It appears that all of the fast-paced word creation action in recent months has resulted in Wordament
needing a long break, as the web-based version of the popular title is no longer available to play.
A recent tweet
from the official Wordament
account, in response to a gamer's question, explains why Wordament (Web)
has now been "retired":
It retired. Xbox stopped supporting web-based games at the end of January. While we were disappointed, but it was a beta.
None of the other versions of Wordament have been affected by this change.