If anyone wants to spend some time working this entry up, you'll probably want to use HG101 as a starting point and then work from there. The European and US C64 versions should probably have different screenshot galleries to keep things organized a bit better, and I've got zero experience with the other versions.

Some of those (especially the DOS and ZX Spectrum) versions look comically bad and worth checking out for laughs alone.

I wonder if any of them incorporate any new stages or if the changes are primarily graphical.