Black Puzzle 24

The second version of a very popular puzzle game appears!
The poisoning puzzle game downloaded all over the world!
How many seconds can you dye all black in?


【How to play】
・It is a game to change all the buttons into black.
・A color trades the button when involved.
・1 stage is clear when I make all 24 buttons black.
・15 stages, it is all no side when I clear it.
・I compete for the time that it took to no side.
・Whenever a stage goes up, the kinds of the color increase.