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Watch trailer on Steam ↗UNDERDEEP
UNDERDEEP · Published by Hakony
Last updated 28 Sept 2026
UNDERDEEP is an idle RPG that lets you dive deep into dungeon exploration and mapping, set in a gritty, immersive fantasy world. Blending the charm of classic RPGs with modern idle mechanics, it offers a rich and thoughtful gameplay experience.
Adventure, Indie, RPG, Simulation, Strategy · 2026 · More free games
Dive into UNDERDEEP's adventure as you explore and map dungeons in a richly detailed fantasy setting. Developed by UNDERDEEP, this unique idle RPG combines modern gameplay with the nostalgic appeal of classic RPGs.
About this game
UNDERDEEP is an idle RPG that lets you dive deep into dungeon exploration and mapping, set in a gritty, immersive fantasy world. Blending the charm of classic RPGs with modern idle mechanics, it offers a rich and thoughtful gameplay experience.
Character Creation
Your journey begins by creating your own character. Name them, select a visual style, and enter a world of adventure with the one who represents you.
Job System
You’ll begin as a Newbie, a complete beginner. But as you gain experience, you can evolve into a wide range of roles—warrior, rogue, ruler, or crafter. Experience a highly flexible job system where your growth determines the path you take.
Mapping
At the heart of dungeon exploration lies mapping. Locations are automatically recorded as you explore, and you can place your own custom markers to keep track of important spots. Your observation and note-taking skills are the key to successful expeditions.
Over 500 Unique Items
Weapons, armor, accessories, and more await deep within the dungeon. Use your gear strategically to challenge increasingly dangerous and rewarding areas.
Skill Customization
Build your own strategy with unique skill combinations. Some skills can synergize dramatically, amplifying your power. Craft your ultimate build and conquer the depths your way.
Idle-Friendly Exploration
Whether you prefer hands-on control or automation, you can choose between manual or auto actions during exploration. Set your strategy beforehand, and your character will continue adventuring even while you're away. Perfect for busy players who want to keep progressing.
Light Asynchronous Multiplayer
You might encounter characters created by other players inside the dungeon. Customize your “dialogue” and “behavior” settings to prepare for these spontaneous meetings. Enjoy a relaxed, asynchronous multiplayer experience that lets you connect without pressure.
Karma System
Your behavior in the dungeon affects your character’s karma. Will you walk the path of light—or descend into darkness? The choice is yours.
------ Prologue ------
In the deep forest near the royal capital, a mysterious dungeon infested with monsters opened its maw. The first to venture inside was a nameless man. He returned drenched in blood, clutching an armful of gold. Word spread like wildfire, stirring the hearts of all who sought fame and fortune. Sword-bearing mercenaries, knights in pursuit of glory, and reckless adventurers made their way into the forest one after another. It was said that deep within the dungeon lay a treasure powerful enough to shake even the throne itself. ―And now, you too stand at its entrance. Will you seize your destiny, or be swallowed by the darkness? Your story begins here.
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows10
- Processor: Intel(R) Core(TM) i3
- Memory: 4 GB RAM
- Network: Broadband Internet connection
- Storage: 2 GB available space
Recommended
- Requires a 64-bit processor and operating system
- OS: Windows10
- Processor: Intel(R) Core(TM) i5
- Memory: 4 GB RAM
- Network: Broadband Internet connection
- Storage: 2 GB available space
Supported Languages
Latest news
AnnouncementsOfficial
New Gameplay Video Now Available
Thank you for your continued support. We’ve released a new gameplay video for the game we’re currently developing. This video features gameplay from the early part of the game. We hope it gives you a better sense of the game’s atmosphere and what it actually feels like to play—something that can be difficult to fully convey through text and images alone. Watch the video here: We’ll continue working hard on development to create a game you’ll truly enjoy. Thank you again for your support!Read full article on Community Announcements (UNDERDEEP)Patch NotesOfficial
Development Update: New Features in the Works
This post introduces features that are currently in development for UNDERDEEP.Behavior Policy SettingsYou can set a character’s behavior policy for each tile (coordinate) on the map. During auto-play, characters will prioritize actions that follow the policies assigned to the tile they’re on.Examples of available policies:A: Go NorthC: Go WestE: Use PotionF: Do EvilG: Do goodYou can assign up to two policies per tile.One of the fun parts of the game is experimenting with different setups—routes focused on uncovering unexplored tiles, routes that prioritize efficient character growth, or high-risk treasure-hunting routes that ignore danger.Read full article on Community Announcements (UNDERDEEP)AnnouncementsOfficial
UNDERDEEP Crowdfunding Is Now Live!
Thank you, as always, for your continued support. We’re excited to announce that the UNDERDEEP crowdfunding campaign is now live! Kickstarter (Worldwide) CAMPFIRE (Japan) We’ve put together a range of reward tiers—from early access so you can play early, to customization-focused tiers that let you dive deeper into the world of UNDERDEEP. Whether you want to support the game or simply enjoy UNDERDEEP in a more creative way, we think you’ll find a tier you’ll love. It would also mean a lot if you could help spread the word—sharing the campaign on social media or telling friends makes a huge difference. We’ll keep working hard to make UNDERDEEP the best it can be. Thank you again, and we hope you’ll continue supporting UNDERDEEP!Read full article on Community Announcements (UNDERDEEP)AnnouncementsOfficial
Crowdfunding Page Preview Now Live
Thanks for your continued support!We’ve posted a preview of UNDERDEEP’s crowdfunding page.Kickstarter (Worldwide)CAMPFIRE (Japan)The page includes reward details and a message from the developer—please take a look.On the crowdfunding page, click “Notify me on launch” to get an email when the campaign goes live.Thank you!Read full article on Community Announcements (UNDERDEEP)Patch NotesOfficial
Release Schedule Update and Crowdfunding Plan
Thank you as always for your support. I’d like to share the current development status and plans moving forward.Current Development StatusThis project is currently in the middle of core system development, and overall progress is about 30%.I initially aimed to release in Q1 2026, but as development has progressed, I’ve gained a clearer understanding of the work still required. I’ve realized that sticking to a Q1 release would mean cramming too much into too little time, which could result in a product missing key elements of the intended experience.To avoid this, I’ve decided to revise the schedule to ensure the game includes everything it needs for a solid player experience.About the Crowdfunding CampaignUp until now, I haven’t had enough time to fully dedicate myself to development. To help secure that time and improve the overall quality of the game, I’m planning to launch a crowdfunding campaign.If the campaign reaches its goal, it will allow me to improve the game’s quality and accelerate development.※Even if the goal isn’t met, I will continue development and aim to release within 2026.Thanks to everyone’s support, the game has surpassed 4,000 wishlists on Steam in just the first month since the page went live.I’m deeply grateful for the growing excitement. I’m sorry to ask for a bit more time, but I hope you’ll understand—this is so I can deliver something truly worth your support.More Info Coming SoonDetails about the crowdfunding campaign, including the timeline and details, will be shared once everything is ready.Read full article on Community Announcements (UNDERDEEP)
