- 🎰 The best slots by bonus features, including reviews & free demo slots
- 🏛️ The top slot sites in the UK to play them at
- 🚀 Bonus features from progressive jackpot slots
- ⚡Nolimit City vs Pragmatic bonus frequency
Your Expert Guide
The Best Bonus Slots Features in the UK
With thousands of slot games to choose from, it’s hard to know where to begin. The slot games found at the top of slot sites are a good indication what is popular with players, and this is evident through various no wager free spins offers. Below, you’ll find 10 of the best bonus slots, with free-play versions so you can sample all the bonus features.
| Best For | Slot Name | Studio | RTP % | Volatility | Max Win ( x Bet) | Minimum Bet | Release Date |
|---|---|---|---|---|---|---|---|
| Free Spins | Big Bass Bonanza | Pragmatic Play | 96.71% | Medium-High | 2100 | £0.10 | 03/12/2020 |
| Expanding Wilds | Starburst | NetEnt | 96.09% | Low | 500 | £0.10 | 20/06/2012 |
| Expanding Symbols | Book of Dead | Play 'n GO | 96.21% | High | 5000 | £0.10 | 14/01/2016 |
| Cascading Reels/Tumbles | Bonanza Megaways | Big Time Gaming | 96.00% | Medium-High | 26000 | £0.20 | 07/12/2016 |
| Multipliers | Immortal Romance | Microgaming | 96.86% | Very High | 12150 | £0.30 | 01/12/2011 |
| Respins | Money Train 4 | Relax Gaming | 96.10% | Very High | 150000 | £0.10 | 20/09/2023 |
| Wild Multipliers | Dead or Alive 2 | NetEnt | 96.80% | Very High | 111111.11 | £0.09 | 23/04/2019 |
| Mystery Symbols | Razor Returns | Push Gaming | 96.55% | High | 100000 | £0.10 | 04/07/2023 |
| Trail Game | Dead Riders Trail | Relax Gaming | 96.20% | Very High | 50000 | £0.20 | 24/8/2022 |
| Hold and Spin | Le Pharaoh | Hacksaw Gaming | 96.18% | Medium-High | 15000 | £0.10 | 26/09/2024 |
1. Big Bass Bonanza: Best for Free Spins
- RTP: 96.71%
- Max Win: 2,100x
- Volatility: Medium-High
- Stakes: 10p to £5
- Release Date: 3 December 2020
Released in December 2020 and the first game in the Big Bass slots series, Big Bass Bonanza is appealing to players for many reasons. With a fun fishing theme, many sites have free spins offers on this iconic game. Played on 5 reels and 10 paylines from 10p per spin, a major reason why it’s a popular bonus slot is due to the Free Spins feature.
The Fisherman Wild comes into pay and collects Fish Money symbols on the reels. Fisherman Wilds also award additional free spins and increase the multiplier up to 10x which then applies to Fish Money symbols collected. With a high 96.71% RTP rate and 2,100 x bet max wins, you’ll trigger the Free Spins feature every 113 free spins on average.
You also have the similar Big Bass Splash: also with 5 reels and 10 paylines, it is easier, theoretically, it’s easy to trigger the feature with random extras in the base game. Pragmatic Play has added up to 5 modifiers before the free spins being: including more fish money symbols on the reels, more Fisherman Wilds, beginning at level 2 with a 2x multiplier, extra free spins and a higher chance of activating random extras. It also offers the same 96.71% RTP rate but higher 5,000 x bet max win potential.
2. Starburst: Best for Expanding Wilds
- RTP: 96.09%
- Max Win: 500x
- Volatility: Low
- Stakes: 10p to £5
- Release Date: 20 June 2012
One of the most popular slot games ever, NetEnt’s Starburst is a classic among classics. With 5 reels and 10 paylines, this simple outer space-themed juggernaut can be played from just 10p per spin. The focus is on the Starburst Wild symbol which lands on any of the 3 central reels. When it does, it expands to give you a wild reel (also known as expanding wild) and a free re-spin.
If more Starburst Wilds land, you’ll get another wild reel with another re-spin. With the possibility of 3 wild reels and Win Both Ways technology, 500 x your total bet can be won on each spin/re-spin. Hypnotic and mesmerising, a Starburst Wild symbol will land every 11.9 spins which makes it perfect for bonus hunting.
