A Review of Sound and the Human Ear
http://www.quia.com/ba/71597.html - test your knowledge of sound while playing battleship
http://www.quia.com/jg/504953.html - matching, flashcards, concentration and word searches
http://www.quia.com/rr/156565.html - a jeopardy-style game on sound waves and the human ear
http://www.quia.com/hm/247459.html - Inner ear hangman – How well do you know the ear?