TRS-80 Color Computer, 1982
The underappreciated galactic conquest classic: a "4x" game before the term for the genre was invented, and the primary reason I'm into programming today. Ported lovingly line-by-line from the TRS-80 Color Computer code, now with online multiplayer for up to four admirals. Send out your starships, and mind the ghost fleets!
Adapted and presented here with the approval of the original authors: Graham Wilson, original author, TRS-80, Model I; Ted & Drew Shorter: CoCo port (with computer players added by Drew)