There is a website where you can duel for free. It is http://gameking.hudzilla.org/gkc.php But, there is a problem. The website is down. It was down from June 2008-January2009. It came back, but is down again as of March 2009. I don't know how long it will be down. But, if it comes back online, it will be worth the wait. If you sign in, it says at the top that you need firefox or it will not work. NOT TRUE. It works just fine. Also, to build you deck, It gives you a list of every card made, even the god cards, except for the cards in the new series, Yu-Gi-Oh 5Ds. You just choose cards from the list given to you. From the Alien series to the Venom and Volcanic series, it has it all! I can't wait for it to come back on.
You can try Dueling Network. It's a free, no download required, dueling simulator. Many different players play on it, and you may face them in battle. You have all the cards currently released in your disposal to use and able to build and save multiple decks to use. You can do pretty much everything you could do in any normal duel and is a good way to test out decks or just play for fun.
Dueling network is the main one people use. However that does mean there are a lot of people who duel without knowing what they are doing....
dueling network
yugioh-online.com it's either .com or .net. The only downside is your first ten duels are free, the rest you have to pay for. There is also the kaiba virtual duel system at seto-kaiba.com and there is the xenocreative.com dueling system which I like ^-^
Its free (but you have to download), LackeyCCG and Byond (Duel Monsters Genesis).
yugioh cards are made by paper so i will tell you how to get your yugioh cards for free all you have to do is go to i make yugioh cards and you can make your own yugioh cards so now you kown how to make your yugioh cards.
0472712565 does not work
I think you can print them somewhere on the site but I'm not sure but you could copy and paste it on Microsoft stuff this website has 0 viruses and it is an awesome website you can make your very own yugioh cards or make a real one It's http://www.yugiohcardmaker.net/
yes dueling network is free But you have to input a credit card. It won't let you duel without one.
there is no free yugioh online duel passes.
you need to win at lest 50 duels in free duel mode
yugioh-online.com it's either .com or .net. The only downside is your first ten duels are free, the rest you have to pay for. There is also the kaiba virtual duel system at seto-kaiba.com and there is the xenocreative.com dueling system which I like ^-^
Its free (but you have to download), LackeyCCG and Byond (Duel Monsters Genesis).
Beat 50 people 5 times in free duel
you first make a deck then you go to duel room
There's DevPro (type in devpro yugioh), you can download it or: Dueling Network (no download, just sign up)
The best I have played is LackeyCCG and even better Byond (Duel Monsters Genesis)
You have to defeat three opponents 5 times each in Free Duel (World Championship mode).
The dueling dragons ride is free, once you are in the park.
KCVDS isn't very good, but you don't need to pay. But yugioh online is one of the greatest duel simulators, but it can be boring at times. It is free to download and play but to duel you will need a DP (Duel Pass), which costs money, but if you don't have any you can watch the other duels. You can download and sign-up for FREE, but Dueling costs real money, and there's no way outta it. I improved the grammar and wording of the original answer, because the meaning was unclear at times. Grammar fixed. Tradecardsonline is not a game site. It has game area but it was made for trading. And there can only be around 10 matches at a time and its hard to get one if u don't pay money. Okay, just so you know, tradecardsonline.com is a game website. That is what it's main focus is. You create a free account. Build a deck, and once you have built it you can go to "play online" and it opens another page where you can play other people if the tables are open.