Steam app 3624790 · updated 12 Sep 2026, 22:20 UTC
You’re the sole employee at the Kharnym Isle post office, stamping, sorting, and delivering mail. But the job hides secrets, and the office itself holds mysteries you must uncover. This will be the only job you’ll ever need to work… unless you can escape.
392 hourly samples, with the daily peak drawn over them. Weekends are shaded.
4 months, June 2026 to September 2026. The highest number of people in the game at once, each month, on a time axis -- a gap in the record stays a gap.
The highest number of people in the game at once, each month. Four, because four is as far back as the source keeps anything finer than one figure a month.
31 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
31 days as the curve, each the highest figure that day. Behind it, 242 hourly samples from 14 Aug, which is as far back as the source keeps every hour. Weekends are shaded.
12 days as the curve, each the highest figure that day. Behind it, 150 hourly samples. Each dip is a night. Weekends are shaded.
Letter Lost was released on 10 Jun, 2026.
| Language | Full audio |
|---|---|
| English | ● |
A blank audio cell means full audio was not marked in the returned language list.
50 achievements in total.
30 developer announcements, Dec 2025 to Sep 2026 · times in UTC
9/7 Patch NotesFix a bug where the Historian books were disappearing on the package stationWork to accommodate more resolutionsHappy mailing!~FlatNine Games Team
Patch notes9/1 Patch NotesControlsButton navigation work in menus when using controllerWork on controller mapping for the package placement mini-gameFix an issue with camera sensitivityFix an issue with inverted controls not remaining through…
Patch notesHello, citizens of Kharnym!Good news! You can now bring the dulcet tones of the post office into your day to day life, and be lulled into a postal trance at the click of a button. You can even hear three of Kharnym's favorite radio…
The JoojGreetings, Postal Warriors!We're excited to announce that Letter Lost is now on sale for the first time since launch, coinciding with our participation in the Weird Days Job Simulator Showcase! Of course, we have no idea why we're in this…
The Jooj8/24 Steam Deck HotfixA fix aimed at improving performance on Steam Deck and lower end computers, including addressing launch issues on Steam Deck. NOTE: We recommend restarting your Steam Deck after you download the update.We're continuing…
Patch notesGreetings, Postal Warriors!It's been an incredible two months at Kharnym Isle Post, and we wanted to share a few milestones and updates! We've hit 7,000 units sold, and thank goodness because the mail ain't gonna send itself. Kharnym Isle…
The Jooj7/31 HotfixSteam Deck Update: A recent Steam OS update impacted the overall performance and ability to launch the game on Steam Deck. This hotfix should should temporarily help with these launch and performance issues, though we recommend…
Patch notes7/26 HotfixFix a trophy issue with the Blythe storylineHappy Mailing!~FlatNine Games team
Patch notes7/22 Patch NotesFiller of coffee returns for moreNew dialogue for a specific ending pathNew end of week screen, for clarity and simplicityPlant progressionReduce prices on a few items in the purchase bookSkeleton key has an additional…
Patch notesPatch Notes 7/16Fix an issue where a record was reappearing every time you finished a certain desk puzzleAllow you to ask Blythe to wait one gosh darn moment as you find her packageSmall visual polish fixesPortrait fixesFix an issue where…
Patch notesStoryMake the choices for saving Barti boy more clear.Hello Sheriff, ready to play?Shelly of the Week poster!Fix a bug where Shelly won’t interact with some playersFix an issue where VO was not triggering at the end of the gameFix an issue…
Patch notesHappy July everyone! Here's a list of notes for our bug fixes, but also some exciting content adds for you to discover! Tools and Purchasebook: The flashlight automatically turns on when you pull it outSymbiotic stamps is now baseline. You…
Patch notes6/23 Patch NotesStorylines:Don’t have Lilian’s daughter? Lie about it to Lilian? No longer ends the story, you monster!If Shelly’s belongings disappear on a reload, we put them in your inventory for safe-keeping.Give the girl shoes. She has…
Patch notesImproved controller remappingContinue ironing out final quest bugs that impact the summoning of certain thingsWrinkle fixes, continue to keep certain wrinkles out of rotation until more testing can be doneFix some typos and book…
Patch notesThank you for accepting your forever job at the Kharnym Isle Post!We've been so excited to see all the new employees here at the post office, and we want to thank you all for your diligent work and deep curiosity. We've welcomed over 3,000…
