20+ years in the gambling industry including 13+ years playing and reviewing slots.
Whether you're a fan of intergalactic adventures, dazzling galaxies, sci-fi warfare or alien creatures, space-themed slots continue to dominate the reels in 2025. These cosmic slot games offer bold graphics, exhilarating bonus features and big win potential.
In my guide, you get to explore the top space slots available at UK slot sites. There is a focus on key bonus features, volatility, RTP rates and max win potential as well as the ability to try for free via free demo slots. I’ve picked all-time favourites, new releases, varying mechanics and dazzling visuals to suit every kind of space explorer.
Top 10 Space-Themed Slots
Allowing you to step into the unknown, my best space-themed slots are from trusted slot providers including NetEnt, Play ‘n GO, Big Time Gaming, Nolimit City and Hacksaw Gaming (amongst others). You’ll get to discover unknown planets, meet alien creatures and travel through galaxies for an immersive experience. I begin with one of the most iconic slot games ever, Starburst.
| # | Slot Game | Provider | RTP | Volatility | Max Win (x Bet) | Minimum Bet | Release Date |
|---|---|---|---|---|---|---|---|
| 1 | Starburst | NetEnt | 96.09% | Low | 500 | £0.10 | 20/06/2012 |
| 2 | Reactoonz | Play 'n GO | 96.51% | Very High | 4570 | £0.20 | 23/10/2017 |
| 3 | Reapers | Print Studios | 96.47% | Very High | 20000 | £0.20 | 13/12/2022 |
| 4 | Max Megaways 2 | Big Time Gaming | 96.64% | Very HIgh | 147620 | £0.20 | 26/07/2023 |
| 5 | Space Miners | Relax Gaming | 96.47% | High | 50000 | £0.10 | 08/02/2022 |
| 6 | Fire My Laser | Hacksaw Gaming | 96.31% | Medium | 15000 | £0.10 | 19/12/2024 |
| 7 | Brute Force | Nolimit City | 96.08% | Extreme | 40000 | £0.20 | 08/10/2024 |
| 8 | Invaders Megaways | Light & Wonder | 96.30% | High | 75798 | £0.25 | 15/06/2021 |
| 9 | Space Donkey | Nolimit City | 96.07% | High | 14649 | £0.20 | 03/10/2023 |
| 10 | Star Clusters Megaclusters | Big Time Gaming | 96.54% | Medium-High | 23960 | £0.20 | 26/08/2020 |
1. Starburst (NetEnt)
- RTP: 96.09%
- Max Win: 500x
- Volatility: Low
- Stakes: 10p to £5
- Release Date: 20 June 2012
Released in June 2012 by NetEnt, Starburst is the most popular space-themed slot game of all time. In fact, it’s arguably one of the most played games ever. With 5 reels and 10 paylines, you can reach for the starts from just 10p per spin.
In terms of the gameplay, it uses Win Both Ways technology meaning winning combinations are formed from left to right as well as right to left. With mesmerising graphics and animations, the focus is on Starburst Wilds which land on any of the 3 middle reels.
When they land, they expand to award a wild reel as well as a free re-spin. If another Starburst Wild lands, you’ll benefit from another wild reel. You can repeat this process for up to 3 wild reels.
With a 96.09% RTP rate, Starburst comes with 500 x bet max wins. It may not be the highest-paying game on my list but it’s cemented it’s place in slots history. NetEnt has also created 2 sequels which offer much higher win potential: Starburst XXXtreme comes with 200,000 x bet max wins and Starburst Galaxy offers 25,000 x bet payouts.
- No. of slots 1000+
- Payout speed Instant Options
- Win rate 96.5%
- Mobile-first Casino With Instant Withdrawals
- 6 minute withdrawals
Due to Starburst’s popularity, many slot sites and casinos have Starburst no wagering free spins offers. Check them all out below:
Best Free Spins No Wagering Offers 2025
2. Reactoonz (Play ‘n GO)
- RTP: 96.51%
- Max Win: 4,570x
- Volatility: Very High
- Stakes: 20p to £5
- Release Date: 23 October 2017
Released in October 2017, Reactoonz is by Play ‘n GO and takes you on an interstellar adventure with alien creatures. Played on a 7x7 grid with Cluster Pays, the minimum bet is 20p a spin. Its quirky, fun and fast-paced.
Every win awards cascades which in turn charge the Quantum Leap meters which activate several bonus features: they transform wilds, destroy symbols, award diagonal lines of matching symbols and bring Vortex Wilds onto the grid. If you manage to charge all meters, the Gargantoon feature is triggered with a 3x3 wild added to the grid. It then splits into two 2x2 wilds and nine 1x1 wilds for each cascades.
