尝试通过向其发射心脏来爆炸不明飞行物。击中尽可能多的外星人，以增加您进入新水平的机会。屏幕右侧的不明飞行物的救生圈表示您的表现如何。使用左右箭头键移动，并使用空格键进行射击。
Enable Flash in Chrome settings. When Flash is disabled, the label will read " Block sites from running Flash ".Click the toggle to enable flash and the label will read " Ask First ". Shown like the following:
Now Click And then,click " Allow " in the box that appears in the top-left to play the game.Shown like the following:
