Try to open the puzzle by removing the 4 cylinders with the numbers. (2014 is year of design). Inlaid numbers. Materal acrylic.If you have problems to open it, use the green tool.But try to find out why this tool is in the BOX!!!GOOD LUCK!
I started designing puzzles in 1982. That was roughly the same puzzle, but without the 2 cylinder obstacles. The task of this puzzle: remove the ring in the center. I sold 40 of them. 3 collectors sent me the solution. Warning: it is a tricky puzzle!!