How to play "Black or White"

Well, let's try the easiest one.
You can paint with black all nine cells around the number, when it shows "9".
Look at the number in the very center of this puzzle. It shows "9".

Then let's paint with black all nine cells around the number.
Next, look at the number in the cell in bottom right corner. It shows "1".

This cell is in a corner. That means the number shows how many of "four" cells around it must be painted with black. There is a cell painted with black already. So you can paint all left cells with white.

The number in the cell in bottom left corner shows "1", too. There is a cell painted with black in four cells around this number. So you can paint all left cells with white again.
Next, the number in the cell at center bottom shows "4". There are only six cells around it.

Three cells of six already painted with black, two cells with white. So you can paint the cell at center bottom with black.
Next, look at the number in middle left cell. That shows "5". There are only six cells around it, too.

Three cells (right of the number) of six already painted with black, one with white (under the number). So you can paint two left cells with black.
Next, look at upper right end. The number shows "6". There are only six cells around the number.

So you can paint all six cells with black.
The number in the cell in the upper left corner shows "4". A corner has only four cells. So...

You can paint all four cells with black.
At last, the number in the top-center cell shows "5". Look, five cells around it alreday painted with black. So the cell must be painted with white.

Completed!
Symbol of heart!
How was it!? Not such difficult is it !? At first, try this one yourself.
>>Try this one

This is a little harder case.
How can I solve it? First, look at the number in very center cell and its upside. They show "1" and "4".

You can paint with black only one cell around "1" (inner side of red lines). So, you must paint three cells (inner side of blue lines) with black. から、その上の「４」は青い線で囲んだマスを３つとも黒く塗らないと、全部で４つ黒く塗ることができなくなってしまうんだ（ちょっと難しいかな？）。

ということで、その３つのマスを黒く塗ってしまおう。
今度は、左上の「５」に注目。

同じような考えで、赤い線で囲んだ部分には、合計１つしか黒く塗ることができないから、「５」は、青い線で囲んだマスを4つとも黒く塗らないと、全部で５つ黒く塗ることができないんだ。

次に左上角の「３」に注目。
すでに３つ黒く塗っているので、残りの１つは白く塗ってOK。
もう一度、その右隣の「５」に注目。あと１つ黒く塗る必要があるけど、１つは白く塗ったので……。

残っている１つのマスを黒く塗ることができる。
それじゃあ、最初のどまんなかの「１」に戻ってみよう。赤い線の範囲内に、すでに黒く塗ったマスが１つあるので……。

残り８個のマスを白く塗ることができた！
あとは、全部解くことができそうだね。
こんな解き方もあるので、参考にしてくれたらもっと「シロクロドッチ」を楽しめるよ！