Mechanical puzzles are hand-held objects presented as a set of physically interlinked pieces. Solving them involves achieving a specific goal by manipulation of the parts. There are several categories of mechanical puzzles, including assembly and packing puzzles, dissassembly and take-apart puzzles, interlocking puzzles, puzzle locks and trick locks, maze and sequential movement puzzles, and sequential discovery puzzles. Each of these styles of mechanical puzzle presents a different challenge and requires a different method of solving. You can read more about the different types of mechanical puzzles here.