OK, I was curious so I tracked down a source [1] > The process of searching for working codes would have been slow and tedious, though as Menzies explains, the

OK, I was curious so I tracked down a source [1] > The process of searching for working codes would have been slow and tedious, though as Menzies explains, the team came up with little tricks to speed things up. "I wired up a Commodore 64 to control a prototype Game Genie using a pop-up utility on the Commodore, so we could type codes directly in hex, which was a big improvement over using the NES controller. Also we managed to daisy-chain two Game Genies so we could enter up to six codes at once, which sped things up a bit. [...] > "It wasn't very glamorous," adds Rigby. "And it took about three days to go through a game, sometimes longer for some of the popular RPGs. The thing I remember most was the very first dev kit; it was a few rows of switches soldered onto the top of a black 5.25-inch floppy disk box. They were binary switches and you had to flick the position to 0 or 1 to represent the address and the value you wanted to change to." [...] [1] - https://www.nintendolife.com/features/the-story-of-the-game-genie-the-cheat-device-nintendo-tried-and-failed-to-kill https://www.nintendolife.com/features/the-story-of-the-game-...