A free app for Android, by Руфер.

This is an educational application for people to learn non-Euclidean geometry, which is one of the most beautiful, exciting, and important geometric concepts in the world.

This app is created to be used in schools to teach students and teachers, and also to be used by people who want to learn more about this topic.

The main reason why this app is created is that the topic of non-Euclidean geometry is not often used in games. However, this concept opens up many possibilities. 

This app is not only about mathematics and geometry but also about people who like to explore new worlds.