As the mobile gaming industry continues to grow, it can be difficult to determine the exact ranking of the number one Android game worldwide as it frequently changes depending on various factors, such as user downloads and ratings. However, currently, some of the most popular games on Android include titles such as PUBG Mobile, Call of Duty: Mobile, Garena Free Fire and Mobile Legends: Bang Bang. Ultimately, the top-ranked game is subject to constant change and is dependent on various contributing factors.