well, if you wanna know, I also experienced that in Yo! Joe too... still it's a nice game.
at least you finished Chaos Engine, I still try today with no sucess..
Well, I also finished Silkworm , it seems like everyone finished that one
I also finished every beat'em up I played on amiga, except Elfmania (I always foundthis game damn hard)
I also would like to say I have finished Alien Breed 2.. I always played this one with a friend (NEVER using passwords), and we were getting REALLY good at it.. one day we finally reached the military building, the game asks for disk 3, I insert it, and the game refuses to load it..
that was a very sad day for me and my friend