If you're asking if you can play American games on a UK Game Boy Color, then yes, you can. The Game Boy Color is not region-locked, unlike Nintendo's later handheld consoles.
no
Yes you can.
Yes, you can
No, they do not work
Yes, you can usually play the last generation of games for each Nintendo system (Game boy colour plays game boy, game boy sp plays colour, game boy ds plays sp, etc.)
Yes, but color games can't be played on a normal gameboy.
yes, the game boy colour games actually work better on the game boy advance sp!
Game Boy Games can be played on both the GameBoy Advance and the GameBoy SP.Game Boy and Game Boy colour games can not be played on a DS though -through the carriage slot.
No
yes you can i have tried it but the gameboy colour games stick out a lot
if you are talking about all of the Game Boy Colour or Game Boy advance Pokemon games, then no. im not sure about the ds games
Most Game Boy games are in colour. To find out more information, check out the official Game Boy site. Also check out a site such as Amazon which will have reviews of Game Boy games.