1.50× | 96.50% | 25,000× | 1 in 10,053,685 | 1 in 1.72 | 1 in 6.60 | 0.05× base | Simulate |
| Bonus | Bonus buy | 100× | 96.50% | 25,000× | 1 in 10,000,000 | every round | 1 in 3.16 | 3.50× base | Simulate |
| Bonus Random | Bonus buy | 128× | 96.50% | 25,000× | 1 in 10,000,000 | every round | 1 in 3.14 | 4.48× base | Simulate |
| Bonus Double | Bonus buy | 150× | 96.50% | 25,000× | 1 in 10,000,000 | every round | 1 in 3.15 | 5.25× base | Simulate |
| Bonus Split | Bonus buy | 200× | 96.50% | 25,000× | 1 in 10,000,000 | every round | 1 in 3.16 | 7.00× base | Simulate |
| Maxwin Ante | Bonus buy | 200× | 96.50% | 25,000× | 1 in 10,000,000 | 1 in 1.05 | 1 in 3.04 | 7.00× base | Simulate |
Work out the cost of BlackJack Mayhem 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 | |
|---|---|---|
| v10 | 96.501% | Active |
Frequently asked
What is the RTP of BlackJack Mayhem?
Base spins return 96.50% of the amount wagered over the long run, from the published outcome table for version 10. All 5 of its bonus buys return 96.50%.
What is the max win in BlackJack Mayhem and how likely is it?
The top payout is 25,000× the base bet. On a base spin it lands 1 in 9,992,006 spins. In the Bonus buy (100×) 25,000× lands 1 in 10,000,000 buys.
Does BlackJack Mayhem have a bonus buy, and what does it cost?
Yes, 5 buy modes. Bonus: 100× the base bet, 96.50% RTP, an expected cost of 3.50× the base bet per buy. Bonus Random: 128× the base bet, 96.50% RTP, an expected cost of 4.48× the base bet per buy. Bonus Double: 150× the base bet, 96.50% RTP, an expected cost of 5.25× the base bet per buy. Bonus Split: 200× the base bet, 96.50% RTP, an expected cost of 7.00× the base bet per buy. Maxwin Ante: 200× the base bet, 96.50% RTP, an expected cost of 7.00× the base bet per buy.
Is BlackJack Mayhem high or low volatility?
Medium. Its base-mode standard deviation is 15.4× the bet, which puts it in the middle 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.
Slots with similar math to BlackJack Mayhem
Matched on volatility, max win, RTP and whether there's a bonus buy. Not on theme.
Divine TouchTalore Labs RTP96.50%Max win25,000×Volatility
Noir RushDarkbyte RTP96.50%Max win25,000×Volatility
PORTAL OVERLOADXIAOCHUN RTP96.50%Max win25,000×Volatility
Plague DoctorRTP.EXE RTP96.50%Max win25,000×Volatility
Crush DepthMidia Gaming RTP96.50%Max win25,000×Volatility
Troy Storm PlusGEMINI GAMING RTP96.50%Max win25,000×Volatility