Ava Studio · Slot release
Sphere City
Sphere City is a cosmic-themed slot from Ava Studio, built around a glowing glass orb, with a 95.38% base RTP, a 10,000x maximum win and two bonus buys.
By the Reel Bulletin desk · Updated 5 Nov 2026
A glassy orb with a golden starburst at its core, ringed by two gold bands, floats among violet and blue sparks and jagged streaks of light. It is an abstract, glittering look rather than a story-driven one. Ava Studio released the game on Stake in March 2026.
The base game returns 95.38% and can pay up to 10,000x the bet, with medium volatility. Two buys keep the same ceiling: the Bonus buy at 100x the bet (95.37%) and the Super buy at 300x (95.42%). The pricier option returns marginally more than the base game, while the cheaper one sits a hair below it, so the gap between the three modes is small.
Wondering how a session of Sphere City tends to go? RTPDaily works out session odds from its sampled maths.
Every way to play
Price and top win as multiples of the bet
| Mode | Price | RTP | Top win | Top win odds |
|---|---|---|---|---|
| Base · Base game | 1x | 95.38% | 10,000x | 1 in 952,381 |
| Bonus buy · Bonus buy | 100x | 95.37% | 10,000x | 1 in 2,002 |
| Super buy · Bonus buy | 300x | 95.42% | 10,000x | 1 in 313 |
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