Flex Check slot: RTP and max win
Flex Check is a low-volatility slot by Backroom Studios on Stake Engine, released 22 Oct 2026. Its base game returns 95.80%, 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 4,817,250 spins. It has 5 bonus buys priced at 48× to 1,500× the bet; the best returns 95.80%, so each buy costs 2.00× the bet on average over the long run. It is the No. 2766 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 v4. "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× | 95.80% | 15,000× | 1 in 4,817,250 | 1 in 2.83 | 1 in 13 | 0.04× base | Simulate |
| Flex Rush | Bonus buy | 48× | 95.80% | 15,000× | 1 in 2,286,506 | – | 1 in 3.47 | 2.00× base | Simulate |
| Receipt Run | Bonus buy | 85× | 95.80% | 15,000× | 1 in 3,152,950 | – | 1 in 2.54 | 3.57× base | Simulate |
| Proof Check | Bonus buy | 175× | 95.80% | 15,000× | 1 in 2,000,000 | – | 1 in 4.73 | 7.35× base | Simulate |
| Status Lock | Bonus buy | 750× | 95.80% | 15,000× | 1 in 1,000,542 | – | 1 in 3.12 | 31.50× base | Simulate |
| Max Flex | Bonus buy | 1,500× | 95.80% | 15,000× | 1 in 118 | 1 in 2.17 | 1 in 2.17 | 63.00× 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 | |
|---|---|---|
| v4 | 95.800% | Active |
Frequently asked
What is the RTP of Flex Check?
Base spins return 95.80% of the amount wagered over the long run, from the published outcome table for version 4. All 5 of its bonus buys return 95.80%.
What is the max win in Flex Check and how likely is it?
The top payout is 15,000× the base bet. On a base spin it lands 1 in 4,817,250 spins. In the Flex Rush buy (48×) 15,000× lands 1 in 2,286,506 buys.
Does Flex Check have a bonus buy, and what does it cost?
Yes, 5 buy modes. Flex Rush: 48× the base bet, 95.80% RTP, an expected cost of 2.00× the base bet per buy. Receipt Run: 85× the base bet, 95.80% RTP, an expected cost of 3.57× the base bet per buy. Proof Check: 175× the base bet, 95.80% RTP, an expected cost of 7.35× the base bet per buy. Status Lock: 750× the base bet, 95.80% RTP, an expected cost of 31.50× the base bet per buy. Max Flex: 1,500× the base bet, 95.80% RTP, an expected cost of 63.00× the base bet per buy.
Is Flex Check high or low volatility?
Low. Its base-mode standard deviation is 10.2× 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.
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