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Does anyone know which games use the Konami code and what the code does in those games?
I hear people talking about it from time to time, but I've never been able to unlock anything in any games that I own.
Do Nintendo games use it?
NES Konami games do. Contra is the most famous one to do so. Not sure about other games.
Here are all the Konami games that use the code (https://en.wikipedia.org/wiki/List_of_Konami_code_games) and here are all the other games or apps or websites that use the code (https://en.wikipedia.org/wiki/List_of_Konami_code_games/Non-games). As you can see it's a pretty popular code, definitely the most well known cheat code in video game history at least.