A maze is a complex tour puzzle in the form of a complex branching passage through which the solver must fin a route. This is different from a labyrinth, which has an actual through-route and is not designed to be difficult to navigate (despite the common uses of the word to indicate various complex, confusing structures). The pathways and walls in a maze or labyrinth are fixed (pre-determined). Maze-type puzzles where the given walls and paths may change during the game are covered under the main puzzle category of tour puzzles.