Yu-Gi-Oh! Online is an online PC game released in December 2004 by Konami that is based on the Yu-Gi-Oh! Trading Card Game. It was first distributed with the February 2005 issue of the U.S. Shonen Jump. In the game, players can chat, duel, and trade cards with each other.
Once you download the client, register a free account right here.http://www.yugioh-online.net/top/english/intro/rule-deck-duel.html#