Matchstick puzzles are rearrangement puzzles in which a number of matchsticks are arranged as squares, rectangles or triangles. The problem to solve is usually formulated as: "move n matchsticks to make m squares, triangles, or rectangles". Some match stick problems are solved with planar topological graphs. [1][ dubious – discuss]
Other matchstick puzzles require lateral thinking and are not just about making geometric shapes.
Different three-dimensional matchstick arrangements are also possible [2] as puzzles held together with friction. However, none of these are produced yet.
Different number puzzles (see the top) can also be implemented. They are usually implemented using seven-segment displays. Also, they would be an ideal puzzle if the number of matchsticks to move is 1, 2 or 3.