Probably Hardball. I found a bittorrent with all the Commodore emulators and every game ever made. It was a lot of fun taking the trip(s) down memory lane. Still highly playable is Elite and MULE. I like Sword of Fargoal too, but damn that is a hard game to solve.
When I first got my Commodore, I had to type in all of my games manually (from Compute Gazette magazine) line by line, either in BASIC or machine language. When I was done and turned the computer off, POOF - games were gone. After dinner, had to type them in again, line by line. Eventually I upgraded to a datasette, and the wonderful world of load errors... Interestingly my career ended up in computer data storage.