What is the Diamond Sweeper 77 game, how does it work?

According to the introduction of QB'k Games, Diamond Sweeper 77 is a Puzzle game on the Android platform. There is currently a 1.0.0 version released on Dec 21, 2017, you can see the details below.

Clear up a path to the diamonds in two stages, first by removing, then by dragging colored tiles.
Simple concept, yet requires good planning skills.
Improve your planning and mapping skills the fun way.

Features:
- 40 randomly generated levels of increasing challenge
- Local and on-line leaderboards to compare scores with your friends
- Unlock up to 7 achievements.