http://mste.illinois.edu/java/michael/magicsquares/
http://www.shodor.org/interactivate/activities/ArithmeticFour/
http://www.shodor.org/interactivate/activities/SimpleMazeGame/
http://nlvm.usu.edu/en/nav/frames_asid_269_g_4_t_1.html?open=instructions
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