FreeRice is a click-to-donate site where this exact same learning experience is used to sell ad-space to support the World Food Programme, donating 10 grains of rice to the third world for every correct answer. Vocabulary.com copies the game exactly, but removes the charity aspect that makes the game productive. Ultimately, the only thing it does is divert potential supporters away from a fantastic humanitarian effort.
0/5 stars. Do this on FreeRice instead.