With more bonus features, Reactoonz comes with a high 96.51% RTP rate and 4,570 x bet max wins. Due to it’s popularity, Play ‘n GO has gone on to create a whole Reactoonz slots series.
- No. of slots 1850+
- Payout speed Instant Options
- Win rate Variable
- Independent Casino With Unique Design
- Top Class Slot Games
If you want more Cluster Pays slots, check out the top 10 games which include the likes of Jammin’ Jars, Cluster Tumble, Hand of Anubis and Tarasque.
The Best Cluster Pays Slots to Play in the UK
3. Reapers (Print Studios)
- RTP: 96.47%
- Max Win: 20,000x
- Volatility: Very High
- Stakes: 20p to £5
- Release Date: 13 December 2022
Released in December 2022, Reapers is from Print Studios and is played on an 8x8 grid with Cluster Pays. With the minimum bet at 20p a spin, it’s set in a distant galaxy on a planet colonised by Earth. For reference, Reapers are semi-automatic drones who collect valuable energy cells.
With a futuristic feel, your aim is to unlock 15 barriers to trigger the Bonus Game feature. Along the way, Reapers transform into Energy Cells and award special abilities including collecting, transforming and multiplying symbol values (up to 10x). In the Bonus Game feature, you wade through 5 levels which Critters removed with each level you pass. The further you go, the bigger the potential wins.
With a 96.47% RTP rate, Reapers comes with 20,000 x bet max wins and unique gameplay which resembles a video game. If you like what you see, check out the range of Print Studios slots which are superb in my opinion.
- No. of slots 1500
- Payout speed 24 hours
- Win rate Variable
- UK-only Casino With 24/7 Customer Support
- Quick & Free Withdrawals
4. Max Megaways 2 (Big Time Gaming)
- RTP: 96.64%
- Max Win: 147,620x
- Volatility: Very High
- Stakes: 20p to £5
- Release Date: 26 July 2023
Released in July 2023, Max Megaways 2 is by Big Time Gaming and takes you on an intergalactic adventure. Created by Big Time Gaming, it follows on from the spy-themed Max Megaways. With 6 reels and up to 117,649 ways to win, you can play from 20p a spin.
Wins lead to Reactions for consecutive wins. In the base game, there are 4 random extras including extra eilds, 10x Multiplier Wilds, maximum Megaways and symbol transformations. With the Free Spins feature, look out for Power-Ups such as multiplier boosts, double multiplier increases, retriggers, more ways to win and symbol transformations. In the Enhanced version, even more Power-Ups are available.
Offering a very high 96.64% RTP rate, Max Megaways 2 comes with 147,620 x bet max wins. If you want slots with high RTP rates and/or big win potential, check out my best payout slots guide.
- No. of slots 1110
- Payout speed 24 hours
- Win rate 97%
- Free, Instant Withdrawals
- PayPal Available For UK Users
Big Time Gaming created the Megaways mechanic which features in hundreds if not thousands of slot games. Discover the 10 best Megaways slots such as Bonanza Megaways, Rasputin Megaways and Blood Suckers Megaways.
Best Megaways Slots Guide 2025
5. Space Miners (Relax Gaming)
- RTP: 96.47%
- Max Win: 50,000x
- Volatility: High
- Stakes: 10p to £5
- Release Date: 8 February 2022
Released by Relax Gaming in February 2022, Space Miners sees you join mining Martians on 6 reels and 729 ways to win. Playable from 10p per spin, wins award respins which destroy blockers: this allows for more ways to win with up to 1 million available.
Look out for Power Up features which help destroy blocks in horizontal and vertical lines. With the Free Spins features, once a blocker is destroyed, it remains so throughout the feature. You’ll also benefit from 2 new Power Up extras which destroy blocks on both vertical and horizontal lines and in a 3x3 area.
With a 96.47% RTP rate, Space Miners offers 50,000 x bet max win potential. Relax Gaming also developed a jackpot version which comes with 5 Dream Drop jackpots.
- No. of slots 2115
- Payout speed 24 Hours
- Win rate 92.4%
- Biggest Slot Providers
- No-Fee Deposits and Withdrawals
6. Fire My Laser (Hacksaw Gaming)
- RTP: 96.31%
- Max Win: 15,000 x
- Volatility: Medium
- Stakes: 10p to £5
- Release Date: 19 December 2024
Released in December 2024, Fire My Laser is a relatively new space-themed slot game. Played with 7 reels and ReactWins from 10p a spin, the join humanity’s last stand in this intergalactic war against the ruthless Xeno Horde.
