Participate in a simple vocabulary game, and for every correct answer 20 grains of rice is donated to the UN World Food Program! (The rice is paid for by advertisers.) The word game is truly challenging, but is designed to help you expand your vocabulary. According to the FAQ, there are 55 levels, but reaching level 48 and above is very rare.
So have fun... save the world... and you just might learn something in the process!!!
So far... I'm a 41... anyone up for a challenge???