If you want bigger max win potential, Starburst XXXtreme (the sequel) also comes with expanding Starburst Wilds and re-spins with NetEnt adding multipliers up to 150x that can combine up to 450x. This can lead to 200,000 x bet max wins.
3. Book of Dead: Best for Expanding Symbols
- RTP: 96.21%
- Max Win: 5,000x
- Volatility: High
- Stakes: 10p to £5
- Release Date: 14 January 2016
Play ‘n GO’s Book of Dead is also up there as it’s been the subject of many a casino’s welcome offer. With an ancient Egyptian theme, this 5 reel, 10 payline game is all about the Free Spins feature. What draws players in is that a special expanding symbol is chosen before the feature begins.
When this symbol appears, it expands to take over the whole reel. The more reels it appears on, the bigger the win potential. If a high-value symbol is chosen, wins of up to 5,000 x bet can be won on every free spin. What makes Book of Dead’s bonus feature so engaging is the hope you’ll land Rich Wilde as the special expanding symbol. This is the reason why ‘Book of’ slots are so popular.
4. Bonanza Megaways: Best for Cascades/Tumbles
- RTP: 96%
- Max Win: 26,000x
- Volatility: Medium-High
- Stakes: 20p to £5
- Release Date: 7 December 2016
Created by Big Time Gaming, Bonanza Megaways is the game that put Megaways on the map. With 6 reels and up to 117,649 ways to win, this mining-themed slot sees you dig for gold. With Reactions (also known as Cascades, Cascading Reels or Tumbles) awarding continuous spins, the focus is the Free Spins feature.
Beginning with a 1x multiplier, each Reaction/cascade/win increases the win multiplier by 1. With no limit to how high the win multiplier can go, you can retrigger the feature infinitely for unlimited free spins. Bonanza has a 96% RTP rate and 26,000 x bet max wins with the exciting bonus feature the key to landing big wins. It may be simple with countless other Megaways slots copying it but Bonanza still remains the favourite.
New customers only. Deposit and wager £20 on Midnite Casino to get 100 Free Spins at 10p per spin, valid for 7 days on selected games. T&Cs apply. 18+ GambleAware.org
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5. Immortal Romance: Best for Multipliers
- RTP: 96.86%
- Max Win: 12,150x
- Volatility: Very High
- Stakes: 30p to £4.50
- Release Date: 1 December 2011
Created by Microgaming (now Games Global), Immortal Romance is an iconic slot that is based on vampires. With 5 reels and 243 ways to win, it comes with a very high 96.86% RTP rate and one of the best soundtracks you’ll ever hear in a slot game.
The game is all about the iconic The Chamber of Spins. The more times you trigger it, the more free spins features you can choose from. With 4 available, there offer 5x multipliers, Vampire Bat multipliers up to 6x, Rolling Reels with an increasing multiplier up to 5x and Wine Vine symbols which give you wilds. Offering 12,150 x bet max wins, Immortal Romance is a challenge that remains as popular today as when first released in December 2011.
New cust only. Opt in & deposit £10+ in 7 days & wager 1x in 7 days on any eligible casino game (excluding live casino and table games) for 50 Free Spins. Wagering contributions vary. Free Spins worth 10p each on Big Bass Splash. 3 day expiry. 18+. T&Cs apply.
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6. Money Train 4: Best for Respins
- RTP: 96.1%
- Max Win: 150,000x
- Volatility: Very High
- Stakes: 10p to £5
- Release Date: 20 September 2023
Created by Relax Gaming, Money Train 4 is the last in the iconic series. Played on a 6x6 grid with Scatter Pays, you join the bandits on their last ride of the rails in a dystopian futuristic setting.
Focusing on the Money Cart Bonus feature which is a respins bonus game, Relax Gaming has added a new bandit and more special symbols which results in more explosive combinations. With 20 special symbols in total, you can win up to 150,000 x your total bet from the feature making it a bonus slot many try to conquer.
7. Dead or Alive 2: Best for Wild Multipliers
- RTP: 96.8%
- Max Win: 111,111.11x
- Volatility: Very High
- Stakes: 9p to £5
- Release Date: 23 April 2019
Dead or Alive 2 is a very high volatility Wild West slot from NetEnt with 5 reels and 9 paylines. With a high 96.8% RTP rate, the iconic game focuses on its 3 free spins features: Train Heist, Old Saloon and High Noon Saloon.
