Free Rice, the super popular vocabulary game that donates rice for every correct answer, has added a bunch of new categories. You can now play the game with vocabulary terms and identification questions from the areas of art, chemistry, foreign languages, math, and geography.

Knoword is a fun and challenging game that tests your ability to match definitions to words. In Knoword,  you’re presented with the first letter of a word, its part of speech, and the definition. You then have to fill in the correct spelling of the word. If you enter the correct word, you earn points. If you don’t get it right, you lose points.

You don’t have to register to play Free Rice or Knoword, but you can register if you want. Registering gives you the option to keep track of your work.