Mercury level:
Successfully complete the game in expert mode. After defeating the Earth Boss, you will be transported to Mercury. The unique enemy is called Leecher. The Special Missile is fairly useful, called the Silo Attack, where missiles appear from the ground and fly straight up. Unlike the Vertical Burst, they only hit one alien on contact. The Boss is a easy if you have Double Shot. Meteors fall from the sky and take two hits. The more damage you take out, the faster the space rocks fall. Without Double Shot it is slightly more difficult, whereas missing a rock disables your next shot until the rocket leaves the screen or it hits something.
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