Steam app 1256670 · updated 25 Oct 2026, 18:39 UTC
"May you find your book in this place." Combat between the guests and the librarians breaks out as if it were on a stage. Defeated guests turn into books, and the Library grows onward. And eventually, get your hands on… The one singular, perfect book.
718 hourly samples, with the daily peak drawn over them. Weekends are shaded.
79 months, May 2020 to November 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.
23 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
30 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, 567 hourly samples from 08 Oct, which is as far back as the source keeps every hour. Weekends are shaded.
7 days as the curve, each the highest figure that day. Behind it, 151 hourly samples. Each dip is a night. Weekends are shaded.
| Language | Full audio |
|---|---|
| English | |
| Japanese | |
| Simplified Chinese | |
| Korean | ● |
A blank audio cell means full audio was not marked in the returned language list.
76 achievements in total.
50 developer announcements, Dec 2020 to Nov 2021 · times in UTC
Fixed an issue where certain poses would display erroneous images when using the Key Pages of Yun, Pameli, Zulu, and Mei or their projected appearance. Fixed an issue where the body image of custom skins would sometimes be displayed in…
Patch notesFixed an issue where certain battle dialogue for various enemies was missing. When the game is launched with an abnormally small or erroneous window size, the window will automatically adjust to an intended size. 1.1.0.6a11 hotfix Fixed an…
Patch notesThe 'Library Of Ruina' artbook now supports simplified Chinese! A simplified Chinese version of the artbook has been added. You can download the artbook in English, Korean, Japanese, and simplified Chinese when you purchase the DLC.…
ProjectmDevAdded a 'refersh' button to the custom invitation tool, which reloads external resources. Fixed an issue where passive ability descriptions of certain enemies were not visible. Fixed an issue where projecting appearances of pages downloaded…
Patch notesThe custom reception creation tool has been updated. Please refer to the manual for detailed instructions on modding. You can find the manual through the links below.…
ProjectmDevLibrary Of Ruina's digital artbook is on sale. The files are provided in PDF format, and are currently available in Korean and English. After purchasing the Steam DLC for the LOR Artbook, you can access the file through the Library Of Ruina…
ProjectmDevAdjusted the number of guests and librarians in the reception of Jeong's Office to 4 each. Fixed an issue where Workshop appearance projections couldn't be used properly. Added an option to properly remove books, Key Pages, and Combat Pages…
ProjectmDevThe following lists will be improved through next Friday (9/10) update. Added support for externally compiled code (in .dll format) for advanced content such as new passive abilities Added a story dialogue edit feature Added a combat…
Project MoonThe Steam Workshop support for custom general receptions has been added with today's update. Please refer to the manual found on through links below for detailed instructions. Thank you.…
Project MoonHello. This is Project Moon. Due to an issue with the custom reception data file(s), the update that was originally planned for today has been delayed until next week. We apologize for the inconvenience. Thank you.
Project MoonIncreased the starting Light capacity for the Key Pages of Kalo, Esther, Hubert, and Gloria from 3 to 4. Fixed an issue where Light was not being displayed properly if the maximum Light capacity exceeded 11. Fixed an issue where loading a…
Patch notesWe are planning to provide a modding tool to the community which will allow anyone to make a custom General Invitation reception. You will be able to create and upload custom receptions to the Steam Workshop to share with others. Our aim is…
Project MoonFixed an issue where voiceovers were missing for certain lines of dialogue. Key Page information now displays if it can have Ranged Combat Pages in its deck. Fixed an issue where the descriptions of certain Abnormality Pages did not inform…
Patch notes1. Increased the amount of books resolved by defeating guests in Urban Plague and above. 2. Improved chances of earning Limited- and Objet D'art-grade rewards from burning books, and reduced the chances for Paperback and Hardcover rewards…
Patch notesUnfortunately, due to a request to reschedule the XBOX version, the release of Library Of Ruina has been delayed to August 12th. We apologize.
