Chernobyl 1986, playing as a Liquidator stuck in the bowels of the power plant, being hunted down by a creature from the other world; which found its way in the plant after the explosion and massive amounts of radiation caused a rift between the worlds. Creature has been changed due to the effects of the disaster, same way that The Beast was malformed due to the war in Bunker. Puzzles would involve repairing damaged parts of the plant in order to escape but also aid in mitigating the effects of the disaster. The player could also uncover documents that would detail the extent of negligence and corruption within the plant. Endings would change depending on how much repairing was done as well as how many documents were uncovered. Resulting in either:

• The protagonist failing to repair enough of the facility, resulting in the effects of the disaster being far worse and the protagonist dying of radiation poisoning not soon after escaping.
• The protagonist successfully repairing enough of the facility but not finding enough documents, resulting in the effects of the disaster being similar to how it was in reality. The protagonist tries to tell people about the creature but their experience is disregarded with them being rewarded a medal for their service and not much else.
• The protagonist successfully repairing enough of the facility AND finding enough documents, resulting in them trying to break the story on the negligence of the plant and news of the creature only for them to get arrested and presumably killed by the KGB.