题目本身的难度是这样报道的:
FreeRice automatically adjusts to your level of vocabulary. It starts by giving you words at different levels of difficulty and then, based on how you do, assigns you an approximate starting level. You then determine a more exact level for yourself as you play. When you get a word wrong, you go to an easier level.
词汇难度总共有五十级,但很少有人能达到48级的。