Aquatic-themed puzzle game "Fishdom" starts off our list with 1.51 billion hours played from May through July of 2018.
"PlayerUnknown's Battlegrounds Mobile" is the free-to-play smartphone version of the popular battle royale game, and takes ninth place with 1.52 billion hours played.
"Slither.io" is the perfect simple, low-pressure game for players who enjoy the cult classic "Snake" and just want to kill a few minutes on a bus ride or while waiting in line. "Slither.io" users played for 1.54 billion hours.
"Helix Jump" is an equally addicting game, but requires a lot of focus. This hopping game, which was played for 1.74 billion hours, is better suited for extended commutes or dedicated play time.
"Subway Surfers" is a fast-paced running game about adorable urban vandals. Mobile gamers played this one for 2.43 billion hours over the period in question.
Role-playing game "Lords Mobile" lets you conquer your enemies in a fantasy setting — either alongside friends, or on your own. "Lords Mobile" was played for 2.93 billion hours.
"Fortnite: Battle Royale" makes the list at number four, with 2.98 billion hours spent in the app. That number doesn't tell the whole story, though: During the three-month period in question, it wasn't available for Android, at all. That means that it was fourth place overall with only iPhone players.
One of the largest contributing factors to Fortnite taking forth place is that the game isn't available on the Google Play Store, making it significantly less accessible for Android users.
In a dataset only looking at games downloaded from the Apple App Store, Fortnite is at the very top of the list.
Tim Sweeney, the founder and CEO of Fortnite creator Epic Games told Business Insider that they decided not to host the game on the Google Play Store in order to avoid paying a portion of their profits to Google.
