After seeing Bermuda Comet and Bermuda Jumblix, both "core-mods" of Bermuda Minx, I started thinking whether there would be a fourth geometry that can use Bermuda Minx pieces. Then I remembered Rhomdo, and surprise-surprise, also that geometry can be built from these pieces.
I find it quite surprising that pieces of a puzzle can be reused for another puzzle with a completely different geometry. I find it even more surprising that the pieces can be used for four different geometries in total. Or would there be a fifth geometry as well? Do we know any other twisty puzzles that can be "core-modded" into each other?