OOTP 21 introduced several significant upgrades to the franchise:
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: A new guided experience to help both newcomers and veterans navigate the deep management systems. OOTP 21 introduced several significant upgrades to the
: Implementation of then-new 2020 MLB rules, such as 26-man rosters and the three-batter minimum for relief pitchers.
: The game remains listed on the Steam Community for those who already own it in their library. As of April 2026, the game is no
As of April 2026, the game is no longer the current version in the series (OOTP 27 is the latest). Official installers for older versions are primarily provided for customers who have already purchased a license.
: Allowed users to create or modify custom stadiums. : Fully licensed by MLB and the MLBPA,
: Fully licensed by MLB and the MLBPA, featuring authentic rosters, logos, and leagues.