You're right that N64 did not have Game Genie (Super Nintendo and Sega Genesis also did), but N64 did have Gameshark, which was the spiritual successor to Game

You're right that N64 did not have Game Genie (Super Nintendo and Sega Genesis also did), but N64 did have Gameshark, which was the spiritual successor to Game Genie (along with Action Replay). There is a project (https://github.com/JCR64/GoldenEye-007-N64-Gun-Game https://github.com/JCR64/GoldenEye-007-N64-Gun-Game) that adds games to Goldeneye via Gameshark