After giving the game genie a really good cleaning. Dad and I found some pliers to break off the tabs. After a while we nearly got the tabs off. We tried fitting some games in The games fit in on one side but not the other. We decided on drilling the last couple of plastic pieces off. Dad went to get the drill while I continued to get the plastic bits off. By the time my dad came upstairs with the drill, I was able to fit my Super Nintendo games into the slot.
I randomly put in a code for the Secret of Mana and all of the characters had about 500 hit points apiece.
Now I have to look for the Codebook.