SEWER SHELLBACKS slot: RTP and max win
SEWER SHELLBACKS is a medium-volatility slot by NOCAP LABS on Stake Engine, released 20 Aug 2026. Its base game returns 96.00%, below the median Engine slot (96.02%). The top payout is 20,000× the bet, bigger than 59% of Engine slots; from a base spin it lands about once every 10,000,000 spins. It has 5 bonus buys priced at 100× to 500× the bet; the best returns 95.52%, so each buy costs 16× the bet on average over the long run. It is the No. 1998 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 v7. "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× | 96.00% | 20,000× | 1 in 10,000,000 | 1 in 4.02 | 1 in 10 | 0.04× base | Simulate |
| The Hunt | Boosted spin | 3.00× | 95.67% | 20,000× | 1 in 3,333,333 | 1 in 3.85 | 1 in 7.52 | 0.13× base | Simulate |
| Day 2 | Boosted spin | 6.00× | 95.52% | 20,000× | 1 in 1,666,667 | 1 in 1.54 | 1 in 3.68 | 0.27× base | Simulate |
| Hun | Bonus buy | 100× | 95.52% | 20,000× | 1 in 100,000 | 1 in 1.05 | 1 in 6.98 | 4.48× base | Simulate |
| Day 64 | Bonus buy | 150× | 95.52% | 20,000× | 1 in 66,667 | 1 in 1.54 | 1 in 4.54 | 6.72× base | Simulate |
| Mystery | Bonus buy | 220× | 95.52% | 20,000× | 1 in 45,455 | 1 in 2.00 | 1 in 6.24 | 9.86× base | Simulate |
| Sni | Bonus buy | 350× | 95.52% | 20,000× | 1 in 28,571 | every round | 1 in 7.41 | 15.67× base | Simulate |
| Day 512 | Bonus buy | 500× | 95.52% | 20,000× | 1 in 20,001 | every round | 1 in 7.46 | 22.40× base | Simulate |
Work out the cost of SEWER SHELLBACKS 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 | |
|---|---|---|
| v7 | 95.998% | Active |
| v4 | 95.998% | |
| v3 | 95.998% |
Frequently asked
What is the RTP of SEWER SHELLBACKS?
Base spins return 96.00% of the amount wagered over the long run, from the published outcome table for version 7. All 5 of its bonus buys return 95.52%.
What is the max win in SEWER SHELLBACKS and how likely is it?
The top payout is 20,000× the base bet. On a base spin it lands 1 in 10,000,000 spins. In the Sni buy (350×) 20,000× lands 1 in 28,571 buys.
Does SEWER SHELLBACKS have a bonus buy, and what does it cost?
Yes, 5 buy modes. Hun: 100× the base bet, 95.52% RTP, an expected cost of 4.48× the base bet per buy. Day 64: 150× the base bet, 95.52% RTP, an expected cost of 6.72× the base bet per buy. Mystery: 220× the base bet, 95.52% RTP, an expected cost of 9.86× the base bet per buy. Sni: 350× the base bet, 95.52% RTP, an expected cost of 15.67× the base bet per buy. Day 512: 500× the base bet, 95.52% RTP, an expected cost of 22.40× the base bet per buy.
Is SEWER SHELLBACKS high or low volatility?
Medium. Its base-mode standard deviation is 18.8× 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.
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