Support for macOS Mojave will end on Steam, and support for 32-bit games for macOS will also end.

Valve, which operates the game sales platform Steam, announced that Steam will end support for macOS High Sierra (version 10.13) and macOS Mojave (version 10.14) on February 15, 2024. As a result, titles that are only compatible with the 32-bit version will no longer be playable on macOS.

Steam Support :: Steam macOS 10.13 and 10.14 Support
https://help.steampowered.com/en/faqs/view/743F-2E0E-C9A5-C375

Steam dropping support for older macOS versions, and that's bad news for 32-bit games - 9to5Mac
https://9to5mac.com/2023/11/30/steam-dropping-support-for-older-macos-versions/

Valve says, ``Starting February 15, 2024, Steam clients installed on macOS High Sierra and macOS Mojave will no longer be able to apply updates of any kind, including security updates. We cannot guarantee continued functionality across versions.'

macOS Mojave is an OS released in 2018 and is the last version of macOS that can run 32-bit games. Apple has announced that 32-bit applications will no longer work on macOS Catalina released in 2019.

Following iOS, macOS will end support for 32-bit versions, and ``High Sierra 10.13.4'' and later will display notifications when launching 32-bit apps - GIGAZINE

Valve said, ``Apple chose to discontinue support for 32-bit applications with the 2019 release of macOS Catalina, and many developers of 32-bit games have not updated to support 64-bit executables. , some games will effectively stop working on macOS. At the end of 2023, Steam will no longer mark games that only support 32-bit binaries of macOS as 'macOS compatible.'

According to Valve, more than 98% of users of the Mac version of Steam are already running macOS Catalina or later, so the impact of ending support for 32-bit games for macOS is expected to be quite small. In the case of Windows versions, games that only support 32 bits can be played on 64 bit versions of Windows.

Also, just because Steam ``no longer supports'' macOS High Sierra and macOS Mojave does not mean that Steam will suddenly stop working on the same OS. Valve says, ``Even though support for macOS High Sierra and macOS Mojave ends in February 2024, Steam clients and games on these older OSes will continue to work for some time.''