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Letter A is a Rubik's cube.

A Rubik's cube is a 3D jigsaw puzzle. It consists of a plastic cube with six colour. To solve it you need to place one colour in each face of the cube.

Letter B is a Sudoku puzzle.

Sudoku puzzle is a logic based game in which you have to place the numbers, from 0 to 9,  in columns and rows.

Letter C is a Jigsaw puzzle.

Jigsaw puzzle is a puzzle with several pieces of different shapes that have to be fitted together.

Letter D is a crossword puzzle.

A crossword puzzle is a puzzle in which you need to fill the squares or spaces with letters of the write word.