The Game Boy, launched in Japan on April 21, 1989 and in North America on July 31, 1989 at $89.99, was Nintendo's iconic 8-bit handheld that revolutionized portable gaming. Powered by a Sharp SM83 processor with a modest 2-inch monochrome LCD offering four shades of gray. Despite criticism for simple graphics versus color rivals like Sega Game Gear, Atari Lynx, and TurboExpress, Game Boy's strategic advantages proved decisive: 10-12 hours on 4 AA batteries (rivals 4-6 hours on 6 AAs), $89.99 price, brick-like durability, and an unrivaled software library. Bundled Tetris sold 35+ million copies. Combined with Game Boy Color, it sold 118.69 million units. Legendary library: Super Mario Land (25 million+), Link's Awakening, Pokémon Red/Blue/Yellow, Kirby's Dream Land, Metroid II, Final Fantasy Adventure. Game Boy's success validated handheld gaming and cemented Nintendo's decades-long dominance.