Project MoonWith the help of @白華, we have officially supported Traditional Chinese. If you find the part of the text that is not normally displayed, please report support@projmoon.com. Thanks again to @白華 for the translation.
ste1. Added a passive ability to Noah's Page: Ranged Attack Damage +1 2. Reduced the dice values of Combat Pages used by enemies in the Rats' Reception. 3. Added a fast forward feature for dialogue scenes. 4. The achievement 'A Singular…
Patch notes1. Added the ability to refight past Abnormality Battles You can access this feature from the Credenza. 2. Adjusted consistency of action order so that when a character has multiple Speed dice with the same speed value, the leftmost die…
Patch notes1. Changes You can now check the librarians' hands while selecting Abnormality pages 2. Bug Fixes Fixed an issue where the game could not progress after certain receptions. Fixed an issue where targeting information would not update after…
Patch notesIf a guest's loot table (i.e. what rewards can be earned) at low Emotion Levels contains a book that is required for story progress, at least one copy of that book is guaranteed to be resolved when the reception is completed. Fixed…
Patch notesBug Fixes The Servant of Wrath: Fixed an issue where the Servant could not defeat the Hermit Fixed an issue where Emotion points were being gained from "clash results" that actually were not clashes (Previously undocumented change applied…
Patch notes1. Bug fixes and balancing
Patch notesWe thoroughly enjoyed being able to share Angela and Roland's journey with our dear players and fans for the past twelve months. Please look forward to our future endeavors. Fixed the problem that the story image was displayed incorrectly…
Project MoonHello, this is Project Moon. Regrettably, we were forced to delay the official release of Library Of Ruina by a few months. The release is being postponed in order to comply with the process for releasing the game on the console market. As…
Project Moon1. Added 6 General Invitations 2. Made Adjustments to the Manual 3. Added a Tutorial 4. Rebalanced and Reworked certain Abnormality pages 5. Made Balance Adjustments for Combat pages Flashing Strike: Speed requirement lowered from 7 to 6…
Project Moon1. Bug Fixes 1) The Black Silence - Phase 3 Fixed an issue where the Black Silence would move dice to allies regardless of input from the player The effect of the Block die on the Combat page 'Vigilant Stand' has been adjusted to activate…
Patch notesFixed an issue where Patron Librarians appeared to face unnatural directions when equipping Key pages or using E.G.O pages. Fixed an issue where the Abnormality page 'Peace' did not inflict the status ailment properly. Fixed an issue where…
Patch notesFixed an issue where the game could not progress during mid-combat dialogue segments. Fixed an issue where certain images were not being displayed properly. Adjusted the warning displayed when starting up the game and clicking on the…
Patch notesHello, this is Project Moon. The official release of Library of Ruina has been confirmed and is set to arrive on May 28th. The following features and content are planned to be developed and implemented in the full release: More General…
Project MoonFixed Bugs related to the final episode for the Floor of General Works Fixed an issue where using an E.G.O page would not transform the librarian accordingly. Fixed an issue where certain screen filters lingered in the first phase. Fixed an…
Project MoonFixed an issue where the game would softlock after completing the second reception of the Reverberation Ensemble. Added the names of patrons who were previously missing from the credits.
Patch notesThe realization for the Floor of General Works (Keter) is planned to be updated on April 30th. Thank you.
