A slightly upgraded version of the Game Boy that came out a good nine years after the mono's release. As the name implies, it can do color graphics, and has an easier-to-see screen. Much of the Color's library consists of ports and remakes of NES/SNES games. Most Color games will play on older Game Boy models in monochrome, but there were some later Color-only titles.
Balloon Fight GB | Game Boy; Game Boy Color; Super Game Boy enhanced
The Blueberry Hill: Japan only colour version of
Balloon Kid, with the ability to save game progress. It's an extension of the Balloon Trip mode from
Balloon Fight, and is even more wonderful than that sounds.
Super Mario Bros. Deluxe
vamos: They kept things the same size but added the ability to look up, down and ahead. Although none of these are particularly needed, I didn't have any problems with leaps of faith. The challenge mode — finding hidden coins, getting a certain score etc — is really well done and excellent for playing in short bursts, i.e. perfect for a handheld. Plus there's the SMB2 / Lost Levels in there too. I had a great time with it.
showka: They NES sprites seem cooler on the GBC screen, and it always felt like they made the colors more poppy. The extras were cool too.