但是他不能移动到红色的瓷砖上，只能移动到黑色的瓷砖上。

But he can't move on red tiles, he can move only on black tiles.

youdao

每一块瓷砖只有两种颜色，红色和黑色。

Each tile is colored either red or black.

youdao

每一块瓷砖只有两种颜色，红色和黑色。

Each tile is colored either red or black.

youdao