Agar.io was released as a browser-based game where players control a cell and consume others to grow larger, marking the game's public debut.
The official mobile version of Agar.io was released on iOS and Android platforms, making the game accessible on smartphones and tablets.
Agar.io saw a massive surge in popularity, particularly on streaming platforms like Twitch, where many gamers broadcast and watched Agar.io gameplay.
Agar.io added a party mode feature that allowed friends to play together in private matches, improving multiplayer interaction.