US Patent 10188937 Puzzle book

A linked sequence of mechanically encoded puzzle pages is disclosed. Each page is comprised of multiple planar layers interconnected to implement the puzzle design of the page. The puzzle of each page must be solved to disengage a latching mechanism enabling the player to turn the page and begin solving the puzzle in the next page. Similarly for the next page, and each succeeding page until the last page, solution to the puzzle by the player will disengage a latching mechanism. The latching mechanism holds the active page being solved by the player to the next page. In the implementation of the invention described in this disclosure the latching mechanism comprises a hooking piece protruding in a perpendicular direction from the planar front surface of the next page, where the hooking piece fits into an opening on the planar back surface of the active page and a blocking piece on the active page is aligned between the hook portion and the exit to the opening, thereby preventing the hooking piece on the next page from disengaging from the active page.