WARNING: Each list contains almost 20,000 usernames each. it is very possible your browser may crash trying to view them.
sitemapUsers0.xml and sitemapUsers1.xml are empty.
http://www.scirra.com/sitemapUsers2.xml
http://www.scirra.com/sitemapUsers3.xml
http://www.scirra.com/sitemapUsers4.xml
http://www.scirra.com/sitemapUsers5.xml
http://www.scirra.com/sitemapUsers6.xml <- May or may not contain usernames, my browser crashed trying to open this one specifically so it may contain more than 20,000.
I don't know if this is an actual issue or not, but just in case.
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oh, well it dosen't hurt to try at least.