Game Boy

Its unconventional gray-scale screen and chunky design proved that playability trumps specs, anchored by Tetris and Pokémon Red and Blue—each selling over 23 million and 10 million copies, respectively. These two titles alone generate more cultural impact than the entire libraries of several short-lived consoles. Its unmatched library of over 1,000 games and 18 years of production underscore its legendary status as the second-best-selling console of the 20th century.