Otto's Wild Wash slot: RTP and max win
Otto's Wild Wash is a high-volatility slot by Rinsed Gaming on Stake Engine, released 15 Sep 2026. Its base game returns 96.00%, below the median Engine slot (96.02%). The top payout is 15,000× the bet, bigger than 50% of Engine slots; from a base spin it lands about once every 1,290,323 spins. It has 4 bonus buys priced at 20× to 300× the bet; the best returns 96.00%, so each buy costs 0.80× the bet on average over the long run. It is the No. 4486 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 v9. "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% | 15,000× | 1 in 1,290,323 | 1 in 3.33 | 1 in 7.38 | 0.04× base | Simulate |
| High Pressure | Boosted spin | 3.00× | 96.00% | 15,000× | 1 in 769,231 | 1 in 1.54 | 1 in 4.66 | 0.12× base | Simulate |
| Full Pressure | Boosted spin | 5.00× | 96.00% | 15,000× | 1 in 3,636,364 | 1 in 3.22 | 1 in 5.99 | 0.20× base | Simulate |
| Foam Flood | Bonus buy | 20× | 96.00% | 15,000× | 1 in 81,633 | – | 1 in 4.43 | 0.80× base | Simulate |
| Bubble Rush | Bonus buy | 100× | 96.00% | 15,000× | 1 in 16,871 | 1 in 1.02 | 1 in 4.69 | 4.00× base | Simulate |
| Mystery Wash | Bonus buy | 300× | 96.00% | 15,000× | 1 in 2,500 | 1 in 1.14 | 1 in 9.07 | 12.00× base | Simulate |
| Super Bubble Rush | Bonus buy | 300× | 96.00% | 15,000× | 1 in 5,690 | – | 1 in 5.70 | 12.00× base | Simulate |
Work out the cost of Otto's Wild Wash 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 | |
|---|---|---|
| v9 | 96.000% | Active |
Frequently asked
What is the RTP of Otto's Wild Wash?
Base spins return 96.00% of the amount wagered over the long run, from the published outcome table for version 9. All 4 of its bonus buys return 96.00%.
What is the max win in Otto's Wild Wash and how likely is it?
The top payout is 15,000× the base bet. On a base spin it lands 1 in 1,290,323 spins. In the Foam Flood buy (20×) 15,000× lands 1 in 81,633 buys.
Does Otto's Wild Wash have a bonus buy, and what does it cost?
Yes, 4 buy modes. Foam Flood: 20× the base bet, 96.00% RTP, an expected cost of 0.80× the base bet per buy. Bubble Rush: 100× the base bet, 96.00% RTP, an expected cost of 4.00× the base bet per buy. Mystery Wash: 300× the base bet, 96.00% RTP, an expected cost of 12.00× the base bet per buy. Super Bubble Rush: 300× the base bet, 96.00% RTP, an expected cost of 12.00× the base bet per buy.
Is Otto's Wild Wash high or low volatility?
High. Its base-mode standard deviation is 32.6× 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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