Top 25 Slots in UK

Based on the information available to us, here is a list of 25 popular online casino games in the UK in 2021 and their relevant details:

1. Book of Dead – Play’n GO – 10 paylines – High volatility – 96.21% RTP
2. Gonzo’s Quest – NetEnt – 20 paylines – Medium volatility – 96% RTP
3. Starburst – NetEnt – 10 paylines – Low volatility – 96.09% RTP
4. Mega Moolah – Microgaming – 25 paylines – Low volatility – 88.12% RTP
5. Mega Fortune – NetEnt – 25 paylines – Low volatility – 96.4% RTP
6. Mega Joker – NetEnt – 40 paylines – High volatility – 99% RTP
7. Immortal Romance – Microgaming – 243 paylines – Medium volatility – 96.86% RTP
8. Dead or Alive 2 – NetEnt – 9 paylines – High volatility – 96.8% RTP
9. Thunderstruck II – Microgaming – 243 paylines – Medium volatility – 96.65% RTP
10. Vikings Go Berzerk – Yggdrasil – 25 paylines – High volatility – 96.1% RTP
11. Bonanza – Big Time Gaming – 117,649 paylines – High volatility – 96% RTP
12. Rainbow Riches – Barcrest – 20 paylines – Low volatility – 95% RTP
13. Jack and the Beanstalk – NetEnt – 20 paylines – Medium volatility – 96.3% RTP
14. Twin Spin – NetEnt – 243 paylines – Low volatility – 96.6% RTP
15. Great Rhino – Pragmatic Play – 20 paylines – High volatility – 96.53% RTP
16. Reactoonz – Play’n GO – 7×7 grid – High volatility – 96.51% RTP
17. Sizzling Hot Deluxe – Novomatic – 5 paylines – Low volatility – 96.66% RTP
18. Wolf Gold – Pragmatic Play – 25 paylines – High volatility – 96.01% RTP
19. Raging Rhino – WMS – 4,096 paylines – High volatility – 96.18% RTP
20. Fruit Shop – NetEnt – 15 paylines – Low volatility – 96% RTP
21. Reactoonz 2 – Play’n GO – 7×7 grid – High volatility – 96.48% RTP
22. Deadwood – Nolimit City – 3,888 paylines – High volatility – 96.06% RTP
23. Divine Fortune – NetEnt – 20 paylines – Medium volatility – 96.59% RTP
24. Who Wants to Be a Millionaire – Big Time Gaming – 117,649 paylines – High volatility – 96.24% RTP
25. Medusa Megaways – Blueprint Gaming – 117,649 paylines – High volatility – 96.28% RTP

It is important to note that this list is not exhaustive and there are many other popular online casino games available in the UK, and it is also important to check the casino’s licensing, regulation and reputation before playing any game. Additionally, it is important to note that RTP (Return To Player) might vary depending on the casino and the game version, always check the game details before starting to play.