It must be the pasti as I've just tried Au121 and it works ok on level 7.
Looks like it struggles to read the data correctly from track 66 to 69.  It repeats this sequence and then wipes the memory then hangs.

PASTI: Read track. track: 40, side: 0           Disk check
PASTI: Read track. track: 66, side: 0
PASTI: Read track. track: 67, side: 0
PASTI: Read track. track: 68, side: 0
PASTI: Read track. track: 69, side: 0
PASTI: Read track. track: 66, side: 0
PASTI: Read track. track: 67, side: 0
PASTI: Read track. track: 68, side: 0
PASTI: Read track. track: 69, side: 0

I've tried it with max accuracy on pasti too.

Does anyone have another pasti of this game I can try???  :'(