Originally developed for baseball, it has since been expanded to each of the other major American professional sports, as well as soccer.
Each of the grid's three rows and columns corresponds to a professional team, statistical achievement, or award, and players must fill each square by selecting an athlete who meets both criteria.
Originally, the grids were automated, but Minter eventually began to select the categories himself in order to avoid repetition.
As of May 2023, the game was primarily played by Minter and his friends, but it began to gain a larger audience when one of them posted it to Reddit, and became even more popular after it was shared by the Twitter account @FoolishBB on June 13.
[2] Sports Reference LLC purchased the game on July 11; the company integrated links to lists of all valid choices for each square on its site Baseball-Reference.com, added more player photos, and announced plans to create separate versions of the game for basketball and American football.