One of Nintendo's biggest successes, the Game Boy came to the U.S. market in August of 1989 and sold one million units in just a few weeks. Its pack-in game, "Tetris," is one of the most popular games of all time.
Despite the fact that it was black and white (realistically green and light green), the Game Boy surpassed the competition in popularity. Many of the early games were revamped versions of their NES counterparts, such as Super Mario Bros and Kid Icarus, but Game Boy originals, such as Pokemon have gone on to become extremely popular.