Manga High is a free games-based maths teaching resource.  It is of very high quality!  The games look credible, and are attractive to pupils, who are motivated to play them.

As a teacher, Manga High provides you with a number of tools to monitor and assess the progress of your pupils.  You also get to assign different games or challenges to pupils and pupil groups.  (This is even better when the stars at your local authority set up all your pupil logins for you!).

(url – http://www.mangahigh.com/en_gb/)