SimCity Classic
The Matrix has 86 simulation games on file for the Commodore 64, released between 1981–1990. 8 of them support multiplayer. They're ranked below by legacy score, so the games that shaped the genre on the C64 come first, with lesser-known picks further down.
Simulation games model a system and let you play inside it, whether that means building a city, flying a plane, raising a pet or running a business.
Typical commitment: weekend project (roughly 6–20 hours). Tip: Simulations are often open-ended. Set yourself small goals and enjoy experimenting with the systems.