Caverns: Lost Sky is a single player action-adventure RPG set in a fully destructible, voxelized subterranean realm. Join Strato in the Tellurian Sector as he battles hordes of Fera in his quest to find the sky. Level up and increase your stats, or ascend the caverns searching for buried treasure.
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Release Date:
Jan 31, 2019

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game is not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“As a small, two-man team we feel that the community's concerns and suggestions are among some of the most valuable input a game developer can receive. Early Access allows us the opportunity to use this input in prioritizing bug-fixes and determine which new features to add first.”

Approximately how long will this game be in Early Access?

“We predict Caverns: Lost Sky to remain in early access for an additional 2-3 years.”

How is the full version planned to differ from the Early Access version?

“The basic mechanics and a large number of core features are already implemented in Caverns: Lost Sky. Some of these include combat and leveling up, digging massive tunnels and caves, and crafting unique item recipes. The remaining tasks to be implemented for the first level, the Tellurian Sector, are:

  • Questing system
  • Skill upgrade menu
  • Town and neutral AI
  • Dungeons

In total we have an additional 5-6 levels/sectors planned. Each with their own town, dungeons, and enemies. The Tellurian sector is our testing ground to refine the core game loop, and receive feedback on core features. Once the community and ourselves are satisfied, development will shift to the story line, item balancing, and remaining levels.”

What is the current state of the Early Access version?

“Here are the major game features already present in the Tellurian sector:

  • Combat and enemy AI
  • Endless subterranean labyrinth
  • Digging and mining ores
  • Stats and level up mechanics
  • Crafting and inventory management

Will the game be priced differently during and after Early Access?

“At the moment Caverns: Lost Sky is incomplete and in an alpha stage of development. However, with tons of new content planned, the price is likely to rise over its life cycle. Price changes will coincide with new levels being completed.”

How are you planning on involving the Community in your development process?

“As gamers ourselves, we recognize the vital importance of community feedback in the Early Access process. Engagement with our community on Reddit, Social Media, and Official forums allows us to hear what matters most to you. This helps us locate and fix bugs, prioritize features, and above all keep development in check.

Caverns: Lost Sky runs on our lightweight, custom Numinous Engine which provides us the power and freedom to quickly adapt game mechanics in response to community feedback compared to rigid, traditional game engines.”
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Recent updates View all (5)

February 8

UPDATE: Patch 0.1.2

Hello Everyone,

We have released Patch 0.1.2, containing much requested fixes and changes to the Options screen, including Mouse Inversion, Mouse Speed, Resolution settings and Particle System settings. This update also contains several performance tweaks, which should hopefully help smooth out or eliminate input lag due to stuttering.

In addition, we fixed an issue related to the Inventory Screen which could cause the game to crash, as well as a bug which causes equipment durability to decrease incorrectly in some cases. Some equipment (eg. Armor) did not break upon reaching 0 durability. This no longer occurs, and these items can now be broken.

The changes in Update 0.1.2 include:
  • Added Mouse Y/X - Axis Inversion Setting
  • Added Mouse Y/X - Axis Speed Setting
  • Added Resolution Setting
  • Added Particle Density Setting
  • Added Particle Enable/Disable Setting
For more details, see 0.1.2 Patch Notes in the Change Log forum.

Also contained in this update are several behind-the-scenes changes to prepare for the replacement of the "application restart" game over mechanic. Progress on this feature has been smooth, and we are still on track to enable it within the next couple weeks.

We would also like to thank everyone for their feedback and suggestions - we consider our user's feedback the most important information we can receive, and together we hope to make Caverns: Lost Sky as fun, satisfying and rewarding as possible.

- Team Tetravoxel ( :
1 comments Read more

February 6

UPDATE: Patch 0.1.1

Hello Everyone,

First, we would like to welcome everyone to the Caverns: Lost Sky community, and to thank everyone for their interest in our first game! We have been slow to post in the past few days as we have been working hard to address the issues and suggestions we received following release.

The first patch, which was released on Monday, fixed a large number of release issues. These fixes include:
  • Fixed the ability to leave full screen mode
  • Fixed several lock-on targeting issues when switching weapons
  • Fixed losing your recently equipped weapon or tool on save
  • Fixed a number of issues related to Poneroid attack patterns
  • Fixed a crash when your third weapon was equipped and breaks while opening the inventory simultaneously and clicking on the (now destroyed) item
Please see: 0.1.1 Patch Notes, in the Change Log forum, for the full list.

