A free app for Android, by Dinh Hung Vu.

This is one of the best relaxing games on Android! It may be your next favorite if you just want a chill and fine game that does not require you to take on heavy tasks.

The Crazy Teacher Math in education school game lets you explore the school and your goal is to collect all the Math notebooks you could ever find. It is such a relaxing game as you will just stroll around the campus without a time limit. Explore different rooms and see how amazing each one is. All you have to do is take your time and focus on looking for the required notebook.