Offering sticky wilds and multipliers, the High Noon Saloon Free Spins feature is my favourite as landing 2 or 3 wilds on the same reel will see them transform into 2x or 3x multiplier wilds. Several multiplier wilds multiply each other and there is a chance of sticky wilds, for up to 111,111.11 x bet max win potential.
New players only | Deposit & wager at least £10 to get free spins | Free Spins winnings are cash | No max cash out | Eligibility is restricted for suspected abuse | Skrill deposits excluded | Free Spins value £0.20 per spin | Free Spins expire in 48 hours |
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8. Razor Returns: Best for Mystery Symbols
- RTP: 96.55%
- Max Win: 100,000x
- Volatility: High
- Stakes: 10p to £5
- Release Date: 4 July 2023
Razor Returns is a high volatility underwater sequel to Razor Shark from Push Gaming with 5 reels and 40 fixed paylines. Boasting a high 96.55% RTP rate, it comes with plenty of bonus features including Nudge & Reveal, Razor Reveal, free spins, multipliers and instant prizes.
Key to the action are Mystery symbols which play a huge part in the Nudge & Reveal feature. Transforming into the same symbol, a Great White Wild or a Golden Shark, mystery symbols nudge down their reels 1 row at a time until disappearing from the reels. If they transform into Golden Sharks, you’ll play the Razor Reveal feature: they can award multipliers, collectors, converters, Torpedo Scatters (to trigger the free spins) and instant prizes up to 5,000 x bet. All in all, it comes with 100,000 x bet max win potential.
9. Dead Riders Trail: Best for Trail Game
- RTP: 96.2%
- Max Win: 50,000x
- Volatility: Very High
- Stakes: 20p to £5
- Release Date: 24 August 2022
Dead Riders Trail is a very high volatility biker-themed slot from Relax Gaming played on 6 reels and up to 46,656 ways to win. Wins trigger cascades that clear blocker tiles and can unlock a Feature Wheel awarding free spins or entry into Bonus/Super Bonus Trail features.
In the Bonus Trail and Super Bonus Trail features, you move up the trail to reveal bet multiplier prizes or a wide range of modifiers that can double and add value to bet multipliers, as well as persistent modifiers which apply on every spin. Max win potential is 50,000 x your total bet.
10. Le Pharaoh: Best for Hold and Spin
- RTP: 96.18%
- Max Win: 15,000x
- Volatility: Medium
- Stakes: 10p to £5
- Release Date: 26 September 2024
Le Pharaoh is an ancient Egypt-themed slot from Hacksaw Gaming played on 6 reels with 19 fixed paylines. The game’s key mechanics include Sticky Redrops, Golden Riches multipliers up to 500x, and a Bonus Choice offering various free spins and lives-based features.
With 15,000 x bet max wins, it’s all about landing coins which stick in position: this is an essential element of Hold and Spin slots. You’ll find the same feature in most ‘Le’ series slots.
Jackpot Slots Bonus Features
Whilst the above slot games are the most popular bonus slots, you should also consider progressive jackpot slots. Normally randomly-triggered, jackpot features give you the chance to win a 7 or even 8-figure progressive jackpot.
Whilst the odds of winning a jackpot are extremely low, the biggest ever progressive jackpot win is an astonishing €38.4 million! The chance to win big keeps players coming back time and time again. Below are 2 of the best bonus jackpot slots in the UK:
Mega Moolah
Real-Time Jackpot: £6,858,250.29
- RTP: 93.42%
- Max Win: 1955x
- Volatility: Low
- Stakes: 25p to £5
- Release Date: 30 November 2006
Released by Microgaming in November 2006, Mega Moolah is an African safari-themed game with 5 reels and 25 paylines. With doubling wild wins and free spins with a multiplier up to 6x, the appeal is the Progressive Jackpot Bonus feature which is triggered randomly on any spin.
You then spin a wheel to win 1 of the 4 progressive jackpots. If you land the Mega Jackpot, you are guaranteed to win at least £2 million with an average of €6.69 million every 49 days. Due to it’s popularity, Games Global (formerly Microgaming) have a fully-fledged Mega Moolah slot series which all give you the chance to win jackpots.
