One Million Checkboxes is a free web game that was developed by Nolen Royalty, an American software engineer, in 2024. A web page on the game's website contains one million checkboxes that participants can either select or deselect. Players interact with one another by marking and unchecking checkboxes, as they all observe the same state. The game rapidly gained popularity and attracted thousands of participants, resulting in a variety of behaviors, including the ability to check as many boxes as possible or the attempt to uncheck boxes that had already been checked.
