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Bilz Box . . . bi-level clear polystyrene maze A steel ball - once discreetly placed at a certain point within the maze . . . and an applied pressure on a certain point outside of the box - will aid in releasing the slide drawer at the end of the box that may have a dollar bill within it .
Free The Key Aluminum key with brass ring . Made by Puzzle Makers International . Currently also sold on Bits & Pieces .
Keychain Keys Once you find the right combination of 'workable' surface notches, the keys will then separate .
The orange Dool-'o'-rinth . . . . . 'simple'
There are six colors of progressive difficulty levels : easy yellow . . . . . simple orange . . . . . silly green . . . . . complex blue . . . . . crazy red . . . . . terrible black .
To quote a fellow collector friend of mine : "..... maybe they rate by # of dead-ends? Distinct passages? Total solutions (fewer = harder)? Length of solution passage, or number of turns or