"Run io games" is a broad term that refers to the category of online multiplayer games where players control a character that runs through an obstacle course or tries to avoid various forms of obstacles in order to reach a goal or achieve a high score.
Some popular examples of run io games include games like Sprinter, Run 3, and Tomb Runner. These games are often free to play and can be found on many gaming websites.
If you're looking to play run io games, you can try searching for them on popular gaming sites such as Miniclip, Kongregate, or Poki. They usually have a wide selection of these types of games available to play for free.