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The campaign structure isn't the only thing the mod changes - it's like the biggest and most delicious expansion imaginable - and you can find all the details here, as well as download links.

As the title suggests, it extends the length of the campaign, making the fight against the invaders into a gruelling conflict rather than a streamlined series of missions. XCOM's Long War mod is, to many, the definitive version of Firaxis' reboot of the alien-repelling strategy classic.