This thrilling space adventure is all about Lasers and Bombs which blast symbols off the reels to award explosive wins. There are 2 free spins features (Alien Attack and Extermination) where activated multipliers are collected in a progressive multiplier for bigger payouts.
With a 96.31% RTP rate, Fire My Laser is quirky and comes with 15,000 x bet max wins. As a result, it’s one of the most popular Hacksaw Gaming slots.
- No. of slots 1508
- Payout speed Instant - 24 Hours
- Win rate 97.7%
- 10% Cashback always
- Exclusive All British games
7. Brute Force (Nolimit City)
- RTP: 96.08%
- Max Win: 40,000x
- Volatility: Extreme
- Stakes: 20p to £5
- Release Date: 8 October 2024
Released in October 2024, Brute Force is by Nolimit City and has 5 reels and 21 paylines. Playable from 20p a spin, you form part of a squad of unruly heroes who aim to defend a broken world against an alien invasion.
With an arcade/video game feel, it comes with 8-bit/retro graphics. There are xNudge Wilds that nudge to take over reels with each nudge increasing the win multiplier which can reach 51x. There are 2 free spins features with the Super Brute Spins feature benefitting from sticky xNudge Wilds.
With a 96.08% RTP rate, Brute Force is an extremely volatile slot game with 40,000 x bet max wins. If you want more unique gameplay and mechanics, check out my Nolimit City slots guide.
- No. of slots 2500+
- Payout speed Instant - 24 Hours
- Win rate 96%
- Excellent Payment Options
- iOS & Android Apps
8. Invaders Megaways (Light & Wonder)
- RTP: 96.3%
- Max Win: 75,798x
- Volatility: High
- Stakes: 25p to £5
- Release Date: 15 June 2021
Released by Light & Wonder in June 2021, Invaders Megaways focuses on little green aliens and is a 6 reel game which offers up to 117,649 ways to win. Space themed, it has a 1950s feel and was inspired by the Invaders from the Planet Moolah Las Vegas classic game. The minimum bet is 25p a spin.
With Cascading Reels, UFOs zap symbols on each spin which turns all instances wild. Look out for the Unicow as it increases the number of symbols on all reels for between 168,070 and 1 million Megaways. In the Free Spins feature, 1 of the 5 high-value symbols acts as a wild symbol and comes with a special modifier: they include expanding wilds, double multipliers up to 256x, more symbols/ways to win, 2 wilds and extra wilds.
With a 96.3% RTP rate, Invaders Megaways comes with 75,798 x bet max wins. If you want extending/expanding reels with Megaways, Big Time Gaming’s Rasputin Megaways (up to 2,985,984 ways to win) and White Rabbit Megaways (up to 248,832 ways to win) would be my picks.
- No. of slots 1280
- Payout speed 10 Minutes
- Win rate 96.97%
- 10-Minute Withdrawals + Loyalty Scheme
- Thousands of Excellent Slots
9. Space Donkey (Nolimit City)
- RTP: 96.07%
- Max Win: 14,649x
- Volatility: High
- Stakes: 20p to £5
- Release Date: 3 October 2023
Released in October 2023, you join a species-confused monkey on a quest to annihilate hoards of aliens in Nolimit City’s Space Donkey. With 8-bit graphics, it’s played from 20p a spin on 6 reels and 46,656 ways to win.
There is a Hellfire feature where choppers fire in various directions which adds multipliers to all wilds and paying symbols in the firing direction. In the Hide N’ Seek extra, the monkey moves around collecting chest values. With various symbols to encounter, you continue until the monkey runs out of lives. There is also a Seek N’ Destroy feature the monkey battles aliens using an arsenal of weapons for bet multiplier prizes.
In the Monkeypendence Day feature, random multipliers up to 20x will apply to winnings. Unique and a tad confusing, Space Donkey has a 96.07% RTP rate and 14,649 x bet max wins.
- No. of slots 4000+
- Payout speed Instant - 24 Hours
- Win rate 96.9%
- Great Slots & Exclusive Table Games
- Excellent 24/7 Customer Service
10. Star Clusters Megaclusters (Big Time Gaming)
- RTP: 96.54%
- Max Win: 23,960x
- Volatility: Medium-High
- Stakes: 20p to £5
- Release Date: 26 August 2020
Released in August 2020, Star Clusters Megaclusters is by Big Time Gaming and was the first game to introduce the Megaclusters mechanic. This space-themed adventure takes place on a 4x4 grid and uses Cluster Pays on steroid from 20p a spin.
