Sky Castle slot: RTP and max win
Sky Castle is a high-volatility slot by csx studio on Stake Engine, released 19 May 2026. Its base game returns 96.50%, above the median Engine slot (96.02%) and higher than 66% of them. The top payout is 10,000× the bet; from a base spin it lands about once every 8,931,140 spins. It has 3 bonus buys priced at 100× to 500× the bet; the best returns 96.50%, so each buy costs 3.50× the bet on average over the long run. It is the No. 3928 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 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× | 96.50% | 10,000× | 1 in 8,931,140 | 1 in 2.46 | 1 in 18 | 0.04× base | Simulate |
| Base Ic | Boosted spin | 3.00× | 96.50% | 10,000× | 1 in 100,785 | 1 in 1.45 | 1 in 72 | 0.11× base | Simulate |
| Bonus 1 | Bonus buy | 100× | 96.50% | 10,000× | 1 in 1,666 | every round | 1 in 4.22 | 3.50× base | Simulate |
| Bonus 2 | Bonus buy | 200× | 96.50% | 10,000× | 1 in 1,436 | every round | 1 in 3.44 | 7.00× base | Simulate |
| Bonus 3 | Bonus buy | 500× | 96.50% | 10,000× | 1 in 1,243 | every round | 1 in 3.16 | 17.50× 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 | 96.500% | Active |
Frequently asked
What is the RTP of Sky Castle?
Base spins return 96.50% of the amount wagered over the long run, from the published outcome table for version 2. All 3 of its bonus buys return 96.50%.
What is the max win in Sky Castle and how likely is it?
The top payout is 10,000× the base bet. On a base spin it lands 1 in 8,931,140 spins. In the Bonus 1 buy (100×) 10,000× lands 1 in 1,666 buys.
Does Sky Castle have a bonus buy, and what does it cost?
Yes, 3 buy modes. Bonus 1: 100× the base bet, 96.50% RTP, an expected cost of 3.50× the base bet per buy. Bonus 2: 200× the base bet, 96.50% RTP, an expected cost of 7.00× the base bet per buy. Bonus 3: 500× the base bet, 96.50% RTP, an expected cost of 17.50× the base bet per buy.
Is Sky Castle high or low volatility?
High. Its base-mode standard deviation is 38.2× 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.
Slots with similar math to Sky Castle
Matched on volatility, max win, RTP and whether there's a bonus buy. Not on theme.
Museum HeistCrimsonClover RTP96.50%Max win10,000×Volatility
Haaland Walk10000x RTP96.50%Max win10,000×Volatility
Ape Gangcsx studio RTP96.50%Max win10,000×Volatility
Pumpkin GobbleSally studios RTP96.50%Max win10,000×Volatility
Totem Poker ReelsNextPlay RTP96.50%Max win10,000×Volatility
AKUMUAzurio game RTP96.50%Max win10,000×Volatility