Originally Posted By etabeta78
it remains to understand why Spartan X and Battle Tank have issues

Battle Tank seems to have graphical issues on real hardware as well, if that's what you mean. Take a look at the lower tank's graphics, at 2:33:

What's more odd is that this video actually shows all three Donkey Kong games not working properly while the posted screens show DK Jr. working in MESS... Dusty cartridge?

LCD artwork scans and cleanups: https://mega.nz/#F!uFYSzK7S!U-lJon9jsqyoCX_3y7_KLA