For a wii, make sure your wii is Homebrewed, and it has all the cIOSs installed (usually 36, 222 and 223 ( I have 36, 222, 223 and 165(which is custom made one))). Get USBLoaderGX or some other usb loader, and go grab your game and install it onto the USB. Go ahead and open up the ISO with program like Trucha signer on your PC, save an ff file and use ffviewer to edit it. Start off by editing small details, like writing a code to display some text which would be rendered in the game. Then go ahead and start creating variables and just experimenting with others, for example go grab a float and change its value. Save the ff file and use trucha signer to replace the existing one with the edited one. Make sure you back it up before to not screw everything up .-. uhm then go ahead and sign the game. Put it onto the USB and try to play it with the USBLoaderGX. This is just a start to breaking into the game and altering it. Hope I helped?