Very Challenging~

           3 otters Brain teasers and puzzles are very challenging~  Each set comes with a 3D wooden ball puzzle, cube puzzle and 8 metal wires puzzles.   The two wooden puzzles do take some times to figure out how to disamble them.  I would say it's a bit tricky too~ Brain teasers for sure~ The 8 sets of bent metal wires entangled together are fun to play~ takes few tries or more to take them apart.  We find this set to be very challenging and fun~ They do require some thinkings.  We like it very much~