2015–2020: Surge in popularity, Agar.io and Slither.io Agar.io was announced on
4chan on 27 April, 2015 by Matheus Valadares, Most were simple
clones of popular games, released in a top down-format.
ZombsRoyale.io,
Surviv.io,
Shellshock.io, Hole.io,
Snake.io, and Krunker.io.
2021–2024: Popularity decline .io games became popular during the peak of the
COVID-19 pandemic; from 2020 to 2021, because of their easy accessibility on the web. After 2021, the popularity of .io games had generally declined due to the lack of updates and the rise of traditional mobile and video gaming. == References ==