Level 60 (FreeRice.com)

Achieved playing normally (not setting the level). 41,860 grains of rice donated, which amounts to 2,093 turns. That is a lot.

I installed two FireFox extensions which aided in word comprehension and retention:

1. Wikipedia Lookup Extension: https://addons.mozilla.org/en-US/firefox/addon/744
2. Dictionary extension: https://addons.mozilla.org/en-US/firefox/addon/7869
   

Link: http://FreeRice.com

In searching blog posts for others who have played, I came across a suggestion to play http://aidtochildren.com. After all the difficulty with freerice.com, I mastered this one in 20 minutes: