im also from hong kong but since i occasionally went to mainland china to visit my relatives i get to learn the simplified script by just reading at signs and news. nevertheless its a good quiz, would like to see it in traditional chinese tho!
Some of these should be fixed. Please accept "tree" for 木. Please accept "chinese word" for 汉字. Also, a lot of these aren't really a translation, they're basically just pinyin. Like Beijing, Xian, Taiwan, Tofu, Shanghai, and Hua Mulan.
Otherwise, nice quiz!