Players P1 and P2 can use the same keyboard to compete against two computer-controlled aliens. It is recommended to play on a computer. If playing on a mobile phone or tablet, please use landscape mode. 玩家P1與P2可共用同一鍵盤，對抗兩名電腦控制的外星人。 建議在電腦玩，如在手機或平板玩請使用橫向模式。