Archon
Archon II: Adept
Bard’s Tale I, II, III
Several of the Ultima games
Might & Magic I, II
Pool of Radiance
Curse of the Azure Bonds
Seven Cities of Gold
Fahrenheit 451 (with the mechanical dogs with needle tounges, great stuff!)
I can’t remember! Seems like there was a decent chess game I played a lot, but I may be thinking of the Sargon for VIC-20. There was also Omega Race (shoot-em-up) for the VIC that we wore out. We had the VIC maybe a year before moving up to the 64, and I typed in a whole bunch of those Compute, Run, and Compute Gazette programs, mostly games, but y’all have yet to name any I can remember playing.
Top Favourites
Defender of the Crown (favourite solo game!)
Pirates! (second favourite solo game!)
M.U.L.E (favourite team game)
Other games I really liked
Bard’s Tale
Archon (I’d forgotten about that one until I read jayjay’s post)
I tried a lot of games, but those were the ones I kept coming back to - particularly the first 3.
I tried Zork but was never much good at it. Ditto Hitchhikers Guide to the Galaxy. I got much better at those kinds of games later in life, but I just didn’t have the right mindset for them at that time.
I got so frustrated trying to map out Zork…
Flight Simulator
Telengard
Pool of Radiance
Might & Magic
Zork - well, most of the Infocom word adventure games - I loved them.
I also had a chess game, but I can’t remember the name.
Lode Runner!
Castle Wolfenstein
Zork.
Ultima: I, II, III
Larry Bird & Dr. J go One on One.
ES Sports Archon II, Adept.
Paradroid. Love this game.
Any of the construction set games.
I still have my C64 disks. I wonder if they’ve degraded beyond readability, or if they’re still usable.
Earth Orbit Stations could stand to be updated to modern concepts. I always felt that the game was too limited by the then-current concept of space flight.
PHM Pegasus was fun. I never did win the Persian Gulf mission, though.
The all-text Infocom games are classics. Many of them are very replayable. Who here still knows how to retrieve the Babel fish? (raises hand)
The Hobbit.
And I never finished the bugger, allus got stung to death within sight of Hobbitown.
What’s more I don’t think they have it on disk for PCs
Hang robe on hook
Put towel over drain
Put satchel in front of panel
Put mail on satchel
Press Button
Y’all are commadore snobs-- I had the Vic-20, and my 10-year-old self loved it!
My games:
Blue Meanies From Outer Space
Tooth Invaders
Jupiter Lander
Blackjack
Super Slither
That’s all I can remember.
Sounds like Karateka, which is what I came in to mention.
It was actually Yie Ar Kung-Fu: Yie Ar Kung-Fu - Wikipedia
Dude, are you me? I was going to list 5/6 of these.
How about Karateka?
(Rats! Someone beat me to Karateka! I’ll add the Phantasie series. )
Hee. What games didn’t I play on the 64? I have over 200 5¼ disks–formatted on both sides–sitting around, most of which are unsuable partly because I was a dumb kid who felt sleeves just got in the way.
Super Mario Brothers (yes, on the C64)
Maniac Mansion
Summer Olympics
We got our system from some dude, probably at a time when the C64 was at the end of it’s popularity (to replace the Atari, which we got from some other dude at a time when IT was at the end of it’s popularity (we were poor)). We only had games that had been written to floppies - no store-bought games. Most of the ones we had didn’t work, except the ones above. In fact I never knew you could actually buy games - I thought you had to copy them from people 
Eventually, in the 90’s, we got a Nintendo (…at the end of its popularity). I spent so much time playing these old scrolling games with a joystick that I had a horrible time attempting to play anything that was 64-bit and had more than one direction. To this day I can’t play 3D games!
Zork
Zork II
Leather Goddesses of Phobos (with 3d comic and glasses.)
Rendezvous with Rama - never got very far
plus a disappointing version of the Star Wars arcade game. The controls were upside down to me (you pulled the joystick down to move up) so I never did as well on it as I did on the arcade machines.
Pirates!, Fireworks Construction Kit, and Choplifter, which have been mentioned; but I can’t believe I get to be the first to mention Impossible Mission.