From WiKirby, your independent source of Kirby knowledge.
The Game Boy Color is a portable handheld console released by Nintendo in 1998. It is essentially an upgraded Game Boy; its main improvement over the original Game Boy is its color screen, capable of displaying up to 56 colors on-screen and 32,768 colors total. It is fully backwards-compatible with all Game Boy games, and could run these games with a number of pre-set palettes. Kirby's Dream Land, Kirby's Pinball Land, and Kirby's Dream Land 2 in particular had special Game Boy Color palettes designed specifically for them.
Additionally, certain Game Boy games (distinguished by their black cartridges) were designed to take advantage of the Game Boy Color's expanded features, and other games (distinguished by their clear cartridges) were exclusive to the Game Boy Color altogether. Only one Kirby game — Kirby Tilt 'n' Tumble — was developed specifically for the Game Boy Color. Kirby Family was a planned title for the system, but it was canceled.