Space Invaders

This is the original version of this game. For an easier version, go here. For the Skip Gain 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 four new Alien types:
• ShieldedAlien cannot be killed by a hit from below.
• ArmoredAlien cannot be killed by a hit on the side.
• TinyAlien flies in circles to dodge your fire. (Sort of an evil alien housefly... Sort of...)
• 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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