Thanks for the hi-score fix. I just played concept 1.01 and still the sprites go into the tunnel. He entered the tunnel on the right side of the screen.
Ok must be some other code interfering somewhere, I'll have a look at some point.
Somehow the changes I made yesterday aren't there, must have had a different working folder open :-$ Replacement .d64 file up.
I've noticed that when sprites run away, they can go through walls