What is the A to K Free game, how does it work?

According to the introduction of Happy Planet Games, A to K Free is a Puzzle game on the Android platform. There is currently a 1.0.11 version released on Aug 28, 2015, you can see the details below.

A to K is a clone of the popular 2048 game using letters of the alphabet instead of numbers for the pleasing and very addictive puzzle gameplay. Swipe the game board to move all tiles in the indicated direction. When identical letters meet, the merge into the next letter of the alphabet. Turn A's into B's, B's into C's and so on, and see if you can reach the game winning K tile.

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