I haven't seen exactly that here in the US, but I've got some puzzles that aren't just knobs on 4 sides. Quite a few of the pieces are slanted, have 3 sides, s

I haven't seen exactly that here in the US, but I've got some puzzles that aren't just knobs on 4 sides. Quite a few of the pieces are slanted, have 3 sides, sit at an angle, etc. It adds quite a lot of variation without breaking the interlocking nature of the puzzles we are used to. Edit: I just realized that for kids, those knobs are easy to break off. The puzzle you showed makes more sense for kids.