Page "X-COM: Apocalypse" Paragraph 7
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The game features self-adjusting difficulty, where player performances influences the Alien zeal to expand and infest.
Sluggish X-COM responses, total failures, and a bad weekly rating slow the alien build-up of weapons and creatures ( but not ships ) on their homeworld.
For example, a high rating in first five days can make the Aliens attack your HQ head-on with a large heavily armed mob often.
Conversely, a low rating in the first five days can make the aliens only incur twice a week, with a very small force.
This also affects the equipment quality of the aliens, so if a very high score is acquired quickly ( for example by using a bug that allows the player to raid allied organisations without hostile response ), the very first batch of aliens might be found with personal shields and disruptor cannons ( which normally would appear only much later in the game ).
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