I do not recommend this. I am GMO aka GameMasterZer0. I make the cheat codes that this guy uses as well as the codes you guys use with Magic Engine. The problem with patching the codes into the roms is the codes need to be tested for each game per stage. For example let us say your playing Rondo of Blood and you patch unlimited time, hearts and health. You beat the current stage and all of a sudden you notice the stage is glitched/stuck. The game factors the time, hearts and health remaining into your score, and since the rom is patched to have unlimited the game is constantly loop and never end. If your going to get this app I recommend having a back up of the files