Forza Motorsport 3 - Trucos y guías: ¿Estos trucos funcionan?

Ignoraba que existiesen trucos de combinaciones de este juego. ¿Alguien sabe si los trucos que ha publicado recientemente GF funcionan? Parece que hay que introducirlos en la pantalla de título:

100% discount all cars	Up, Left, Up, Up, Up, X
Change laps	Left, Left, Left, Up, B
Driver level 50	Up, Up, Up, Left, Left, X
Get a 100% discount on all parts	Down, Up, Up, Left, Down, X
Have $800'000'000	Down, Up, Left, Up, Right, X
Have a free random prototype car	Left, Left, Up, Up, X
Infinite money	Left, Right, Right, X, B
Unlock all events	Left, Up, Up, Right, X
Unlock an endurance	Down, Left, Left, Right, X.