We check this website, now yugioh-wiki.net is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is yugioh-wiki Down Right Now? - NO! yugioh-wiki is up!
If you have problem with access to site yugioh-wiki, and domain yugioh-wiki.net is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).