Title screen
Continue with one or two players.
Starting scores for each enemy type
Start of the game with a full planet surface.
Some parts of the planet have been bombed already.
Moving far to the left to catch the invaders early on.
A colour change as a part of the planet has been hit successfully.
Temporary ceasefire: the game will continue with a higher score for each defeated enemy.
The planet is almost entirely destroyed.
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