理科問題3700 is a free Android app developed by Mejiro Publications that offers a comprehensive collection of 3700 science questions. The app includes 2500 one-question-one-answer format questions and 1200 multiple-choice questions. The questions cover a variety of topics, including biology, physics, chemistry, geology, and astronomy, among others.

The app is mainly designed for middle and high school students, but it also includes some university-level questions. The app is also suitable for anyone looking to test their general knowledge or learn new things. The app is perfect for individuals who want to test their knowledge, pass the time while commuting, or have fun with friends and family.

One unique feature of the app is that it displays the correct answer rate after each quiz. Additionally, the app includes a function that allows users to efficiently solve only the questions they answered incorrectly.

Overall, the app is an excellent resource for students and anyone looking to improve their science knowledge and general knowledge in a fun and engaging way.