"Unwritable and Embarrassing Brain Training Kanji Quiz" is an iPhone app developed by Gakko Net Inc. It falls under the category of Education & Reference and is available for free. This app offers a collection of 1,000 challenging kanji quizzes that will put your writing skills to the test.

With words like "shirasu" (to wrinkle), "yaochou" (night market), "akubi" (yawn), "muchuu" (in a daze), "osanai" (immature), "moguru" (to dive), "itoko" (cousin), "zayuu no mei" (expenses), and "shinise" (old-established store), among others, this brain-training kanji quiz is designed to challenge your ability to write kanji characters correctly.

The app is perfect for adults who want to give their brain a workout and improve their writing skills. It can be enjoyed for free and is suitable for kanji enthusiasts, those looking for brain training, or anyone who wants to kill time. Start playing the "Unwritable and Embarrassing Brain Training Kanji Quiz" today and put your kanji knowledge to the test!

Please note that if you encounter any issues or have any feedback, you can contact the developer through the in-app contact form.