Letter Lost

A horror puzzle adventure inside a post office you cannot leave

FlatNine Games · Released Jun 10, 2026

Reviews: Very Positive; 80% of 162
Recent reviews: Not enough recent
Players: 10; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 1 day ago; Oct 27, 2026
Minimum PC: GeForce GTX 1060; 8 GB RAM · 11 GB disk; Full requirements

What is Letter Lost?

This single-player horror adventure puts you in charge of Wistvale's island post office, where leaving is forbidden. You stamp, sort, and deliver mail during daily shifts, handle customers, solve puzzles, and buy workspace upgrades with your wages.

For you if...

+you enjoy sorting and organizing under time pressure
+you like story-driven mysteries with cosmic horror themes

Not for you if...

−you want a mystery without routine sorting and stamping
−you want a multiplayer adventure rather than solo play

What players say

80% of 162 reviews are positive

Players praise the strange story, puzzles, and voice acting. Earlier complaints focus on crashes and progression-blocking bugs; later reviews note fixes, though technical problems still draw criticism.

Screenshots and trailer

Letter Lost system requirements

Minimum: GeForce GTX 1060, 8 GB RAM, 11 GB of disk space.

As published by the developer.

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Minimum

OS: Windows 10/11, 64-bits
Processor: Intel Core i5-7100/Ryzen 3 1200
Graphics: NVIDIA GeForce GTX 1060/AMD RX580
Memory: 8 GB RAM
Storage: 11 GB available space
DirectX: Version 11

Does Letter Lost have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does Letter Lost run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

Default controller config not fully functional
Sometimes shows mouse, keyboard or non-Deck controller icons
Some in-game text is small and may be hard to read
Default graphics settings perform well on Steam Deck

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows, Linux
Achievements: 51
Steam features: Cloud saves, Family Sharing
Languages: Full audio: English.

Does Letter Lost use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam