Lex Mortis -Adventure Indie-Corror with elements of survival and puzzles, the main feature of which is a dynamic change in the time of day. This affects the gameplay, because at night on the island there are much more all kinds of monsters and other creatures attacking the player at any opportunity. The day should be used to study the territories and solve a variety of tasks to open particularly valuable chests and previously inaccessible rooms.

The action of the same -sex regime takes place on an island called Berdwood. It is open to research from the very first minutes of the game in the game. This piece of land in the sea is fictional, territorially it is located near Northern Europe. According to official figures, 2000 people live on it, but the protagonist will not find a single one. The protagonist was born on this piece of land, and decided to return to his homeland after several decades. Upon arrival, he saw only a deserted city of meek, army bases, sawmills, mines, mountain settlements and much more.

During the storyline, the gamer will have to find out what exactly happened to the population of Berdwood during its absence, and why the rest of the world considers the island to be populated and there is no concern. The gameplay consists of collecting valuable objects, equipment and weapons to confront creatures at night. It is necessary to survive as much as it will be required to solve all secrets and evacuation from the island.