I have this game on my iPod Touch (5th generation) called Sonic Dash. It features Sonic, Tails, Amy and Knuckles. I was wanting to find a way to add in another character, Shadow the Hedgehog, to play the game as.

So my question is, is there a way to get into an iPod/iPhone game (like the code, perhaps?) and add in a character at your own doing? I've got very little knowledge of computers/tech stuff.

Thanks!