What is the Kings Kollege: Fillz game, how does it work?

According to the introduction of Armor Games, Kings Kollege: Fillz is a Puzzle game on the Android platform. There is currently a 1.2.1 version released on Sep 18, 2016, you can see the details below.

Select tiles and drag and drop them to the highlighted target cells. You can select multiple adjacent tiles and move them together in their original positions. Find the right combinations to solve the puzzles in as few moves as possible. New mechanics are added as level sets are unlocked.

What's new in version 1.2.1 1.2.1
Bugs fixing and improvements
1.2.0
Bugs fixing and improvements