Tetris

Possibly the most perfect computer game ever made, succeeding through pure simplicity and a flawlessly chosen set of four-block tetrominoes. Its core mechanics are so tightly structured that no single piece can be removed or altered without breaking the game, while its appeal is universal, free of any story or cultural barrier. The ever-increasing speed and inevitable failure guarantee a challenge every time, and even the iconic music is ultimately incidental to the experience.