It is subjective to determine the most popular online slot games worldwide as it can vary depending on individual preferences and regional differences. However, here are 10 popular online slot games that have gained significant popularity this year:
1. Gonzo’s Quest by NetEnt
2. Starburst by NetEnt
3. Book of Dead by Play’n GO
4. Mega Moolah by Microgaming
5. Bonanza by Big Time Gaming
6. Wolf Gold by Pragmatic Play
7. Immortal Romance by Microgaming
8. Dead or Alive II by NetEnt
9. Jammin’ Jars by Push Gaming
10. Divine Fortune by NetEnt
Please note that popularity can be subjective, and the rankings might vary depending on different sources and player preferences.