People who use basic Walkthroughs from the internet, often have trouble with this game because there are two very different modes. Often somebody will be using 'Hard Mode' and will download a Walkthrough for 'Normal Mode'. So when they are looking for what they think is a Gold Card, they are actually searching for a Costume Piece.

A lot of the locations of Costume Pieces and Gold Cards are switched around in this mode. It is vital to remember that, or you may end up wasting hours of your time looking for things that you don't actually want.