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Age of the Gods
- RTP: 95.02%
- Max Win: 50,000x
- Volatility: Medium to High
- Stakes: 20p to £5
- Release Date: 11 July 2016
Created by Playtech, Age of the Gods is a popular choice. With a Greek mythology theme and set in Mount Olympus, this 5 reel 20 payline game comes with 4 free spins features based on ancient Greek deities.
Offering multipliers up to 5x, increasing multipliers, stacked wild reels and wild symbol transformations, you can play various features in one sitting as long as you don’t unveil Hades. You also have the added extras of 4 progressive jackpots with the Ultimate Power Jackpot awarding an average £499,000 every 44 days. In fact, all Age of the Gods series slots offer you the chance to win these jackpots.
Nolimit City vs Pragmatic Play Bonus Frequency
Old-school classic slots or 3-reel games are not as popular as bonus slots due to the excitement and win potential offered in the latter. Whilst we’ve outlined the most popular choices above, only 2 slot studios provide stats on the frequency of triggering the main bonus feature (which is free spins in the majority of cases).
In this section, we look at the bonus feature frequency rates from both Nolimit City and Pragmatic Play slots. First, we begin with Nolimit City:
Nolimit City Bonus Slots
Nolimit City slots are known for being extremely volatile with controversial, unique themes and graphics as well as innovative in-house mechanics and high win potential.
Whilst other slot games are ‘easier to bonus’, the challenge of triggering the main bonus feature is a feat many players find appealing. When looking at the hit frequency into the main bonus feature (i.e. free spins) for all their slot games, here is what we found:
- Highest Hit Frequency: 1 in 13 Spins into the Candle Spins feature in Blood and Shadow
- Lowest Hit Frequency: 1 in 398 Spins into the Pre-Ops or Annihilations Spins features in Disturbed
- 1 in 191 Average Hit Frequency across 99 slot games with a bonus feature
xBet Enabled!
Pragmatic Play Bonus Slots
Probably the most popular slot studios around, there are hundreds of Pragmatic Play slots to choose from. Offering a variety of mechanics, themes, bonus features and extras, below you’ll find the slot games with the highest and low hit frequency as well as the average across 380+ titles:
- Highest Hit Frequency: 1 in 20.24 Spins into the Respin feature in Star Pirates Code
- Lowest Hit Frequency: 1 in 510 Spins into the Free Spins feature in Spin & Score Megaways
- 1 in 229 Average Hit Frequency across 380+ slot games with a bonus feature
Pros and Cons of Slot Bonus Features
Wondering what are the positives and negatives of slot game bonus features? I've summed them up for you:
Pros
- Bonus features are exciting and can lead to big wins
- Most slots these days are all about their bonus features
- The bigger wins will come from the bonus features
- Studios combine various bonus features in 1 to make the games exciting
Cons
- You may not trigger a bonus feature at all (all down to luck)
- Triggering a bonus feature doesn’t mean you’ll win
- Many slot bonus features are not unique
Slots Bonus Features FAQs
FAQ
Slots Bonus Features FAQs
What are bonus features in slots?
Bonus features in slot games are extras that you can trigger during the game to enhance your winning potential and/or experience. The most common is a Free Spins feature where you get free turns.
What are the best slots bonus features?
The best bonus features in slots include free spins, multipliers, respins, expanding wilds and cascades. I list a top game for each bonus feature.
Is free spins the most popular bonus feature in slot games?
Yes: most slot games have a Free Spins feature of some variety which often include other bonus features such as expanding wilds, multipliers, wild multipliers, mystery symbols and expanding symbols.
How do Bonus Buy slots work?
Outside the UK, players can buy their way into a slot’s bonus feature. Typically, this will cost around 100 x your total bet. In the UK, this is not permitted.
How do I choose a bonus feature for me?
To choose a suitable slot bonus feature, play a variety of slot games in demo mode to see which features you like. I’ve broken down the most popular slot bonus features with a recommended game for each.
How often do bonus features trigger?
Known as the bonus frequency rate, bonus features trigger randomly, For free spins bonus features, it will typically trigger every 100-300 spins. This depends on how volatile the game is and how high the max win potential is.
