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FreeRice.com has been around for quite a few years and I try to take the time to play it on a regular basis as the game not only helps build your vocabulary and word understanding but each question you answer donates 10 grains of rice to the World Food Programme to help end hunger.
My last round I played on a lunch break until I was able to donate 740 grains of rice and reached level 25. I usually don’t have more time to play than to reach about level 25 but this was a good stopping point. There are only 60 levels in the game and the words get increasingly more challenging.
The game is simple, you are provided with a word and you have to pick the synonym that matches. It starts off very easy but gets increasingly more difficult (you of course can cheat and just google the words, or use dictionary.com but that would defeat the purpose).
So go to Free Rice and help give some free rice by donating some of your time to play the game.