Seven slot machines, taken apart
Seven of Britain's most played online slot machines, each with a specification and a step-by-step account of how it works.
By Ryan Jessop. Last checked .
Key takeaways
- Best RTP: Big Bass Bonanza, 96.71%.
- Gentlest: Starburst.
- Two pays-anywhere machines.
- Figures confirmed against two sources.
The seven
96.71% RTPBig Bass BonanzaA fishing slot whose free spins have a fisherman collecting cash values from fish.96.09% RTPStarburstA gem slot that pays both ways, with expanding wilds that re-spin.Varies by version (96.48% to 96.51% quoted) RTPSweet BonanzaA candy grid with tumbling wins and multiplier bombs in free spins.96.50% RTPGates of OlympusA pays-anywhere grid where multiplier orbs can land on any spin.96.21% RTPBook of DeadTen lines, one expanding symbol and very high swings.96.12% RTPFishin' FrenzyThe original fishing slot, with a simple free games feature.95.39% RTPFluffy FavouritesA soft-toy slot with tripled free games and a pick feature.
Specifications
| Slot | Developer | RTP | Volatility | Max win | Layout |
|---|---|---|---|---|---|
| Big Bass Bonanza | Pragmatic Play | 96.71% | High | 2,100x | 5 reels, 3 rows |
| Starburst | NetEnt | 96.09% | Low | 500x | 5 reels, 3 rows |
| Sweet Bonanza | Pragmatic Play | Varies by version (96.48% to 96.51% quoted) | High | 21,100x | 6 reels, 5 rows |
| Gates of Olympus | Pragmatic Play | 96.50% | High | 5,000x | 6 reels, 5 rows |
| Book of Dead | Play'n GO | 96.21% | High | 5,000x | 5 reels, 3 rows |
| Fishin' Frenzy | Blueprint Gaming | 96.12% | Medium to high | 5,000x | 5 reels, 3 rows |
| Fluffy Favourites | Eyecon | 95.39% | High | 5,000x | 5 reels, 3 rows |
Head to head
- Starburst vs Book of Dead
- Big Bass Bonanza vs Fishin' Frenzy
- Gates of Olympus vs Sweet Bonanza
- Starburst vs Big Bass Bonanza
- Book of Dead vs Gates of Olympus
- Fluffy Favourites vs Fishin' Frenzy
- Sweet Bonanza vs Big Bass Bonanza
- Starburst vs Gates of Olympus
Feature by feature
| Slot | Main feature | Volatility |
|---|---|---|
| Big Bass Bonanza | Cash collect | High |
| Starburst | Expanding wild re-spins | Low |
| Sweet Bonanza | Tumbles and multiplier bombs | High |
| Gates of Olympus | Multiplier orbs | High |
| Book of Dead | Expanding symbol | High |
| Fishin' Frenzy | Cash collect | Medium to high |
| Fluffy Favourites | Free games and a pick bonus | High |
Go further: The bell symbol, Loose and tight slot machines and The history of online slots.
Slot figures are developers' published defaults, each confirmed against two sources; the version at your casino can differ. UK land-based stake and prize limits and online rule dates were checked against Gambling Commission and licensing authority sources on 6 October 2026. History follows commonly cited accounts. Offer terms dated 5 October 2026. How we check. 18+. Free help: 0808 8020 133 or safer gambling.
Frequently asked questions
Which slot has the best RTP?
Of these, Big Bass Bonanza.
Which is best for beginners?
Starburst.
Are the figures exact?
They are developers' defaults.