One of the difficulties students of Chinese characters face is that many components within the characters look very similar. It's easy to accidentally substitute them for one another, or swap them places. Zen Hanzi focuses on addressing component substitution mistakes that both students and native speakers tend to make when writing Chinese characters. In Zen Hanzi you have to select from similar looking components and place them into the correct slots, creating a fun drag-and-drop experience. Zen Hanzi is based in research on effective learning strategies for hanzi and was shown to be significantly more effective in teaching Chinese characters than Quizlet. You can read all about the science behind this game in this peer reviewed academic article: https://www.researchgate.net/publication/363367306_Zen_Hanzi_A_Game_for_Raising_Hanzi_Component_Awareness