Talk:Challenge Patches/@comment-29331244-20140903013038/@comment-24808864-20140903014600

He is the link to one in particular. Eventually all will just be categories.

http://khanacademy.wikia.com/wiki/Category%3A5th_grade_math%3A_Algebraic_thinking

Perhaps this user did not realize it because we do not have a good wiki navigation to get to it yet.