The SNES game library is full enough, but there are Super Nintendo games that were canceled or only in Japan. But with emulators, you can play them.

Still, the mere fact that you can now play a game designed for a classic console that never technically existed is a testament to the "do it because you can" spirit of the homebrew community.

To understand how to build a Game Genie for an Atari, you first have to understand how a Game Genie works. The hacks for a Game Genie work by replacing a single byte in the ROM of a game.