光より真っ黒が好き

When you press a button separated by squares, the color of that button and the top, bottom, left, and right buttons will change.

When you finally change the color of all buttons to black, the game is cleared.

The number of squares and the number of colors that change can be changed in the mode.

It is also possible to include blocks, and although the blocks themselves have no bearing on clearing the game, they can change the gameplay slightly because they cannot be pressed or their colors change.