Simplify the following text for a Grade 5 native English-speaking person.
Original: When an older Game Boy or Game Boy Color game was inserted into the cartridge slot , the switch would be pressed down and the Game Boy Advance would start in Game Boy Color mode , while a Game Boy Advance cartridge would not touch the switch and the system would start in Game Boy Advance mode .
Simplified: In Slot 2 , it can accept Game Boy Advance games , but not the older Game Boy or Game Boy Color ones .