游戏说明：

游戏控制

Drag and drop the pieces holding the left button of your computer mouse.
Right click while dragging a piece to put it back where you picked it up from.
Double click a piece to remove it from the grid.
Mouse wheel up or down to adjust background brightness.
B or middle mouse button to change the background color.
R key to reset the level.
Escape key to exit current level.