Command and Conquer: Red Alert is a open-source 1996 real-time strategy game released under the GPLv3 licence, and its codebase has recently been successfully ported to the Raspberry Pi Pico microcontroller.
Blogger Charlie Birks wrote a series of posts on Mastodon documenting the process and incremental improvements over several days, with the game eventually able to run missions and utilise multiplayer functions between two Picos.
The Raspberry Pi Pico 2 was not quite sufficient to run the game, so Birks used the upgraded Pimoroni Pico Plus 2 W, and an SD card was also required to save memory.
All of the code changes have been published in a fork of Red Alert on GitHub for other developers to use.
