What is the TacticsTempo game, how does it work?

According to the introduction of Dmitry Lamdan, TacticsTempo is a Board game on the Android platform. There is currently a 1.54 version released on Dec 18, 2017, you can see the details below.

TacticsTempo lets you improve your chess tactics skill.

What's new in version 1.54 Fixed little bug introduced in 1.53 (bad internet connection could cause application crash)