Boris Akunin. Quest. Codes for the novel. The computer game novel

"Quest" is a new novel from the "Genres" series, in which Boris Akunin presents examples of all kinds of literature, both existing and invented by the author.
Among the latter is the "computer game novel"—a book that can be not only read but also played. This action-packed novel is structured according to the laws and logic of a computer game. The reader is offered an unusual opportunity to join the hero in unraveling one of humanity's greatest mysteries, which requires traveling to the Soviet Union of the 1930s and then being transported to an even more distant era.
"Quest" is a novel with a double meaning, or rather, two independent novels connected by coded clues.