Okay , I had to try out a few methods to get one that worked, but if you want 500 credits without having to pay, all you have to do is phone the habbo credits line (0906 900 9100 ) and when it asks for a code type in Lost_witness's account code which is 17881083 and then it will ask you to type in your name on habbo. When you have done that 500 credits will be in your purse and you won't be charged for it!!