Well, the Gameboy Advance has such poor lighting that it is impossible to use in any conditions except ideal. There are kits for sale for about $25 to fix the problems (backlit or frontlit). Check out www.lik-sang.com

Interestingly enough, Nintendo has put out several versions so far without fixing this basic problem (or dropping the price).

They also have a problem in a lot of games where if you pause it, the screen turns darker, burning up the batteries faster.

-Biscuits