STL Files (including Fusion 360 model and detailed print + assembly instructions) are available for the Art Deco Puzzle Box ...

So you like a challenge, but a run-of-the-mill 9 x 9 x 9 Rubik's Cube just doesn't melt your brain anymore... How about tackling a colossal 33 x 33 x 33 twisty cube, like this 3D-printed creation from ...