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