FreeRice.com, in partnership with the Berkman Center for Internet & Society at Harvard University and the United Nations World Food Program, is an educational website that donates rice to the UN Program to End World Hunger. The way it works is that everytime you answer a question correctly, FreeRice's sponsors donate 20 grains of rice to help feed the starving and hungry.
FreeRice has been around for a while and started out with only an English vocabulary game. Recently, more games have been added: art, chemistry, geography, and math, English grammar, and language learning (French, German, Italian and Spanish.) Unfortunately, there's no Latin game yet, but your knowledge of Latin grammar and vocabulary will definitely help you with the English grammar and vocabulary games!