Thanks to contributor Ken Knight, it has been highlighted that the preview of puzzler Cubic, called Cubic Maxi contains some differences in the game play compared to the final release. Otherwise it looks pretty much the same as the final game, but worth checking out:
Download Preview_cubicmaxi
After asking what Cubic Maxi is Marcel added, “it’s me who made cubic for c64. someone maybe make more levels and he named it as cubic maxi?”
The credits all say Marcel, was there a level editor?
Thanks Ken! I suspect that someone loved the game so much that they disassembled how the levels were stored and created their own. They may have even created their own bespoke editor to do it. Haven’t seen a public version of the editor anywhere though.