HOW DO YOU PLAY YU-GI-OH ? - Yu Gi Oh Toys

Go to this website:
http://www.yugioh-card.com/en/gameplay/

Right below 50% of the webpage there is a 2.60 Mb downloadable rule book.

What is the Yu-Gi-Oh! TRADING CARD GAME?
In this game, two players Duel each other using a variety of Monster, Spell, and Trap Cards to defeat their opponent's monsters and be the first to drop the other's Life Points to 0.
Here you can download the official Yu-Gi-Oh! TRADING CARD GAME rulebook.
It's important to learn how to play correctly, so you should read this rulebook before playing if you're new to the game. Understanding the rules will help you make the best use of your cards, so keep the rulebook handy during your first few games.

Go to the site find this text and click the download bar.