Project MoonAdjustments for the presentation and timing of the ending
Project MoonFixed an issue where receptions did not function properly after going through the new main story episode. Fixed an issue where certain visual and audio effects would persist if the battle was stopped during the new reception. Fixed an issue…
Project MoonHot Fix Fixed an issue where the effects of certain special Combat pages in the third phase of the new episode's battle were being displayed abnormally. Adjusted the usage pattern of Combat pages related to the gimmick in the third phase of…
Project Moon1. Added 3 new Combat pages 2. Balance Adjustments Changed the following passive abilities: - Resonance, Contract Changed the abilites of the following Combat pages: - Allegro, Largo, Tempestuous Danza Changed the propoerties of the…
Project MoonHello, this is Project Moon. The content update that was planned to be released on April 2 has been postponed by a week, and will be released on April 9. Also, we'd like to share the schedule for the upcoming updates from this point onward…
Project Moon1. Re-added Page Binding Mechanic for the Reception of Unwelcome Guests After completing a floor's part of the reception of the unwelcome guests, the Key pages and Combat pages used for the battle will be bound to that floor, restricting…
Project MoonDelete the system from which the core, combat page used is bound to the floor Modified so that E.G.O pages are not copied in religious battle. Changed so that all doll string are removed when the main character dies in the social science…
Project Moon1. Added 2 new General Receptions 2. Balance Adjustments 2.1) Passive Abilities The passive ability 'Electric Shock' now only activates once per target per Scene. 2.2) Combat pages Ranga Workshop: - Removed Light restoration - Now has a new…
Project Moon1. Added 1 new General Reception 2. Presentation Improvements Added story-related presentation for 2 episodes in the Star of the City chapter. 3. Balance Adjustments Increased the Cost of the passive ability 'Solidarity' from 4 to 5.…
Project Moon※ The next update to the main story is planned to be released on February 26. Fixed an issue where using the E.G.O page 'Sound of a Star' would cause the game to be unable to progress. Fixed an issue where the Combat page 'Distorted Blade'…
Project MoonFixed an issue where pages that target allies did not work properly. Fixed bugs related to the Final Episode for the Floor of Religion: An issue where Assignments listed incorrect condition. An issue where screen effect dialogues were not…
Project Moon1. Added 1 new episode to the main story 2. Bug Fixes and Adjustments Fixed an issue where the special Combat page 'Small Beak' did not function properly. Fixed an issue where the card art for 'Small Beak' was missing. Fixed an issue where…
Project MoonFixed an issue where the effect of the Abnormality page in the floor of philosophy did not match the text Fixed bugs related to the final episode of the Floor of Philosophy: Fixed an issue where the effect of the wide area battle page with…
Project Moon1. Bug Fixes Fixed an issue where using 'Guarding Stance' did not provide the temporary Power buff. Fixed an issue where the passive ability 'Force of a Wildfire' did not inflict Burn on hit. 2. Balance Adjustments Passive ability 'Bā Xià'…
Patch notesFixed an issue where the enemy's 'Pú Láo' did not function properly. Fixed an issue where 'Reversed Scale' used by the enemy would fully recover their Stagger Resist. Fixed some text-related issues. Fixed an issue where the second die of…
Project Moon1. Added 1 new Abnormality battle 2. Added the final episode for the Floor of Social Sciences 3. Adjusted the effects of certain Abnormality pages on the Floor of Social Sciences 4. Added an episode of Chitchats 5. System Adjustments When…
Project Moon1. Added 1 new episode to the Main Story 2. Changes to the combat visuals/presentation (Improved the delay between poses during engagement.)
Project Moon1. Adjustments to the Manual (English version will come soon!) 2. Balance Adjustments Once a Counter die has been used against a Combat page, it is no longer retained to respond to other Combat pages. Capped the maxium Strength gain from…
Patch notesEverything 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 |
|---|---|---|
| Library of Ruina - ArtBook | Windows | 03 Sep 2021 |
| Library Of Ruina Soundtrack | WindowsmacOSLinux | 10 Jun 2021 |
What Steam runs, and with what. Straight from the app configuration.
| Description | Executable | Arguments | Platform | |
|---|---|---|---|---|
| Launch | LibraryOfRuina.exe | windows | ||
| LOR With Mods | LibraryOfRuina.exe | -mod | windows | |
| LOR Invitaion Editor | LibraryOfRuina.exe | -invtool | windows |
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 | Project Moon/LibraryOfRuina | *.dat and below |
It runs on public data and somebody's spare time.
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