飞船外星人-2D游戏
点击 play开始游戏,随着消灭外星人,你的得分也会增加,当所有外星人都被消灭,会出现新的外星人,并且相应的子弹速度和外星人的移动速度都会增加,屏幕上端的记分牌分别显示飞船剩余个数(也就是我们常说的你还剩下几条命),最高得分,当前得分和当前的等级。解释一下什么叫做当前的等级--随着外星人被消灭,当前的等级会一步一步的提高,等级的提高也就意味着,子弹速度和外星人移动速度的提高
飞船外星人-2D游戏
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