In order to effectively communicate which fixes or features are planned in future updates, there will be a post (for each update) in the Suggestions Forum detailing what will be changed.

We have received numerous concerns about current missing features that our user greatly require, and we hear you.
Our next update will consist of an overhaul to our games settings screen, allowing the user to select critical features such as: Resolution, Mouse Inversion, Mouse Sensitivity, and a particle limit. Following this announcement there will be a post in the Suggestions Forum with more details.

Additionally, we are currently working on the permanent replacement for our temporary Game Over solution. We acknowledge that the current solution (restarting the executable) is far from ideal. This solution is a temporary patch while we resolve a critical error with the automatic-reload feature. This error had a small chance of corrupting the user's save file. Due to this issue, we made the call to have the executable restart, as a temporary stop-gap measure.

The automatic reload feature is currently our highest priority, and we expect to push an update to enable it within the next couple weeks. Rest assured that we are not spending time on anything that does not implement this feature, besides additional options to allow users to optimize their experience as is.

Once again, thank you to everyone for your interest in Caverns: Lost Sky. As our first game and our first self-published software project, we are extremely appreciative of your suggestions and feedback. Please look forward to much more frequent posts in the future.

- Team Tetravoxel ( :
0 comments Read more
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About This Game

⠀⠀⠀⠀"For thousands of cycles, remnants of humanity have dwelt peacefully within the subterranean village of Telluria. A young spelunker's world is turned upside down when a routine mining expedition is ambushed by a crazed horde of Fera, leaving him the only survivor."

Join Strato in an action-packed adventure RPG through the voxel wilderness of the Tellurian Sector, and uncover the truth about his world! Explore winding labyrinths and colossal caverns powered by our in-house Numinous Engine. Engage large groups of enemies with a real-time combat system, where weapons have their own personality. Level up and find rare treasure to aid in your journey, or follow legendary recipes and fight with the tools of your ancestors.


Dive into the Tellurian wilderness with Strato and check out a variety of different mechanics, all the while avoiding hazards and battling Fera. Current major features include:

Current Features

  • Explore - Trek through an endless cavernous system with unique geographical land marks
  • Combat - Battle hordes of enemies, each with their own personality and fighting tactics
  • Loot - Plunder buried treasure for more than 80 equippable items, including 7 armor sets
  • Tools - Select from a range of tools including mining picks, grapples, torches, and beacons
  • Harvest - Mine and collect several types of ores, or harvest plants for recipe ingredients
  • Craft - Discover over 100 unlockable crafting recipes with multiple rarity types and qualities

Upcoming Features

  • Dungeons - Conquer mystic dungeons with layouts that change upon each visit
  • Quests - Complete quests to progress the story-line, or spend time on side quests
  • Towns - One population center with NPCs and stores to interact with, per sector
  • Skill Upgrades - Spend skill points, powering up and unlocking particle-based skills
  • Cut-Scenes - In-Game cinematic sequences accompanying quest progression


Caverns: Lost Sky runs on our custom-built Numinous Engine. Early access allows us to refine not only the game, but the core engine too. Here are some of its advanced capabilities:

  • Tetravoxelization - Produces angled terrain shapes making it easy to walk and run over
  • Membronic Linkaging - Creates endless, organic-looking tunnels and cavernous systems
  • VoxelScript - Custom-built scripting language used to easily define enemy AI behaviors
  • In-Game Debugging - Press F keys to visualize hit boxes, toggle free camera, and more
  • Volumetric Particles - Define particle systems for resources, enemies, items, and skills
  • Destructible Terrain - Fast terrain modification in real time

System Requirements

    • OS: Windows 8 (64 bit only), Windows 10 (64 bit only)
    • Processor: Intel i5 @ 3.0 GHz or higher (or AMD equivalent)
    • Memory: 8 GB RAM
    • Graphics: Geforce GTX 1060 / Radeon RX 570 or higher
    • DirectX: Version 11
    • Storage: 2 GB available space
    • Sound Card: DirectX® compatible on-board
    • Additional Notes: No internet connection needed.
    • OS: Windows 10 (64 bit only)
    • Processor: Intel i7 @ 3.3 GHz or higher (or AMD equivalent)
    • Memory: 16 GB RAM
    • Graphics: Geforce GTX 1080 Ti / Radeon RX Vega 56 or higher
    • DirectX: Version 11
    • Storage: 8 GB available space
    • Sound Card: DirectX® compatible on-board
    • Additional Notes: No internet connection needed.

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