When a new game is started, four difficulties can be chosen: Easy, Normal, Hard, and Impossible. Difficulty cannot be changed once the game has started.

In addition to affecting hard numbers such as damage rate or research speed, difficulty also affect diplomatic proposals. Easy difficulty will see more generous offers and gifts. In Hard and Impossible not only do the gifts disappears, you may actually be demanded to hand out territories.

Despite the name, with good tactic and strategy (and perhaps some help from this wiki), Impossible difficulty is not impossible to win for a veteran of the game.

Afterlight's Design Document (in Czech) may contains detailed difficulty formula.

Strategic GameEdit

Easy Normal Hard Impossible
Research Speed 1.5 1.0 0.8 0.6
(ResearchTimeMod) Research speed multiplier.
Production Speed 1.5 1.0 0.9 0.75
(ManufacturingTimeMod) Production speed multiplier.
Training Speed 1.2 1.0 0.9 0.5
(TrainingSpeed) Training speed multiplier.
Training Decay 0.3 0.4 0.5 0.6
(TrainingDecay) Decay speed of partial Training.
Level Up Speed 1.4 1.0 0.85 0.75
(ExperienceMod) Experience multiplier. (Also apply to strategic)
Healing Speed 0.07 0.05 0.04 0.03
(HealingNormal) Healing speed when not in ward or surgery.
Faction Spreading 9 10 11 12
(FactionSpreading) Speed of alien faction expansion.
Raid Destroy 0.6 0.5 0.4 0.3
(RaidDestroy) Chance that Rocket Base destroys intruders.
Environment Hostility -7.2 -6.9 -6.6 -6.3
(HostilityBonus) Environment hostility level adjustment.

Tactical GameEdit

Easy Normal Hard Impossible
Enemy Count 2.2 2.5 2.8 3.0
(AverageSquadsCount) Average number of enemy squad.
Enemy Attribute 2 6 8 10
(EUdefaultLevelUpPoints) Enemy attribute budget baseline.
Environment Damage 1/10 1/5 1/3 1/2.4
(HostilitySuitBase) Environment damage caused by suit breach.
Enemy Sight 0.9 1 1 1.15
(EnemySeeingMod) Enemy sensory range multiplier.
Player Sight 1.15 1 1 0.9
(EnemySeeingMod) Player character sensory range multiplier.
Enemy Damage 0.5 1.0 1.05 1.15
(DmgModFromEnemy) Enemy damage multiplier.
Player Damage 1.5 1.0 0.85 0.5
(DmgModToEnemy) Player character damage multiplier
Friendly Fire 0.05 0.5 0.75 1.0
(FriendlyFireWeight) Friendly fire weight adjustment.

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