The document outlines the history of Nintendo's handheld game consoles from 1989 to 2009. It starts with the original grayscale Gameboy in 1989, which sold over 150 million units and was followed by slimmer, pocket versions and ones featuring color screens. The Gameboy Advance added additional buttons and compatibility with earlier games. Subsequent models included backlit screens for low-light play, rechargeable batteries, and size reductions to make the consoles more portable. The Nintendo DS line began in 2004 and added dual screens, compatibility with Gameboy Advance games, and with later models, brighter screens, smaller sizes, and more applications like built-in cameras and WiFi connectivity.