Atomic Heart endings, explained

gamepur.com:

Atomic Heart has a lengthy story that packs in a lot of information in a very small space of time. It’s absolutely understandable if the ending confuses you slightly, which is why we’ve put this guide together to explain both of the conclusions you can reach.

If you choose to take down Sechenov, you’ll get to see the best ending in Atomic Heart. You’ll first have to fight your way through The Twins. Then, when P-3 confronts Sechenov, his glove electrocutes him, causing him to fall to the floor. The glove pops open, and the Neuropolymer containing the personality and brainpower of the character you know as Charles crawls out. He speaks about how he has been manipulating P-3 from the very beginning to distrust Sechenov, and now that both Sechenov and P-3 are incapacitated, Charles makes its move. The Neuropolymer crawls across the floor, all the while chatting about how humans need to become extinct and make way for the new dominant lifeform, Polymer, into the nearby vat of Red Polymer.

If you’ve been paying attention, you’ll remember that Red Polymer can absorb bodies and create new lifeforms. Charles uses it to take the rough form of a jelly man before picking up Sechenov and breaking his neck. Later we learn that Charles also absorbed the body, but we don’t know if it does the same to P-3. Charles explains that Polymer is so much more than humans could ever be, and now it needs to spread around the world and become something else alongside the robots it helps support.

Charles picks up the Thought Device on Sechenov’s desk and crushes it. This seems to do something more, but we’re not sure what. It may just be a signal that all Thought Devices have now stopped working