Free Rice is another good non-profit money-for-time site. I like it. The experience is clean. The game is mildly addictive. The vocabulary is pretty tough–I haven’t been able to go much above the low-mid 40s.
At this point, people have donated 1,330,639,890 grains of rice, which is roughly equivalent to nearly 27 tons.
HighContrast 
like the game and feel good that I donated 300 grains of rice. Nice time killer, feel good game
Quite amusing, and insanely difficult at level 48…
I like the way they adjust a word’s difficulty level depending on the right/wrong scores, but I imagine that can get skewed by a variation in the intrinsic rarity (*) of a word -vs- the available search results that give a usable definition.
* English is an odd language, tu sais bien 🙂
Well, Mr. Harwood, sir, that’s what you get for getting up to level 48. 😉
Cool game… thanks for sharing.. you are correct gets harder at 43+.. wonder what the highest is…