Cryptex

Cryptex is a 3D twisty puzzle in the spirit of a Rubik's cube, but instead of a cube you get an elongated prism of gems. Pick your size: 3 to 8 faces and 3 to 20 sections. Slide a face along the axis or twist a ring, and the gems flow onto neighbouring faces. The goal is simple: make every face a single colour. No timers, no fail state — solve at your own pace and beat your personal best for each size. Every scramble is always solvable.