Version 2.2.2 works fine on GNU Emacs 22.214.171.124 (i386-mingw-nt5.1.2600) when there is no challenge (e.g. arithmetic problem). But when external links are added, so there is a challenge, mediawiki doesn't alert the user or show the arithmetic problem. The only evidence of failure is that the page is never updated.
It says the package is available via ELPA; this doesn't seem to be the case.
It wouldn't hurt anything if you filled paragraphs, would it? Mediawiki ignores single line breaks.