The Call of Duty open beta is a free trial period for the game that allows players to test out the game before its official release. The open beta for Call of Duty: Modern Warfare III was available to all PlayStation 4 and 5 owners during Weekend Two, regardless of preorder status. Xbox and PC players had early access to the beta if they preordered the game, and the beta became available to all players on October 14, 2023. The beta included several maps and game modes, such as Favela, Skidrow, Estate, and Rust, and the Ground War mode was featured in the beta, too, with players able to test out the Popov Power map.