Hello again.
Yesterday I've tried to run GB on my expanded A1200, and... game doesn't work at all!
Trying running from WB is like clicking anywhere on screen - no effect at all. Booting from floppy game loads to some point and stops with black screen.
I was trying without cache and on original settings in Early Startup Menu, of course - result is same. I suppose game is not requiring KS1.3?