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Double Bubble (Roxor Gaming) – Review & Demo Play
Double Bubble from Roxor Gaming play free demo version ▶ Casino Slot Review Double Bubble ✔ Return (RTP) of online slots on August 2026 and play for real money✔
- Substantially revised the review, adding new stats like 10,000x max win, a pros-and-cons summary, and updated details on the bonus round and symbols.
Pros
- Clean five-reel layout with steady medium variance
- Shark Wild pays a heavy 10,000x for five
- Simple free spins round with doubling feature
- RTP of 96.02% sits above the reference point
Cons
- Dated visuals feel old-fashioned on a modern screen
- Feature set is thin with few side games
- Bonus win capped at 500x limits ceiling
- The balance readout is cramped on smaller handsets
First look at Double Bubble
Double Bubble runs on a 5x3 grid with 20 fixed paylines and a sea theme built around a shark Wild and gold coin Scatters. Released back in 2006, it has kept a loyal UK following through simple mechanics and medium volatility. The RTP is 96.02% and the top line pays 10,000x stake.
Testing on a handset, the first impression is functional rather than polished. The reels fill the portrait viewport cleanly, but the artwork shows its age. Colours are bold, the fish symbols are clear, and the tap targets on the reels area respond without fuss. It feels like a machine built for touch long after its original design.
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Reading the reels and symbols
Three premium symbols carry the paytable: a red pufferfish, a glowing blue seahorse and a yellow tropical character. Beneath them sit the card ranks A, K, Q, J and 10 as low payers. The visual hierarchy holds up on a small screen, though the card symbols blur slightly at the edges of the grid in portrait mode.
The shark is the Wild and the most valuable icon on the reels. It substitutes for everything except the Scatter and pays 10,000x your stake for five on an active payline. The gold coin is the Scatter, described in game as a wonky coin, and it is the only trigger for the free spins round.
Symbols and payouts
| 5 | x10000 |
The bonus engine of Double Bubble
Three, four or five gold coin Scatters award ten free spins. During the round, landing the Double Bubble symbol on the centre reel doubles the amount shown in the total feature win box. That doubling is where the swings come from, and it is the only real mechanic worth chasing in this game.
A hard cap sits on the round: the feature win is limited to 500x your stake. Any remaining spins are discarded once that ceiling is hit. Additional coins landing mid-bonus will not re-trigger more spins, though they still pay their Scatter value. It keeps the maths tidy but takes some drama out of a strong run.
Bonus features
RTP and volatility behaviour
Double Bubble runs at 96.02% RTP with medium volatility, sitting just above the 96% mark. Some operators deploy lower RTP variants, so check the game menu before you spin. The max win reaches 10,000x stake through five sharks, which on a £100 stake equates to the £100,000 ceiling quoted for the game.
Medium variance means base-game hits arrive at a fair pace without long dry runs. The larger swings are carried by the free spins and the centre-reel doubling. On mobile the balance readout is cramped on smaller handsets, and I had to look twice to confirm a win value after a fast spin, which is not ideal at speed.
FAQ
How many free spins does the bonus round award?
What does the Double Bubble symbol do during free spins?
Why is the free spins payout limited?
How much does the shark Wild pay?
How does Double Bubble compare to Blazing Riches?
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Gallery of video and screenshots of the game
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References
Our editorial team
All our content is written by our editorial team and checked before publication. We play the games ourselves, verify licences and withdrawal terms, and update every review as soon as something changes.
Under the supervision of Editor-in-Chief Mark Rylance