How do you use passwords in Yu-Gi-Oh world championship tournament?

Answer 1

A password, or more officially "Card Number", refers to the eight-digit number that most cards have on the bottom-left corner on the card. Card Numbers, while serving no real purpose in the actual game, do serve a purpose in Video Games. By entering a card number found on a given card (usually in a "Password" selection screen), a player may obtain that card for their virtual collection, although various restrictions are placed on this depending on the game. Note that not all cards will have a Card Number on them, meaning these cards cannot be obtained in a video game. It may also occur that the video game assigns a password, instead of a Card Number to that card so that it may be available.

Answer 2

If you look at the bottom left corner of every YGO card it will have a serial number. Enter the code in the Password menu and you can get the card (though it costs).

Answer 3

You go to the store and hit the robotish thing. Then you enter the number at the bottom of a card. To get it thoe you need the real card and 80% of the package it came in.