We already know there are 3 games already have GBA mode to unlock that GBC mode won't unlock. Legend of Zelda: Oracle of Age/Season Shantae but why 3DS doesn't? I am pretty sure much early when first 3DS come out, alot of people have able to chance download GBA game in 3DS before they close. But one problem that we need answer this. If they already release GBA game in 3DS before Legend of Zelda: Oracle of Age/Season & Shantae release, then why Nintendo didn't realize it while they already release 3 GBC game already have GBA mode but not support in game while they already release GBA game on 3DS? What if Nintendo have hidden secret about GBA mode when you play 3 GBC game while thousand of people try to find secret combination button to use GBA mode? We already know press L button with Select button to make GBC mode. When you use any GBA console in GB/C game, you press L and R to turn full screen and back to normal GB/C screen. But why not 3DS support it for GBA mode? Hope our question will be answer in future. If not, then guess we have to use old fashion way. Use emulator or real console GBA.