Matchstick puzzle
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. Other matchstick puzzles require lateral thinking and are not just about making geometric shapes. Different three-dimensional matchstick arrangements are also possible as puzzles held together with friction.