I own a game genie, and it's pretty simple. You connect the game to the game genie and put it in the NES, making sure to push it in very far. You'll probably end up knocking off that silver bar if you still have one. Anyway, when you turn it on you get three lines for codes, meaning you can insert up to three codes. Now I have 4 code books with codes such as infinite lives, start on world 8, invincible, always tanooki, etc. Now it might not come with code books, so you can visit gamegenie.com (I think it's still a website) and it has codes for all the game genie games.