Spark Duel slot: RTP and max win
Spark Duel is a low-volatility slot by St0rk Studios on Stake Engine. The top payout is 4,000× the bet; from a base spin it lands about once every 1,000,000 spins. It has 28 bonus buys priced at 25× to 500× the bet; the best returns 96.70%, so each buy costs 0.83× the bet on average over the long run.
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× | 96.70% | 4,000× | 1 in 1,000,000 | 1 in 6.67 | 1 in 7.88 | 0.03× base | Simulate |
| Bonus Ante | Boosted spin | 2.00× | 96.70% | 4,000× | 1 in 1,000,000 | 1 in 6.67 | 1 in 8.44 | 0.07× base | Simulate |
| Bolt Box | Bonus buy | 25× | 96.70% | 100× | 1 in 690 | – | 1 in 2.50 | 0.83× base | Simulate |
| Bolt Box Blue | Bonus buy | 25× | 96.70% | 100× | 1 in 690 | – | 1 in 2.50 | 0.83× base | Simulate |
| Bolt Box Green | Bonus buy | 25× | 96.70% | 100× | 1 in 690 | – | 1 in 2.50 | 0.83× base | Simulate |
| Bolt Box Red | Bonus buy | 25× | 96.70% | 100× | 1 in 690 | – | 1 in 2.50 | 0.83× base | Simulate |
| Bolt Box Yellow | Bonus buy | 25× | 96.70% | 100× | 1 in 690 | – | 1 in 2.50 | 0.83× base | Simulate |
| Vs Ante | Bonus buy | 50× | 96.70% | 4,000× | 1 in 100,000 | 1 in 6.67 | 1 in 7.60 | 1.65× base | Simulate |
| Bonus | Bonus buy | 100× | 96.70% | 4,000× | 1 in 100,000 | – | 1 in 2.52 | 3.30× base | Simulate |
| Super Bonus | Bonus buy | 250× | 96.70% | 4,000× | 1 in 100,000 | – | 1 in 2.50 | 8.25× base | Simulate |
| Bolt Bonus | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Blue Blue | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Blue Green | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Blue Red | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Blue Yellow | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Green Blue | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Green Green | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Green Red | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Green Yellow | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Red Blue | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Red Green | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Red Red | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Red Yellow | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Yellow Blue | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Yellow Green | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Yellow Red | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Bolt Bonus Yellow Yellow | Bonus buy | 500× | 96.70% | 4,000× | 1 in 6,667 | – | 1 in 2.17 | 16.50× base | Simulate |
| Mega Duel | Bonus buy | 500× | 96.70% | 4,000× | 1 in 8,333 | – | 1 in 2.61 | 16.50× base | Simulate |
| Mega Duel Edison Pick | Bonus buy | 500× | 96.70% | 4,000× | 1 in 8,333 | – | 1 in 2.61 | 16.50× base | Simulate |
| Mega Duel Tesla Pick | Bonus buy | 500× | 96.70% | 4,000× | 1 in 8,333 | – | 1 in 2.61 | 16.50× 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 | 96.700% | Active |
Frequently asked
What is the RTP of Spark Duel?
Base spins return 96.70% of the amount wagered over the long run, from the published outcome table for version 2. All 28 of its bonus buys return 96.70%.
What is the max win in Spark Duel and how likely is it?
The top payout is 4,000× the base bet. On a base spin it lands 1 in 1,000,000 spins. In the Bolt Box buy (25×) 100× lands 1 in 690 buys.
Does Spark Duel have a bonus buy, and what does it cost?
Yes, 28 buy modes. Bolt Box: 25× the base bet, 96.70% RTP, an expected cost of 0.83× the base bet per buy. Bolt Box Blue: 25× the base bet, 96.70% RTP, an expected cost of 0.83× the base bet per buy. Bolt Box Green: 25× the base bet, 96.70% RTP, an expected cost of 0.83× the base bet per buy. Bolt Box Red: 25× the base bet, 96.70% RTP, an expected cost of 0.83× the base bet per buy. Bolt Box Yellow: 25× the base bet, 96.70% RTP, an expected cost of 0.83× the base bet per buy. Vs Ante: 50× the base bet, 96.70% RTP, an expected cost of 1.65× the base bet per buy. Bonus: 100× the base bet, 96.70% RTP, an expected cost of 3.30× the base bet per buy. Super Bonus: 250× the base bet, 96.70% RTP, an expected cost of 8.25× the base bet per buy. Bolt Bonus: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Blue Blue: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Blue Green: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Blue Red: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Blue Yellow: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Green Blue: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Green Green: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Green Red: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Green Yellow: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Red Blue: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Red Green: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Red Red: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Red Yellow: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Yellow Blue: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Yellow Green: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Yellow Red: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Bolt Bonus Yellow Yellow: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Mega Duel: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Mega Duel Edison Pick: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy. Mega Duel Tesla Pick: 500× the base bet, 96.70% RTP, an expected cost of 16.50× the base bet per buy.
Is Spark Duel high or low volatility?
Low. Its base-mode standard deviation is 8.5× 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.