Atomic Heart's Polygon Testing Grounds combine many game mechanics to create a puzzling challenge. There are many Testing Grounds to discover and complete, each providing rare loot. Testing Grounds 9 requires a little more workaround, which may leave you wondering how to enter Polygon Testing Grounds 9 and complete it in Atomic Heart.
How to complete Testing Grounds 9 in Atomic Heart
Head to the location marked on the map and drop into the sewers beneath the safe house in this area. These tunnels are crawling with blooms and organic plant enemies, so be ready for a fight. Proceed through the tunnel and take the left passage when you get to it. Continue straight to progress, or take the right passage for loot.
Going through the broken wall at the end of the tunnel brings you into a room with a passage and a locked door. Open the locked door to reveal a crate of glowing orbs and a tube system. Pick up an orb and place it in the tube. Use the tube system to place an orb in each boiler, activating them. This will explode and can hurt you, so don't stand too close.
Feel free to explore the rest of the facility for loot, or you can go through the passage in the boiler room and open the other locked door. Jump into the polymer and swim out. Swim out of the tunnel and head to the tower in front of you. Hack a camera and open the Hawk control hut and Polygon Testing Grounds 9. Go in the elevator to the left of the statue to enter Testing Grounds 9.
After getting off the elevator, there will be a break room where you save on the right. The left hall leads deeper into the Testing Grounds. You will see a device that can be hit with Shok. Use the Polymetric Jet ability to connect the gel on the ground to the door. Use Shok on the gel and quickly go through the door while it is open.
Related: Atomic Heart – Polygon Testing Grounds 6 Walkthrough
Go down the hall and drop into the room below. Grab the glowing orb and place it in the red box to open the door. Crawl under and enter the room. Head to the door with the orange light to find a chest robot and open this to get the KS-23-Collimator.
Go downstairs and push the red button. This opens the door to the container underwater. Head back up, dive in, and grab the glowing orb. Bring it to the room you opened with the first orb, though be careful not to bump into anything and drop the orb. Place it in the power slot on the other side of the opened door in the room to open the door. Grab the orb you first placed outside the room. Place both orbs in the power stations on the right wall.
Place it in one of the power stations to open the door to this room. Go through this room and enter the room on the right. Press the red button to open the doors across the water. Put one of the orbs on the slot by the other to open it, then move the second orb to the slot on the other side. Be sure to save and equip a melee weapon with a flame cartridge before opening the door, as you will have to fight a Plyusch.
Defeat the Plyusch, destroy the blooms, and finish off the rest of the enemies. Go to the far side of the room and open the locked door. Go downstairs and enter the door on the right to find the next chest robot. Open it to claim the Dominator-Shot.
Related: Atomic Heart – Polygon Testing Grounds 1 Walkthrough
Proceed forward until you reach the room with more power slots and magnetic walls. Go to the left of this room and use Shok on the ceiling magnets. Use these to grab the power orb in the caged area and drop it over the side into the main room.
Alternate the orbs into the power slots on the right and left sides of the chamber. This will create platforms you can use to climb to the door at the top. Do not drop the orbs, or you will have to restart. You can charge up and throw the orbs while holding them. You must also use one of the orbs to power the door.
Go through the door to find the exit, a break room, and the final chest. Open the chest to receive the Kalash-Electromagnetic Polarize and Pashtet-Handle. Call the elevator and leave Polygon Testing Grounds 9.
For more information on Atomic Heart, check out Is there fast travel in Atomic Heart? and Can you respec in Atomic Heart? on Pro Game Guides.
Justin has been diving into fantasy worlds since he can remember. He is a certified nerd who has a deep love of reading, writing, and hiking. He has been writing since his college days, but specifically in gaming for two years. His favorite games are The Legend of Zelda, Pokémon, Hollow Knight, Celeste, and Banjo Kazooie.