The JoojFixed an issue where you could toss your pay out with little fanfare and much sadness. Camera soft lock issue resolved.Groovy lighting now appropriately turns off when Strangers arrive.Typo and text effect fixes.Wrinkle fixes including: wet…
Patch notesRelocated a certain missing child to allow you to find again. (Note: one reason for the disappearance was that the storyline was incorrectly triggering as "completed" so we're looking into how to correct this so that you don't miss out on…
Patch notesWe are closing the Kharnym Isle sewers over the weekend. It seems that mail wrinkles involving \Bitter End\ and \wet letters\ are causing some issues with mail processing, and so we're de-activating those wrinkles until the start of next…
Patch notesPatch Notes Ensure that the ritual dagger allows for crimes without punishment.There’s no in in butter!Spelling fixesDon’t allow for debtPurchasebook protections for unwanted spendingTeenager not taking letters, tell them they have toClose…
Patch notesPatch Notes: Build 1.0.4Ensure the Stranger doesn’t lose his parcel.Fix issues where Shelly was no longer welcome in the post office.No more globes. You know what you did.Fix a bug where game quality setting reset on reload.Fix a particular…
Patch notesLETTER LOST IS OUT NOW!Come on in, postal workers, and welcome to the Kharnym Isle Post! We’re delighted to have you at the post office working with us, and we know your new forever employment will prove to be fulfilling and meaningful. If…
The JoojImportant information regarding the release date of Letter Lost! As we approach the 27th, we've made the decision to delay release of Letter Lost. We chose to delay in order to do further playtesting to make sure you don't escape before…
The JoojLetter Lost Releases May 27!You've waited patiently, you've checked the mail every day, and the end of the wait is near. The mail arrives in just one month, and we can't wait for you to jump into your forever job at the post office.How to…
The JoojThe countdown is on for launch, and so we wanted to share what we're working on each week leading up to our release! This week, we've got lots on the our plate, including collectibles, achievements, and some secrets....hm...And with that…
The JoojWe had an absolute blast this week watching you all take on the new and improved Letter Lost demo over Next Fest! Thank you all for signing up for your forever jobs, and we know Kharnym Isle is grateful for all the new postal employees that…
The JoojPostal Warriors, it's here, the official Letter Lost trailer! Are you ready to mail your days away? Good, because this is the last job you'll ever have!Letter Lost is a totally normal post office game, releasing in May 2026. And in the…
The JoojSteam Next Fest is around the corner! A shiny new Letter Lost demo will be premiered during the festival, so be sure to check it out ahead of our full release in May. You will see new characters, an updated tutorial, new secrets, updated…
The JoojAs we approach Steam Next Fest and our launch in May, we've been working on updating the demo with some new features and fixes! Check out the list below to see more details about what's to come in the fresh new demo!See you in the mail…
The JoojA bit of Letter Lost news for you today! If there’s one thing we know, it’s that the mail needs time. As a team, we’ve decided to shift our release from March 2026 to May 2026 to give us some more time to refine and polish the game before…
The JoojGreetings New Hire! Your orientation packet has finally cleared processing, which means we can officially announce that the Letter Lost demo is now available on Steam! We are so thankful to be able to make this announcement during the…
nerdershewroteEverything Steam lists as add-on content for this game, newest first. Prices are left out on purpose: the store answers this page in one currency and it is not the reader's.
| Name | Platforms | Released |
|---|---|---|
| Letter Lost Soundtrack | WindowsmacOSLinux | 25 Aug 2026 |
What Steam runs, and with what. Straight from the app configuration.
| Description | Executable | Arguments | Platform | |
|---|---|---|---|---|
| Launch | LetterLost.exe | any | ||
| Launch | LetterLost.exe | linux |
The folders Steam Cloud syncs. The root is a token Steam uses for a location on your own machine, not a path this page can know.
| Root | Folder | Files |
|---|---|---|
WinAppDataLocalLow | FlatNine/LetterLost | *.json and below |
WinAppDataLocalLow | FlatNine/LetterLost | *.json.bak and below |
It runs on public data and somebody's spare time.
https://paypal.me/KintaroPalPay[email protected]0x4d559C765AA8BFe336E36d5b76024926767eD38dTJtctWU9uetJaTBoSybd1RErW7n9duTKVG