This is a story-based stealth puzzle game: During the summer, Marie helped her friend Emma manage the store. One day, when a customer left the store, she accidentally left a red book. And behind this red book, there is a distant story and a huge conspiracy...
Players must use a special anesthetic needle to quietly sneak up on enemies and incapacitate them. Carefully maneuvering to avoid the enemies' line of sight is crucial, as any detection will alert them and jeopardize the player's progress. This stealth-focused gameplay creates a satisfying sense of tension and challenge.
The game's environments present various puzzles for players to solve in order to advance. These puzzles seem designed to complement the stealth mechanics, potentially requiring the use of the anesthetic needle or other means to overcome obstacles. Reviewers noted that solving these interconnected puzzles can unlock "multiplier effects," suggesting the puzzles have strategic depth with interrelated solutions.
In addition to the stealth mechanics, the game also incorporates puzzle-solving elements. This blend of gameplay styles helps to maintain player engagement and cater to a wider audience, appealing to those who prefer different types of challenges.
Acknowledging that some players may be more interested in the core gameplay loop than the story, the developers have included a "no plot" mode. This mode strips away the narrative elements, allowing players to focus solely on the stealth and puzzle-solving mechanics.