Sphere City slot: RTP and max win
Sphere City is a high-volatility slot by AVA STUDIO on Stake Engine, released 25 Mar 2026. Its base game returns 95.38%, below the median Engine slot (96.02%). The top payout is 10,000× the bet; from a base spin it lands about once every 952,381 spins. It has 2 bonus buys priced at 100× to 300× the bet; the best returns 95.42%, so each buy costs 14× the bet on average over the long run. It is the No. 6307 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× | 95.38% | 10,000× | 1 in 952,381 | 1 in 3.66 | 1 in 15 | 0.05× base | |
| Bonus Buy | Bonus buy | 100× | 95.37% | 10,000× | 1 in 2,002 | 1 in 1.01 | 1 in 6.24 | 4.63× base | Simulate |
| Super Buy | Bonus buy | 300× | 95.42% | 10,000× | 1 in 313 | 1 in 1.01 | 1 in 5.14 | 13.75× base | Simulate |
Work out the cost of Sphere City 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 | |
|---|---|---|
| v2 | 95.375% | Active |
Frequently asked
What is the RTP of Sphere City?
Base spins return 95.38% of the amount wagered over the long run, from the published outcome table for version 2. Its bonus buys return between 95.37% and 95.42%.
What is the max win in Sphere City and how likely is it?
The top payout is 10,000× the base bet. On a base spin it lands 1 in 952,381 spins. In the Super Buy buy (300×) 10,000× lands 1 in 313 buys.
Does Sphere City have a bonus buy, and what does it cost?
Yes, 2 buy modes. Bonus Buy: 100× the base bet, 95.37% RTP, an expected cost of 4.63× the base bet per buy. Super Buy: 300× the base bet, 95.42% RTP, an expected cost of 13.75× the base bet per buy.
Is Sphere City high or low volatility?
High. Its base-mode standard deviation is 29.0× 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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