I use this in my World Language Exploratory Class during our Chinese unit (although this could be used at any level of Chinese). We use the website http://www.bbc.co.uk/languages/chinese/games/tones.shtml to practice hearing the 4 chinese tones. After practicing several times in class and giving students ample time to practice outside of class, we do this as an assessment in class. I play the website over my classroom speakers, have the students listen and circle the tone they think they hear. The back side of this assessment asks the students to write the characters for the numbers 1-20, another skill we assess them on.