Me and nitro2k01 sat down at ellab yesterday to fix my gameboy. The screen was glitching etc. But when we had fixed it we decided to go all crazy on it!
1. Text has been removed with acetone
2. The whole casing has been frosted (secret method)
3. There are six leds that are powered from the internal batteries in it.
You'll have to figure out the thing with the number yourself.