数学クイズ なん度 is a popular math quiz app that offers a variety of math challenges, from basic to difficult. It has been ranked as the top education app and has been featured on numerous TV programs.

The app features three different quizzes: "数学クイズ【 なん度？ 】" focuses on finding angles in various plane figures, "数学クイズ【 面積は？ 】" challenges users to find the area of different plane figures, and "数学クイズ【 いくつ？ 】" asks players to fill in the missing numbers in number sequences.

The app provides a range of levels, starting from basic questions in the early stages and progressing to more challenging final stages. Users can also use their fingers to write calculation notes on the screen and receive rough hints by pressing the "?" button.

Please note that if you are under 12 years old or using the app on a device owned by a school or organization, you will need to purchase the in-app "Ad Removal" to disable advertisements.

Overall, 数学クイズ なん度 is a popular and engaging math quiz app that offers a variety of challenges for users to improve their math skills.