Fun, funky and intellectual websites

How fun is it to find a website that tests one's mind or just makes fun at a higher level than the base stuff found in print, TV or other media? IT'S LOTS OF FUN!! Just in case anyone didn't know the answer ;-)

So here are two websites that I have found to be intellectually fun. One even helps people - how can that be wrong?

www.spogg.org - this is a grammer site.

http://freerice.com - this is a site that tests your vocabulary, and each try they will donate one grain of rice. So play often and have fun.