The story of the game revolves around Professor Igor, who is on a quest to find his wife, Tatyana. His journey is focused on the search for a mysterious substance called chernobylite, located in the Chernobyl region.

The gameplay features a Geiger counter that serves a dual purpose: detecting radiation and highlighting collectible items. As players navigate through the game, they engage in daily missions, selecting areas for Igor and his team to explore. While teammates gather resources, Igor has the opportunity to investigate key points of interest and interact with various non-player characters.

The game's combat system initially emphasizes stealth but gradually shifts towards more action-oriented gameplay as players acquire an arsenal of weapons, including the AK47 and an upgraded shotgun, primarily used against zombie-like enemies. The stealth mechanics are somewhat limited, though, as it's with challenges in enemy detection and visual identification.
Weapon customization is a standout feature, offering a range of upgrades, each with its own advantages and visual indicators. Another innovative aspect is the skill acquisition process, where players complete mini-missions to learn new abilities, such as a silent takedown requiring the player to sneak up on a trainer.

Throughout the game, players encounter decision-making scenarios with deliberately ambiguous outcomes, adding depth to the gameplay. One significant choice involves the fate of the infamous Chernobyl radar, with no clear indication of which option is preferable until much later.

A pivotal moment occurs on the tenth day when, regardless of the player's actions, they face death and enter a realm called the Fractal Memory. This area allows players to revisit and alter their previous decisions, a mechanic reminiscent of the Zero Escape series on the 3DS.

Later on it's revealed that Tatyana was taken by the KGB for her anticommunist stance, and the plot thickens with the involvement of a child born under unique circumstances, and the transformation of a character named Boris into the Black Stalker, the game's antagonist.
The game also includes a variety of references and nods to other works, such as a device named Ariadne that detects an object’s history through radiation, and a character who references the Rat King and leaves a ballerina music box, an allusion to the Nutcracker ballet, maybe?

Achieving the best ending in the game is challenging, requiring specific and non-obvious choices.
The game concludes with a surprising twist: the Black Stalker is revealed to be Igor himself, and the player is actually playing as Igor's son, who has been implanted with Igor's memories. This revelation ties the story together in a compelling manner.

Overall, the game offers a unique experience with its combination of survival, exploration, and storytelling elements. While it may not appeal to all gamers, especially due to its challenging crafting system, setting it to an easier mode can enhance enjoyment. The game stands out as a unique find, offering more enjoyment than initially expected.