Puzzles

Sudoku (; ; originally called Number Place) is a logic-based, combinatorial number-placement puzzle. In classic Sudoku, the objective is to fill a 9 × 9 grid with digits so that each column, each row, and each of the nine 3 × 3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which, for a well-posed puzzle, has a single solution.

thumb|An American-style 15×15 crossword grid layout

thumb|upright=1.2|Various physical puzzles

mathematical problem

knot in Greek mythology, used as a metaphor for difficult problems with little or no solution

thumb|upright=1.35|A hedge maze at [[Longleat stately home in England]]

puzzle presented as a set of mechanically interlinked pieces

site of problems to be solved using programming knowledge

subgenre of detective fiction in which a seemingly impossible crime is committed

thumb|In The Adventure of the Abbey Grange (1904), [[Sherlock Holmes investigates the murder of Eustace Brackenstall]] A whodunit (less commonly spelled as whodunnit; a colloquial elision of "Who [has] done it?") is a complex plot-driven variety of detective fiction in which the puzzle regarding who committed the crime is the main focus. The reader or viewer is provided with the clues to the case, from which the identity of the perpetrator may be deduced before the story provides the revelation itself at its climax. The investigation is usually conducted by an eccentric, amateur, or semi-profe

mathematical problem

right|thumb|Ostomachion (after Suter) thumb|Ostomachion (after Suter): square reformed with some pieces turned over thumb|alt=Ostomachion Figures| Ostomachion figures mentioned by Ausonius and others (Bibliotheca Augustana)

oral guessing game for companies

type of puzzle

puzzle involving connecting numbered dots

thumb|A rattleback in action A rattleback is a semi-ellipsoidal top which will rotate on its axis in a preferred direction. If spun in the opposite direction, it becomes unstable, "rattles" to a stop and reverses its spin to the preferred direction.

also knows as twisty puzzles, turning puzzles and Rubik's puzzles

simple mathematical game

thumb|A logogriph published in Bower of Taste (February 9, 1828)

Perplexus, originally released as Superplexus, is a 3-D ball-in-a-maze puzzle or labyrinth game enclosed in a transparent plastic sphere. By twisting and turning it, players try to maneuver a small steel ball through a complex maze along narrow plastic tracks. The maze has many steps (varying across puzzles). The number of steps ranges from 30 in the Perplexus Twist to 225 in the Perplexus 3x3 Rubik's cube Hybrid. Some levels drop the ball into a cup or a small rim to utilize its 3-D nature. Players must complete obstacles varying in difficulty to reach the end.

dexterity puzzle involving a ball in a maze

American non-profit organization devoted to the hobby of cryptography

puzzles requiring thought including riddles

rearrangement puzzles in which a number of matchsticks are arranged in various shapes