Space Invaders

This is the Skip Gain version of Space Invaders, featuring bullets that move three times as fast. For the original version, go here. For the easy version, go here.

Features of this game:

• As you hit aliens, they disappear and you score points.
• You may stop and start the game in the middle.
• To improve game play, the missile model switched from the "limited number of missiles" model to the "limited number of missiles in air" model. Instead of 60 disposable missiles, you get 3 reusable ones.
• There are three new Alien types:
• ArmoredAlien cannot be killed by a hit on the side.
• TinyAlien flies in circles to dodge your fire.
• ShootingAlien shoots back.
• Two of the original types have also been changed:
• DieHardAlien (green) regenerates if damaged but not killed.
• ExtraAmmunitionAlien (red) gives one extra reusable missile (instead of five disposable ones) when hit. Note also that the army continues to move whilst the ExtraAmmunitionAlien blinks.
• Some aliens are more likely to appear in some places than others.
• As in the original game, flying saucers periodically fly overhead. These are worth 500 bonus points if hit.
• There are a total of three waves of aliens, each distinctly different from the last. The third is by far the most interesting. And just to make it interesting, each wave attacks *before* the previous wave is destroyed.
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