oh right. Forgot to share this.

Dueling Network

It's pretty much the best freely available online yugioh game out there. The gameplay is all manual, so if you're used to the automated games you'll probably be a bit confused. You'll get used to it in due time though.

Take precaution though: for your own peril, I'd advise you to choose a safe password if you don't want your account stolen. I've thrown together tools that have broken into more than a handful of accounts in the past. Including a mod. And that leads me to this brief sub-story. I once got into an admin account and banned as many users as I could (and unbanned a couple of mine). As a consequence, they reset their servers and I lost access to the account. I was also banned from my main, Protozoid.