PianoTile Puzzle:white black

If you like Simple Puzzle, then I recommend thie puzzle game.
The rule is just one thing,
If you touch the box, that has color which is white or black , then
other sides box's color is change . (if box's color is white, change to black versa is the same)

It's really simple. Isn't it?
But unlike your think , It's very hard to solve as level up.

-Just playing without time limit!
This puzzle doesn't have a time limit. Just enjoy in your free time!
-Really simple, but beautlful visual
This puzzle made of by just few color. But
-All Free
All puzzle Stage is free. You don't have to pay!
-Beautiful Sound
This Game use the piano sound. So When you playing the game, you can feel your ear is very happy.