If you are trying to create your own code to try and get free time...you will never be able to do that in a million years.
First of all, the chances of getting a code right are about a million in one.
Second, in order for a code to be active, it has to be purchased somewhere for it to be activated.
One of my friends stole like 100 xbox live points cards and tried entering them but none of them worked. This is because they have to be activated by a cashier.
Just give up on this and pay for the game.
