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Library Of Ruina

Library Of Ruina

"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.

Released Aug 10, 2021 Developer ProjectMoon Platforms Windows Story RichCard GameStrategyDifficultDeckbuilding
View on Steam ↗ $29.99 (US · as of 2026-07-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.

94.1%positive34,509 reviews

What reviewers agree on

Praised
Criticised
Bar length = how many of the 100 reviews raise the point On criticised points, the pale part = reviewers who still recommend the game Select a point to see the exact counts and what reviewers wrote.

Counted across 100 English reviews, sampled to match this game's 94.1% positive rating · as of 2026-05-20

Recommended · 36 found this helpful

“this has some of the worst gameplay sections I've seen in ANY card-builder game (Keter and Chesed realization are some of the worst experiences I've had in a game, like EVER) because you spend about 30 hours getting to know how the game operates for it to throw it out of the…”

— a player, Steam review · 81 hrs played
Recommended · 18 found this helpful

“I beg you to go in blind. I consider myself an avid reader, I am always looking for novels that challenge my world view, but I did not expect this game to best any novel I've read. The way project moon writes humans is truly something else, they represent the struggle, the love,…”

— a player, Steam review · 178 hrs played
Recommended · 7 found this helpful

“It's peak. just Peak One of, if not the best Project Moon game. But they're all peak. Pros Limbus company but more skill rewarding No Winrate Cons vertical difficulty spike No Winrate”

— a player, Steam review · 34 hrs played
Read more reviews ↗

Player activity

Monthly average concurrent players. Live count fetched 2026-07-11 13:28 UTC · history via SteamCharts.

4,296playing at last check
4,27924-hour peak
7,211all-time peak
0 2.5k 5k 2021 2022 2023 2024 2025 2026 2k avg · Nov 2024

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-07-25.

76achievements
26.1%median completion
3.8%rarest: The One Perfect Book
94.0% of players 86.9% of players 84.3% of players 80.6% of players 79.6% of players 76.5% of players 76.1% of players 71.1% of players 64.6% of players 57.0% of players 56.0% of players 55.5% of players 54.9% of players 54.6% of players 51.6% of players 48.4% of players 46.6% of players 41.6% of players 39.6% of players 39.0% of players 38.4% of players 37.6% of players 35.5% of players 35.3% of players 34.6% of players 34.1% of players 32.1% of players 31.6% of players 31.0% of players 30.7% of players 30.4% of players 30.1% of players 28.5% of players 26.8% of players 26.8% of players 26.8% of players 26.2% of players 26.1% of players 26.1% of players 25.9% of players 22.7% of players 22.1% of players 21.7% of players 20.3% of players 20.1% of players 19.8% of players 18.5% of players 18.2% of players 17.1% of players 16.5% of players 16.5% of players 14.4% of players 13.5% of players 13.5% of players 13.4% of players 13.0% of players 12.8% of players 12.7% of players 11.6% of players 11.1% of players 94.0% 0% most earned rarest
Almost everyone has
94.0%The Road — Hidden achievement
86.9%Two Shakes of a Rat’s Tail — Complete your first reception. You’ve made your baby steps!
84.3%Extraction of Secret Worlds — Burn a book for the first time.
Rarest badges of honor
3.8%The One Perfect Book — Obtain all other achievements.
5.5%Rake in the Sheets — Use 4 pages generated by the Abnormality page 'Rake' during a single reception on the Floor of Social Sciences.
6.0%“You know my dream, right?” — Hidden achievement

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.

$29.99current · sampled 2026-07-26 08:39 UTC
$29.99lowest since tracking began2026-07-11
US29.99 USD
EU24.99 EUR
UK23.79 GBP
Australia42.95 AUD
Canada33.99 CAD
Japan3,090 JPY
Brazil57.99 BRL
China160.00 CNY

Regional prices at last sample, in local currency — Steam sets each region's price independently.

Brazil≈$11 Japan China Canada EU US Australia UK≈$32

Cheapest → most expensive, converted to USD at ECB reference rates (2026-07-24). Relative comparison only.

$0 $25 $50 07-11 07-13 07-16 07-19 07-22 07-26

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Nov 18, 2021
Patch Note ver 1.1.0.6a12

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 sk

Oct 29, 2021
Patch Note ver 1.1.0.6a10

Fixed 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 in

Sep 17, 2021
The 'Library Of Ruina' artbook now supports simplified Chinese!

The '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 Ch

Sep 11, 2021
Patch Note Ver 1.1.0.6a3

Added 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 pr

Sep 10, 2021
Patch Note 1.1.0.6 - Notice of Update to the Custom Reception Creation Tool

The 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. https://docs.google.com/presentat

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Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-20.

GenresIndie, RPG, Strategy
Player tagsStory Rich · Card Game · Strategy · Difficult · Deckbuilding · Turn-Based Combat · Great Soundtrack · Singleplayer · Psychological Horror · Indie · Visual Novel · Gore (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Steam Workshop · Partial Controller Support · Steam Cloud · Remote Play on Tablet · Family Sharing
LanguagesEnglish, Japanese, Simplified Chinese, Korean * *
Achievements76
Estimated owners1,000,000 – 2,000,000 (SteamSpy)
Official sitehttps://twitter.com/ProjMoonStudio
Minimum system requirements (PC)

Minimum: Requires a 64-bit processor and operating system OS *: Windows 7 Processor: Intel Core i5 Memory: 8 GB RAM Graphics: GeForce GTX 560+ DirectX: Version 10 Storage: 10 GB available space