- Developed by Two Performing Arts Experts, Summer Game Fest Women-Led Game Showcase Reveals New Release Date
- A psychological horror story of confinement in a post office where the creepiness and healing coexist… Directly recorded 8 radio channels and thousands of voice lines
FlatNine Games, an indie studio founded by a husband and wife team of performing arts professionals, will officially release the psychological horror post office simulator ‘Letter Lost’ on Steam on June 10 after about two and a half years of development.
The release date of the game was revealed at the Summer Game Fest Women-Led Games Showcase. It features a unique genre identity that combines mystery, psychological horror, job simulation, adventure, and escape room elements, and contains content that allows for approximately 10 to 15 hours of playtime per session, while players who explore all elements can enjoy over 20 hours.
An eerie yet strangely cozy post office
Letter Lost is a game that pressures the player with anxiety permeated into everyday life, rather than relying on traditional horror direction or direct threats. The feeling that something is wrong persists, but the problem does not easily surface. In particular, despite working a normal job at the post office, the player finds themselves in a situation where, for some reason, they cannot leave.
A defining feature of the game is its rich sound design. One of the developers personally recorded thousands of voice lines to incorporate into the game, and eight radio channels and various recorded music fill the background. Sounds of different moods—such as yodeling, sleep music, rain, and talk radio—combine to create a unique sensation that evokes both comfort and unease simultaneously.
The mystery hidden behind ordinary post office operations
The player becomes a post office employee on Karnim Isle, repeating the daily routine of stamping, sorting, and delivering letters. While the work appears simple on the surface, ominous clues are hidden beneath the surface that gradually come to light.
You can uncover the residents’ secrets by conversing with them, or if you wish to delve deeper, you can choose to open their letters. Of course, this is not allowed behavior, but the game naturally encourages such ‘forbidden choices.’
Supervisor Liv issues instructions via an old telephone, but whether to follow them is also left to the player’s choice. Solving puzzles and finding clues to escape serve as important gameplay elements, and these choices combine to lead to various endings.
Women-led Showcase Exclusive Release Date Announced… Performing Artist Couple’s 2.5-Year Project
FlatNine Games is an independent studio that integrates performing arts-based creative experiences into games, and maintains a core principle of keeping more than half of its members female. Currently, about 70% of the team consists of women, and this background adds a unique color to the narrative and overall direction of the works.
Reactions from the media and community have been positive. Overseas gaming media praised the game for creating a unique sense of tension through its distinctive structure that combines job simulation with psychological horror. In particular, there were many comments noting the impressive direction in which anxiety gradually seeps in during the repetitive nature of daily tasks, as well as the narrative structure that changes depending on player choices.
There has been much praise within the community regarding the game’s distinctive and stylish direction, with comments such as “the quietly oppressive atmosphere is intense” and “coziness and anxiety coexist.” In particular, word of mouth has spread since the demo stage that it is “a game that draws you in with its atmosphere alone,” and it is emerging as a highly anticipated title.
Anxiety that gradually seeps into the repetition of daily life, and a narrative created by forbidden choices. ‘Letter Lost’ is poised to deliver a quiet yet intense sense of tension to players by layering psychological horror onto the familiar framework of job simulation.
Information regarding ‘Letter Lost’
| item | detail |
|---|---|
| Developer / Publisher | FlatNine Games (70% female contributors / Founded by a performing arts couple) |
| Genre | Psychological Horror Mystery / Job Simulator / Adventure / Escape Room |
| Release platform | PC (Steam) |
| Release date | June 10, 2026 |
| Playtime | Single 10–15 hours / Perfectionist 20 hours+ |
| Art style | 3D / Cozy + Psychological Horror Blend |
| radio channel | 8 channels (Yodeling, Sleep, Rain Sounds, Talk Radio, etc.) |
| Number of endings | Multiple endings (12 or more storylines) |
| Public history | Summer Game Fest Women-Led Games Showcase 2026 |
| Development period | About 2.5 years |
| Main Keywords | Post office, confinement, psychological horror, mystery, letter, island, cozy, escape, Lovecraft |
| Official Channel | Bluesky · Discord · Instagram · TikTok · YouTube · Facebook |
| Steam Page | Shortcut |
