Another Visitor: Truly one of the best games ever. Human factors so far ahead of it's time. Multi-level puzzle, a proper treat to figure out!
Nutti: One of the best C64 games definately and for it's time back in 1984 just unbelievable. Difficulty level is just right. It takes about two hours but you need to practise first. Played it through when I was 10yo with a little help from English dictionary :) Considered that as major achievement and sure it was. The puzzle was stressful as there was a time limit and had no experience of such things.
markegiani: I was a kiddo when this was a hit, so I didn't understand it much. Nevertheless, it was an awesome game. Graphics were fantastic for the time.