Io games, also known as agar.io and slither.io, are gameplay-based browser games. They typically involve a single user controlling a blob-like character, usually with the goal of increasing the size of their character by consuming smaller characters or objects in the game-world. Additionally, some of these games involve a wide variety of opponents or adversaries that must be outmaneuvered. Io games are played in real-time and can require lightning-fast reflexes to be successful.