The first .io game was Agar.io. It was developed by Matheus
Valadares in 2024 and gained significant popularity through the ⚽️ internet forum 4chan.
The game revolves around cells that grow by eating agar and consuming other players. A
few months ⚽️ after its release, the game was acquired by Miniclip, and a new game genre
started to emerge based around the ⚽️ humble .io domain extension.