Computer puzzle game is a genre of computer games that emphasize puzzle solving. The types of puzzles involved can involve logic, strategy, pattern recognition, sequence solving, word completion or, in some cases, just pure luck.
Before there ever were video games (as we would recognise them) there were jigsaw puzzles and the Rubiks Cube, today's puzzle game forefathers. The genre can be difficult to describe: the gameplay is usually abstract (but not always) often involving arranging geometric shapes to fulfil some goal or constraint. Often edge matching or colour matching plays an important role. Puzzle games usually strive to have a pick-up-and-play accessibility to them and to have an addictive quality.
Tetris is widely regarded as the pinnacle of this genre, despite not having any real advertising nor a cute character to garner attention. Solitaire and Minesweeper are worth mentioning because of the huge installed user base (they come bundled with the Microsoft Windows operating system).