You are given a word and four definitions. If you are correct, 20 grains of rice are donated by the sponsors whose banners are displayed. (You see the rice mount up.) There is a little speaker which will pronounce the word if you click it, helpful. (I've been mispronouncing or perhaps alternatively pronouncing some words: AARgh!) I keep a running list of missed words or words I want to check further. The FAQ says the highest level is 60 but most don't get past 50. So far my best level has been 48 -- but I've only been playing two days. More important, I've help donate over 4000 grains of rice! Beat me!
I've added a smaller button to my side bar for your/my ease when this post gets buried, but try it now: