Freerice.com is one of the most innovative attempt at removing hunger from the earth. The site allows you to play a vocabulary based game in which you are required to guess the meaning of the word. For each word you get correct, it donates 20 grains to the United Nations World Food Program. This rice is then used to feed millions of the hungry people in the world.
The word game itself is good enough to take you to the site. Considering that you will be contributing to a noble cause …