Excerpt: Another great use of the Game Boy Color (and only the Game Boy Color, mind you - Caesars Palace II doesn't work on any other Game Boy units). There's a lot of closet high-rollers out there who can't afford to lose their life savings on a week at Las Vegas. This has created a nice market for portable gambling games. Most of these have bad graphics, horrible sound, and only offer one game. Enter Caesars Palace II .