maze

n.

A graphic puzzle, the solution of which is an uninterrupted path through an intricate pattern of line segments from a starting point to a goal.

sudoku

n.

A logic-based placement puzzle in which numbers must be fit into a 9x9 grid such that each numeral appears exactly once in each row, column and each of nine 3x3 blocks.

The name "Sudoku" is from Japanese 数独, meaning "the digits must occur only once".

Sudoku was invented by an American but popularized by the Japanese.

Also known as Number Place.

tangram

n.

A Chinese puzzle consisting of a square cut into five triangles, a square, and a rhomboid, to be reassembled into different figures.

Rubik's Cube

n.

Rubik's Cube or informally Rubix Cube is a mechanical puzzle invented in 1974 by the Hungarian sculptor and professor of architecture Ernő Rubik.

Originally called the Magic Cube by its inventor, it was renamed Rubik's Cube in 1980 and released worldwide in May of that year. It is said to be the world's best-selling toy.