Choose the operation mode and the difficulty first. Keyboard: up and down key movement, 'a' key slow, 'x' bomb. Mouse: the role moves to the mouse, click the mouse bomb. 先选择操作方式和难度。 键盘：上下左右键移动，'a'键慢速，'x'bomb。 鼠标：角色会移动到鼠标，单击鼠标bomb。
