.io games

Agar.io is a massively multiplayer online game created by Brazilian developer Matheus Valadares and published by Miniclip. Players control one or more circular cells in a map representing a Petri dish. The goal is to gain as much mass as possible by eating cells and player cells smaller than the player's cell while avoiding larger ones which can eat the player's cells. Each player starts with one cell, but players can split a cell into two once it reaches a sufficient mass, allowing them to control multiple cells. The name comes from the substance agar, used to culture bacteria.

Slither.io (stylized as slither.io) is a multiplayer online video game available for iOS, Android, and web browsers, developed by Steve Howse. Players control an avatar resembling a snake, which consumes multi-colored pellets, both from other players and ones that naturally spawn on the map in the game, to grow in size. The objective of the game is to grow the longest snake in the server. Slither.io is similar in concept to the popular 2015 web game Agar.io and is reminiscent of the classic arcade game Snake.

Diep.io (stylized as diep.io) is a multiplayer browser game created by Brazilian developer Matheus Valadares (also known as M28) in 2016. Miniclip first published the mobile version. In Diep.io, players control tanks in a two-dimensional arena. They earn experience points and upgrades by destroying shapes and other tanks.

Surviv.io was a browser-based multiplayer online 2D battle royale game created by Justin Kim and Nick Clark. It was released in October 2017 on its website for desktop browsers, and in October and November 2018 respectively for iOS and Android devices. Similar to other titles in the battle royale genre, players battled against other players on a large map from a top-down perspective, scavenging for supplies and weapons. The game also supported two or four player team modes, and could be played on mobile browsers as well.

ZombsRoyale.io is a battle royale game developed by End Game Interactive. It was released for web browsers in 2018, with iOS and Android ports later that year. A simplified take on the genre, game matches follow up to 100 players who must fight on a large map to be the last survivors. It uses simple 2D graphics and a top-down perspective. The game has amassed over 120,000,000 downloads and unique players across iOS, Android, Web Browser, and PC as of 2024.

Hole.io is a 2018 physics puzzle game with battle royale mechanics created by French studio Voodoo for Android and iOS.