Thanks. I do not replay them... Because on some I don't remember how I win!
And yes, I'm playing it in Vice only because it is simpler than connecting my real C64 :)
Anyway, it shows you can go to set 5, even it I'm missing 2 levels on set 4 :(
How did you onlock the levels on the real C64 then? Did you make a copy of your .d64 file?
I save my game every time I finish a level, just to be sure to keep my progress.
After that, I copied the d64 file I'm using with Vice on my SD2IEC extension to run it on my real C64.