The Last Ninja gives me probably my greatest memories on the C64. There were alot of other games that were great for that machine as we all know, but that one had me stumped for so long, and then when i finally figured the whole game out, i probably played it over and over about 100 times or more. lol.
The Music in it too was amazing for that small amount of memory. System 3 really got it right by producing some top tunes inbetween each level when it loaded from tape. the dungeon level music with all the skeletons running towards you almost had me shitting myself.