Freerice

Freerice, originally FreeRice, is a website-based application that allows players to donate rice to families in developing countries by playing a multiple-choice quiz game. For every question a user answers correctly, 10 grains of rice are donated via the United Nations World Food Programme (WFP). There are over 50 categories, including English Proverbs, Multiplication Table, German, Flags of the World, and World Heritage Sites. The categories can be played on up to five difficulty levels, from easiest to hardest, depending on the subject. A user's total score is displayed as a mound of rice and the number of grains earned.