Each win leads to Reactions which sees winning symbols replaced by 4 smaller symbols for bigger winning clusters. There is a Gold Wild Multiplier which, when part of a win, increases by 1. If you land 5 or more consecutive Reactions, you’ll play the Free Spins feature where Gold Wild Multipliers from the base game and carried over. Free spins take place on an 8x8 grid with 256 symbols!
Offering a 96.54% RTP rate, Star Clusters Megaways comes with 23,960 x bet max wins. Due to it’s appeal, there are more Megaclusters slots from Big Time Gaming and Relax Gaming.
- No. of slots 2500+
- Payout speed 24 Hours
- Win rate Variable
- Huge Casino Game and Slot Selection
- World-Renowned Brand
More Space Slots
Space-themed slot games are fun and offer an immersive experience. As a result, it’s one of the most popular slot themes going. Below, you’ll discover a few options that didn’t quite make my top 10 list above:
- Buzz Thrill: DreamSpin’s debut slot, it’s played on 6 reels and 576 ways to win. Offering Win Both Ways payouts, wins give you respins and reel height increases for up to 46,656 ways to win. There are Mystery Doors that give you wilds or Coins worth up to 500 x bet as well as a Free Spins feature where the number of ways to win only increases. It offers 5,000 x bet max wins.
- Space Invaders: By Inspiring Gaming, it’s the official slot from the iconic arcade game. With 5 reels and 20 paylines, the base game offers plenty of random extras. When you land 3+ Taito Gold Coin Scatters, you spin a wheel to trigger 1 of 6 bonus features including free spins with a 3x3 mega-sized reels, wild reels, sticky wilds and the infamous shoot ‘em up game. Max wins can reach 1,250 x bet.
- Orbitfall: By ELK Studios, this 6x6, Cluster Pays slot sees winning symbols destroy blockers. These may contain feature symbols such as multipliers, redrops and level clears. When you destroy all blockers, you advance to the next level which give you more extras such as the Lazer feature, Alien Attacks and free spins. This game comes with 7,500 x bet max wins.
- Space Wars Megaways XXXtreme: By NetEnt, it has 6 reels and up to 117,649 ways to win. Every win leads to a free re-spin where winning symbols are stacked during the re-spin. For 10 or 75 x your total bet, you are guaranteed at least 10,000 or 50,000 Megaways on each spin (known as the XXXtreme Spins feature). Simple and fast-paced, it offers 14,400 x bet max payouts.
Space Slots with Progressive Jackpots
If you want the chance to enjoy outer space and play progressive jackpot slots, there are a few intergalactic options. All are from Relax Gaming and are part of the Dream Drop jackpot slots series. They are as follows:
| Slot Game | Provider | RTP | Volatility | Max Win (x Bet) | Minimum Bet | Release Date | Jackpot |
|---|---|---|---|---|---|---|---|
| Space Miners Dream Drop | Relax Gaming | 94.00% | Medium | 50000 | £0.20 | 02/04/2024 | £2,509,260.93 |
| Space Attacks Dream Drop | Relax Gaming | 94.00% | Medium | 8000 | £0.20 | 06/08/2024 | £2,509,260.93 |
| Galactic Racers Dream Drop | Relax Gaming | 94.00% | Medium | 10000 | £0.20 | 12/12/2023 | £2,509,260.93 |
Importantly, all Dream Drop games give you the chance to win 5 progressive jackpots. Normally triggered randomly, the biggest is the Mega Jackpot which is guaranteed to pay out at €3 million.
Won every 1.5 months on average, the real-time Mega Jackpot is £2,509,260.93. All Dream Drop jackpot slots, including quite a number of exclusive ones, are available to play at Unibet Casino:
- No. of slots 3750+
- Payout speed Instant Options
- Win rate Variable
- Exclusive Slots & Instant Withdrawals
- iOS & Android Casino Apps
Other Slot Themes
If you’re into your online slot game themes, they are lots to discover. I’ve created guides to the best slot games inspired by animals, ancient Egypt, Greek Mythology, Irish luck, food, the Wild West, Christmas and Halloween:
🦁 Play the Best Animal-Themed Slots Online
𓂀 Uncover hidden treasures with the Best Ancient Egypt Slots
Saddle up with the Best Wild West Slots
🍔 Sizzling Spins: The Best Food Themed Slots
Celebrate Christmas with the Best Christmas Slots
The Best Halloween Slots to Play in the UK
🔱 Play the Best Greek Mythology Slots Online
