Funny how simple ideas can be so interesting. Like guessing the meaning of words and making a miniscule donation every time you get one right.
Free Rice is just that. Every time you know the meaning of an English word right, the organisation donates 10 grains of rice to the developing countries. Doesn't sound that much, does it? But just yesterday the total was about 150,000,000 grains of rice - that's in one day. Total number is now close to 3,5 billion grains, which is quite a lot considering the site opened October 7th.
The game is surprisingly addictive because it adapts to your level, so it's not just random numbers, rather it pushes you to your limit all the time.
Here's how it works: First you get a few random words. Your result with these define roughly your level. Levels are simply decided by how many people get each word right, so the fewer know a word, the higher it's level. Every time you get a word wrong, your level drops by one. If you get three consecutive words right, you rise a level.
My level seems to be about 30, fluctuating between 26 and 35. The only gripe I have about this site is it doesn't "remember" you between sessions, so you can't see you totals. Apart from that this is a great way of having fun, learning AND donating something to the poor. Not a bad effort at all.