This is a design I made of Oskar van Deventer's cubic maze puzzle, called "Oskar's Cube." This puzzle is a bit obscure, and I wasn't able to find a place to purchase it. As such, I decided to create a fully printable one.

The puzzle is simple: Have the rods aligned such that each rod is either aligned through a circle or square. Then manipulate the rod through the maze so it ends where the rods all through the other indicated positions. (E.g. if the rods start through the circle positions as shown in the picture, navigate them through the maze to get all rods through the squares.) Be warned, this puzzle is deceptively difficult! There are lots of steps and backtracking. If you want a solution, there's a PDF in the downloads section.

Printing is straightforward, but make sure you assemble the pieces in the correct orientation! I've provided photos for reference in the downloads section.