I am using my game genie daily these days. My 4 year old does better on my old Nintendo since the controls are so basic. I had to replace all the capacitors on

I am using my game genie daily these days. My 4 year old does better on my old Nintendo since the controls are so basic. I had to replace all the capacitors on the nes before it would work and all my old games didn’t work right away they had to wiggle back and forth before making a good pin connection and I assume wear some of the tarnish off since the games since start better no messing around. I have always wondered how the game genie worked on a technical basis I will have to see if there is anything out there on the matter.