How to play 32-bit Steam games on macOS 12.6 (Monterey)?

Apparently since macOS Catalina 10.15 Mac disabled support for 32-bit apps? How can Steam games like Portal 2 be played on MacBooks that have been keeping up with macOS updates? In my case I'd like to do this on Intel MacBooks from 2015.

How to play 32-bit Steam games on macOS 12.6 (Monterey)?

Apparently since macOS Catalina 10.15 Mac disabled support for 32-bit apps?

How can Steam games like Portal 2 be played on MacBooks that have been keeping up with macOS updates?

In my case I'd like to do this on Intel MacBooks from 2015.