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Differences
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| The splash screen says copyright 1983 |
| The game has no title screen and starts by itself |
| You have infinite lives |
| There is no score display |
| There are no smart bombs |
| There are no humans on the planet surface |
| After you die the enemies are not reset. Therefore enemies
will swarm you and you die over and over again. |
| Each wave consists of entirely one type of enemy (last wave
is all humans!) |
| After completing a wave the planet will blow up
and the next wave will be in space. After completing the space
stage the planet surface will reappear. |
| There is a message box under the scanner that says
random things |
| The planet explosion effect is completely different |
| The warp effect is completely different |
| Your ship does not appear far enough form the stargate after
exiting, so it is easy to get caught in a gate over and over again. |