Amiga

I loved the C64 (and my eventually '030 expanded Amiga B2000).

I played the hell out of Lode Runner (and on Amiga) and Archon / Archon II.

The others on this list didn't grab me as much.

Other C64 titles I remember I played a lot were:

• The Bard's Tale set.. I have a sneaky suspicion I have some of the maps lying around in storage somewhere.
• Zork series (I recall getting a guide via a BBS back in the day)
• Paradroid (and Paradroid 90 on the Amiga)
• International Karate +
• The Boulderdash series (and constructor kit... sharing levels back and forth with friends)
• Commando (another title with Rob Hubbard's musical magic tricks with SID)
• The Pitfall games
• Elite (and now Elite Dangerous on PC)
• Arkanoid / Arkanoid II
• Green Beret
• Wizardry games (I didn't play the Ultima games until the Amiga)
• Spy hunter (having played this well before seeing Blue's Brothers, I thought it freaky they were using game music - ah naive young me)
• Pole Position (I think there was a sequel but I don't recall if that was the C64 or Amiga)
• Ghost'n'Goblins
• The Monty on the Run games
• Nebulus (with some clever overlapping of colour and mono sprites for better resolution)
• The Sentinel (and my book of oh so many level codes - I have never found a satisfyingly playable PC port but the Amiga had a good one)

Some I really missed finding good ports on the Amiga (but then I had a ton of other choices on the Amiga too)