- Project Mirror Labyrinth Library: A Roblox roguelite deck builder inspired by Library of Ruina and Slay the Spire.
- Core Loop: Enter dungeons via the TAB menu or NO ENTRY gate, build a card deck, and survive encounters.
- Progression: Use Fragments to pull for Outfits and Reflections to boost your stats and passives.
- Active Codes: Use codes like
UrbanPlagueandWelcomefor immediate resource boosts. - Maintenance: Servers typically update every Tuesday at 2:00 P.M.
Project Mirror Labyrinth Library Overview
Project Mirror Labyrinth Library is a sophisticated Roblox experience that merges the strategic depth of card-based deck builders with the unforgiving nature of roguelite dungeon crawls. Drawing heavy inspiration from the Project Moon universe—specifically Library of Ruina and Limbus Company—the game challenges players to navigate a mysterious maze where every card choice matters. Unlike traditional RPGs, your success depends on how well you adapt your deck to the threats found within the labyrinth.
Video Highlights:
- Fusion Gameplay: A look at how Library of Ruina and Limbus Company mechanics are blended.
- Combat Flow: Demonstrating the transition between exploration and card-based battles.
- Reflection System: A quick preview of the gacha-style Outfit acquisition.
The game is set shortly after the events of Angela's Bad End in Library of Ruina, providing a rich, dark atmosphere for fans of the lore while remaining accessible to new players.
Active Codes and Reward Redemption
To accelerate your progress in the Project Mirror Labyrinth Library, redeeming active codes is essential. These rewards provide the Fragments and materials needed to unlock powerful Outfits early in your journey. Most codes require you to join the official Roblox community and "Like" the experience before they can be activated in the in-game menu.
| Code | Reward | Type |
|---|---|---|
| OfficeDelay | 1,620 Fragments | High-Value Currency |
| UrbanPlague | 405 Fragments | Progression Material |
| NepoOffice | 405 Fragments | Progression Material |
| FauvistStudents | 405 Fragments | Progression Material |
| Welcome | 350 Fragments, 500 Condense, 3 Seeds of Light | Starter Bundle |
All codes in Project Mirror Labyrinth are case-sensitive. Ensure you enter them exactly as shown, including capital letters, to avoid redemption errors.
How to Redeem Codes
- Launch the game on Roblox.
- Open the Menu on the left side of the screen.
- Select the Codes icon.
- Type or paste your code into the text box.
- Press Confirm to claim your rewards.
Combat Mechanics and Card Types
Combat in the labyrinth is turn-based and revolves around playing cards from your hand to counter enemy actions. Understanding the balance between offensive and defensive cards is the difference between a successful run and a premature exit.
| Card Category | Primary Function | Strategic Use |
|---|---|---|
| Attack Cards | Deal direct damage to enemies | Prioritize when enemies are vulnerable or low on health. |
| Defense Cards | Mitigate incoming damage/Block | Essential for surviving heavy hits from elite enemies. |
| Utility Cards | Buff stats or draw more cards | Use to set up powerful combos in subsequent turns. |
| EGO Cards | High-impact special abilities | Save for boss encounters or clearing difficult waves. |
Deck Synergy
Focus on cards that complement each other. For example, some cards might deal extra damage if you have a certain amount of Block active.
Resource Management
Keep an eye on your energy or card draw limits. Overextending in one turn can leave you defenseless in the next.
Don't just pick the highest damage cards. A deck without defensive options will quickly fall to the attrition of longer dungeon floors.
Dungeon Entry and Exploration Guide
Starting your first run in Project Mirror Labyrinth Library can be confusing due to the atmospheric, minimalist lobby. There are two primary ways to begin your descent into the labyrinth.
The TAB Menu Route
Press the TAB key on your keyboard to open the main interface. From here, select the Play button to be teleported into the starting area of the dungeon.
The NO ENTRY Gate
If you prefer an immersive start, walk through the lobby and interact with the physical NO ENTRY gate. This serves as a manual portal into the roguelite experience.
Navigating the Maze
Once inside, use your cards to clear rooms. You will occasionally find nodes that allow you to add new cards to your deck or upgrade existing ones.
Managing Maintenance
If you find yourself unable to enter a dungeon on a Tuesday, check the clock. The game undergoes weekly maintenance around 2:00 P.M. EST.
As of the current 2026 version, Project Mirror Labyrinth is optimized for Keyboard and Mouse. Controller support is not officially listed, so plan your setup accordingly.
Reflections, Outfits, and Progression
The "Gacha" element of the game is handled through Reflections. By spending Fragments, you can pull for Outfits, which act as your character's "class" or "build," providing unique stats and passive abilities.
Progression Currencies
| Currency | Primary Source | Main Use |
|---|---|---|
| Fragments | Codes, Dungeon Runs | Pulling for Reflections, learning new skills. |
| Condense | Special Rewards, Milestones | Used in the Defragmenting process for Outfits. |
| Seeds of Light | High-level Rewards | Unlocking advanced passive abilities and upgrades. |
| Reflection Tickets | Events, Codes | Free pulls on Targeted or Standard banners. |
Targeted Reflections
Best for players looking for a specific Outfit to complete a build. Higher rates for featured items.
Standard Reflections
A general pool of all available Outfits. Good for new players looking to expand their initial roster.
Defragmentation
The upgrade system. Once you have an Outfit, use Condense and Seeds of Light to unlock its full potential.
Save your SR Guaranteed Mega Tickets for major updates or when a particularly powerful Outfit is released in the Targeted Reflection pool.
Daily Goals and Checklist
To stay competitive in the ever-shifting maze of the Project Mirror Labyrinth Library, follow this checklist to ensure your account progression remains steady.
Essential Player Goals:
- Redeem all active codes for starter Fragments
- Join the official Roblox group for code eligibility
- Complete at least one full dungeon run daily for resources
- Focus on Defragmenting your primary combat Outfit
- Check the TAB menu for weekly update notes every Tuesday
Joining the official Discord community is highly recommended for real-time update alerts and community-driven deck strategies.
Frequently Asked Questions
Q: Do I need to play Library of Ruina to understand the story?
No. While the game is heavily inspired by the lore and takes place after a specific ending, the developer states that players do not need prior knowledge to enjoy the mechanics and gameplay.
Q: How do I fix the 'No Entry' gate not working?
This usually happens during the Tuesday maintenance window (around 2:00 P.M.). If it's not maintenance time, try rejoining a fresh server to sync the game state.
Q: What is the best way to get Fragments fast?
Redeeming active codes like 'OfficeDelay' provides a massive jumpstart. Afterward, consistent dungeon runs and completing high-difficulty encounters are your primary sources.
Q: Are there spoilers for the Project Moon games?
The official description notes that the game contains no major spoilers for Library of Ruina, making it safe for fans who haven't finished the original game.