The Game Boy Color, or GBC, is a handheld console made by Nintendo. It is essentially a Game Boy Classic, except with the much needed capability of showing color, it is also slightly smaller in size, and a fair bit lighter than the classic.

Grand Theft Auto games for the GBC

Wikipedia has an article on:

Game Boy Color

• Grand Theft Auto 1 (1999)
• Grand Theft Auto 2 (2000)