He's talking about games on emulators like Nesoid. To fix the problem you're experiencing the developer needs to add support for the screen size.
it's not screen size issue! I had and played those games for over a month then whenever I open them they are too big (always you have zoomed to top left) so I just see top left on the full screen but very big and can't see anything else offcurse. I am on moto droid stock and I tried all the normal methods: repoot, remove battery, uninstall all the games and reinstall. please help!
It is a screen size issue. The settings in your emluator are set for a larger screen. The top left corner of the screen is "fixed". It is weird the screen is set larger than your physical size, usually the game is sized for a screen smaller than the droids. Look at it this way:
Here is Oregon Trail, notice the black bar on the right side of the screen. My physical screen is larger than the screen the game is set up for.
This is the same picture, when the game screen it larger than the physical screen. Notice the top left corner is "fixed", and all you can see is the top left corner.
You need to find a setting in your emulator to change.