Was the level 50 patch was applied to this game? When the original was released, the last level was considered to be so ridiculously difficult that Bullfrog actually issued a patch to make it less difficult. (Believe it or not, I *STILL* have that patch file!)

I would send a copy of that file to GOG support, in case it wasn't. Maybe they can somehow incorporate it.

It wasn't a case of level 50 being too difficult, it was something about the level being impossible to complete.
Apart from that, the patch in question is already included in the GoG version - so there's nothing at all to worry about.

I actually found some issues running level 50. Kept crashing and sometimes hanging when there were too many objects on the screen at once (funny that level 49 had no issue). I solved this by lowering the graphics (sky, reflections, soften, etc.) and lowering the cycles to keep the game at the same speed. This solved the issue.