RAT LAB slot: RTP and max win
RAT LAB is a medium-volatility slot by RAT LAB on Stake Engine, released 1 Aug 2026. Its base game returns 91.93%, below the median Engine slot (96.02%). The top payout is 5,000× the bet; from a base spin it lands about once every 300,000 spins. It has 2 bonus buys priced at 100× to 175× the bet; the best returns 92.24%, so each buy costs 14× the bet on average over the long run. It is the No. 5323 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 v196. "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× | 91.93% | 5,000× | 1 in 300,000 | 1 in 3.11 | 1 in 16 | 0.08× base | Simulate |
| Bonus Basic | Bonus buy | 100× | 91.88% | 5,000× | 1 in 3,896 | 1 in 1.01 | 1 in 4.30 | 8.12× base | Simulate |
| Bonus Wild | Bonus buy | 175× | 92.24% | 5,000× | 1 in 9,434 | every round | 1 in 3.76 | 13.57× 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 | |
|---|---|---|
| v196 | 91.928% | Active |
| v192 | 91.928% | |
| v191 | 91.928% |
Frequently asked
What is the RTP of RAT LAB?
Base spins return 91.93% of the amount wagered over the long run, from the published outcome table for version 196. Its bonus buys return between 91.88% and 92.24%.
What is the max win in RAT LAB and how likely is it?
The top payout is 5,000× the base bet. On a base spin it lands 1 in 300,000 spins. In the Bonus Wild buy (175×) 5,000× lands 1 in 9,434 buys.
Does RAT LAB have a bonus buy, and what does it cost?
Yes, 2 buy modes. Bonus Basic: 100× the base bet, 91.88% RTP, an expected cost of 8.12× the base bet per buy. Bonus Wild: 175× the base bet, 92.24% RTP, an expected cost of 13.57× the base bet per buy.
Is RAT LAB high or low volatility?
Medium. Its base-mode standard deviation is 23.5× 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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