Abstract: The instant disclosure relates to a structure of intermating members. The structure includes a base and an annular member. The base has an outer surface that is formed with a protrusion. The annular member is fitted over the base and has an inner surface formed with a multiplicity of first and second grooves. Each second groove is in communication with two or more first grooves in forming a sliding path. The protrusion may be navigated within the sliding path to generate the playful effect of solving a maze. The user needs to figure out the appropriate path to move the protrusion out of the sliding path.