One of the challenges in Fortnite Chapter 2 Season 7 Week 12 is to collect three alien devices and then activate the countermeasure device below Corny Complex. To do this, you’ll need to know exactly what you are looking for, as it is not that obvious.

For the three devices, they are all reasonably close together on the map. You will need to find small purple spheres that are floating in the alien biomes areas. They can be hard to spot, so check the individual screenshots showing each one, or check the embedded video above.

Alien Device #1

Alien Device #2

Alien Device #3

Once you have all three, you need to head underground to the Corny Complex IO bunker. Take out all the guards and Slone, then check the side room to find the countermeasure device. You just need to interact with it to activate it.

You can find the rest of the weekly challenges below:

Week 12 Legendary Challenges

  • Get Slone’s orders from a payphone – 15000 XPCraft a weapon with Alien Nanites – 45000 XPDestroy target dummies with IO weapons – 30000 XPSearch for books on explosions – 30000 XPDeploy scanners in the alien biome – 30000 XPCollect three alien devices, then activate the countermeasure device underneath Corny Complex – 30000 XP

Week 12 Epic Challenges

  • Deal damage to saucers – 30000 XPDeliver a Saucer to Rick Sanchez at Defiant Dish – 30000 XPDeal damage to opponents with alien weapons (0/150) – 30000 XPDeal damage with an Alien Parasite attached – 30000 XPPurchase from vending machines – 30000 XPSearch ammo boxes at Dirty Docks – 30000 XPHunt Wildlife – 30000 XP