Title screen
Background story part 1
Background story part 2
Credits screen with effect
Game part 1: if advises you that this is Bert
Simply try to point the cross-hair to the helicopter
If you shot the helicopter above Bert and it is hitting him on crashing, the game ends
The revenge of Bert: defend by planting bombs wisely to prevent the lasers reaching Earth
If the attackers reach Earth, energy is lost
It is not "Game Over", but "Bert Over"...
The high-score table
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