FreeRice, the website provides the rice for the world hungers, but there is a condition: If you get each word right, they donate 20 grains of rice through United Nations to help end world hunger. The rice is payed by the ads.
I get 20 right words, so I also donate 400 grains of rice, and my word level is 30, according the 20 right words out of which I answered. The highest level is 50, but few people get level above 48.