Here is the collection of basic tips that appear during loading pages aboarding or outgoing a mission.
Construction
Choose the location of your radio relays wisely, as their cost increases with every relay you construct.
Power RelayFacilities provide a +10 increase to power capacity when built atop a power coil.
Radio Relays reduce the intel cost of making contact with nearby regions.
Geospace
Make sure to check back with Resistance HQ and the Black Market every month, as they will have new staff available for recruitment.
To sabotage an alien facility and set back the aliens' Avatar Project, you must first contact the region where the facility was built.
XCOM can gain intel by scanning at Resistance HQ.
Making contact and building radio relays across a continent can lead to unique and powerful bonuses.
Making contact with multiple regions is the key to gaining a steady income of supplies.
The Avatar project can be temporarily delayed, but it cannot be stopped. You are in a race against time.
Research and Resources
Elerium cores are valuable loot items, as they are required to create any specialized ammunition, grenades or armors in the Proving Ground facility.
Every month new scientists, engineers and veteran soldiers are available for recruitment at Resistance HQ.
Experimental projects in the Proving Grounds facility can be done multiple times, granting a different but equally powerful result each time they are undertaken.
Research alien and ADVENT datapads for significant intel gains.
Alien autopsies can lead to powerful upgrades for your soldiers.
Combat
Always attempt to flank enemies before attacking them, they will be easier to hit and score critical hits against.
Ambush enemies by placing multiple XCOM units in overwatch before breaking concealment.
An increased Dodge stat can lead to "graze" shots, where only partial damage is applied.
Any timed loot on the map is recovered if you complete the mission before the timer expires.
As a soldier's position approaches a flanking angle on an enemy target, they can benefit from a "Good Angle" bonus to their hit percentage.
Enemies with a "target" icon on their HP bars are visible from the Movement cursor's current location; useful when previewing your soldiers' moves.
Enemy bodies are only collected as loot if XCOM does not "evac" from the area.
Hacking ADVENT towers with your Specialist soldiers can provide powerful tactical bonuses, but be careful; failing your hack can have negative consequences.
If a wounded soldier becomes "shaken", they can recover by killing an enemy and remaining unhurt on their next combat mission.
Overwatch shots suffer no aim penalties when triggered as part of an ambush.
Overwatch will be cancelled if the overwatching unit takes damage or is suppressed.
Rangers with the Phantom ability will begin every mission in concealment, even if the squad does not.
Upon reaching the rank of sergeant, soldiers will have more extensive customization options.
Use grenades to "shred", or remove, the armor of tough enemies before the rest of your squad engages them.
When controlling a Ranger, right-click on an enemy to initiate your charging melee attack.
When evacuating a squad, the gear of any dead or incapacitated soldiers not carried from the battlefield will be lost.
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