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Library of Ruina — a deck-building RPG by Project Moon on Steam
Library of Ruina is a dark deck-building role-playing game by Korean studio Project Moon and a direct sequel to Lobotomy Corporation. You run a mysterious Library that exists beyond the ordinary City: you invite guests, fight them in turn-based "Reception" duels and, by winning, claim their Books. Each Book is a new deck, new cards and new enemies you can summon. Step by step you draw closer to the single truth the Library was built to find. Here you buy the game as a Steam gift: once your order is placed, it arrives straight in your Steam library.
What you get
This is the base, complete version of Library of Ruina with all story chapters and the post-launch updates the studio shipped. It's a single-player, finished game — there are no required DLC, battle passes or in-game purchases to buy separately. You get all the content at once: dozens of Library floors, hundreds of cards, bosses and a long campaign that runs for many dozens of hours.
What the game is about
The gameplay revolves around building decks and managing each character's "speed dice" every round. You can see in advance who is targeting whom and decide which card to clash with an enemy attack, who to expose and who to keep safe. It's a slow but very demanding kind of tactics: one mistake in your speed setup can unravel the whole turn. On top of the mechanics sits Project Moon's signature storytelling — heavy, philosophical, with vivid characters set against a brutal City. If you enjoy dark tactical games and narrative deck-builders, this one will keep you busy for a long time.
How we deliver it
Library of Ruina is delivered as a Steam Gift via a bot. You provide your Steam friend invite link and your account region. The bot then adds itself to your friends, sends the gift and automatically leaves once delivered — you don't need to accept anything manually. Steam Guard is not required to receive the gift. Delivery usually takes a couple of minutes from the moment your order is placed.
Region and key conditions
The main condition for a successful delivery: your Steam account region must match the gift region, and you must not already own the game — Steam won't let you accept a gift for a title that's already in your library. Your privacy settings must also allow friend requests. If the bot couldn't add you, it's usually because friend requests are blocked or the invite link is outdated — update your privacy settings and send a fresh invite link.
If you like Project Moon
Library of Ruina sits at the heart of the Project Moon universe. Before it came Lobotomy Corporation, a management horror about containing anomalies whose events echo directly through the Library. After it came Limbus Company, continuing the same story in a new format. And if it's the card tactics and deck-building you're after, check out the other deck-building RPGs in our catalog.
Difficulty and who it's for
Library of Ruina is genuinely hard, and that's the point rather than a flaw. The game doesn't punish reflexes or finger speed — it rewards planning. Before each round you see the full picture: which cards the enemy will play, who they're targeting and how many speed dice they have. Victory comes through clashes: you pit your card against an enemy's, and whoever rolls higher breaks the opponent's attack. Once you internalize that rhythm, you start building decks for specific bosses, leaning into elements and status effects (bleed, burn, tremor and more) and chaining whole combos. It's a game for players who love mechanics that are deep and reward careful thought.
Story and atmosphere
The story is told through dialogue, the guests' journals and the Books you reclaim. The City is harsh, sharply class-divided and at times genuinely cruel, and it's against that backdrop that the Library characters' motives unfold. Project Moon is known for not shying away from heavy themes and morally grey characters, and Library of Ruina is one of their most cohesive narratives. Playing Lobotomy Corporation first isn't required, but it adds a lot of context and emotional payoff.
Platform and ownership
This is the Steam (Windows) version. Once you receive the gift, the game lands in your Steam library like a normal purchase — you can install, update and launch it without restrictions, and it stays yours forever. It also runs great on Steam Deck, so you can play Library of Ruina at your desk or on the go.
Quick questions
Do you need internet? Only for downloading and updates — the game itself is single-player and works offline. Is there localization? The game supports several interface languages and the community actively translates it; check the current language list on the Steam store page. How long is it? The main campaign runs many dozens of hours, and with deck experiments and tough bosses it easily passes a hundred. This is a full, large game in a single purchase.