Code Lyoko Q&A

As I Stated in the title i need a run thru walls/barriers so i can get past 1st time in Code Lyoko, But i have the game too and easly beat it.

My friend told me about this cheat about how you can make all charecters dark and be able to take control of monsters.He said he forgot how to do it excpet where you have to beat all 3 files 3 times.Does anyone know this cheat.NOTE:Do NOT tell me to use an act...