The best GBA games are getting easier and easier to find and play, thanks to the ever-growing retro line-up of games included in Nintendo Switch Online collections. They're well worth seeking out ...
This tutorial starts with some explanation of how the GBA works. It offered developers several modes for the display, so this is the first choice a programmer must make when designing the game.
Remember, these games aren't individual downloads but are bundled together in the Nintendo Switch Online NES, SNES, GB, N64, Genesis / Mega Drive, and GBA applications, which are 'free' to download.