OoO Ring is a three-band puzzle ring that should not be too difficult to solve. It is topologically different from regular puzzle rings. Can you see how?
This is the plastic version. Buy the silver, brass or bronze version
here.
Watch the
YouTube video of the successful prototype
Watch the
YouTube video of an earlier failed first prototype.
Please order a 3D-printed puzzle ring from Shapeways at this page, or
contact Oskar directly if you have any special requests about ring size or material.