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 (9)

March 7

UPDATE: Patch 0.1.7

Update 0.1.7: Visual Combat Indicators

Hello Everyone!

With the latest update, we have introduced visual combat indicators! Now you can see how powerful your new sword is, how much experience an enemy has dropped, how much a potion heals you, and more! Most actions in Caverns: Lost Sky are now accompanied by a visual display, an example of which is shown above. We also fixed a critical error that could cause items in the inventory to disappear if the user pressed up against the loading boundaries.

Combat Indicators

During combat, any damage dealt by your primary skill will show up as floating numbers. The color will gain in intensity, changing hue as the amount of damage done increases. Additionally, any time Strato dodges or blocks an attack, a visual "Dodged!" or "Blocked! is displayed. Any status effect incurred (Poisoned, Paralyzed etc.) also has it's own visual indicator. Damage received by Strato is not shown, as it would be confused with damage dealt to an enemy. Instead, the top-left status bar flashes red.

Mining for Ores
Ever wonder just how much damage you're doing to that stubborn piece of Aeronite? Now you can tell! While mining ores, plants or rocks a yellow-blue indicator now appears telling you how much damage you've delt. This should make deciding what tool to use much easier.

Stat Indicators
Experience gained, along with Fatigued, Energy, and Health points restored all show up with visual indications on the screen. This happens whenever you make contact with the corresponding orb, or if you use a potion (eg. to heal yourself).

Bug Fixes
A critical error was reported by one of our players whereupon pressing against one of the chunk boundaries caused the inventory to be deleted, potentially rendering the game unstable. This has been fixed in this release, as well as the following issues:
  • Fixed Poison and Paralysis effects from not being applied.
  • Fixed Aeronite Wind effect and increased its strength and radius of effect
  • Fixed total armor defense calculation, where each item's stat variability was not being factored into calculations
  • Fixed pre-set starter chests and torches not being able to be dug out
  • Fixed deleted inventory items/ crashing when traversing freshly loaded areas at a high speed
  • Changed weapon damage sound to only play when the weapon is less than 15% durability, instead of 30%, and decreased the sound.
  • Adjusted weapon damage calculation which better takes into effect the skill's damage multiplier
To see the full list of changes, please visit <enter link here>.

Here at Tetravoxel Limited we would like to thank the community for all their suggestions, bug reports, and support since Caverns' release a little over a month ago. Together we hope to make Caverns: Lost Sky as fun, satisfying and rewarding as possible!

- Team Tetravoxel ( :
1 comments Read more

March 3

UPDATE: Patch 0.1.6

Update 0.1.6

Hello Everyone!

Today's update focuses on performance improvements and bug-fixes. After Update 0.1.4 we have been testing Caverns on many different computers, and we identified several performance bottlenecks. This week we rolled out a large number of changes designed to eliminate those bottlenecks.

Stutter Reduction
In the past, witnessing the green loading barrier usually meant you were in for a bad case of the stutters. This caused major playability issues, especially if you were under attack at the time. The latest build fixes these issues by removing almost all stuttering while new chunks are loading! Combat, mining, and movement and no longer impaired by sharp lag spikes.

New Features
Treasure Chest Improvements
During internal playtesting, we discovered that requiring the user to put away their current item to open a chest quickly became irritating. As a result, Strato can now open chests while wielding a weapon or a tool.

Crafting Improvements
The crafting menu has been re-arranged so that you can see the recipe list right under the "Craft" button, instead of forcing the user to scroll. Additionally, the status bar (upper left-hand corner) now flashes red whenever Strato takes damage for poison, enemy attacks, or high falls.

Bug Fixes
This week we also fixed a number of bugs, including an annoying issue which allowed Strato to kick a treasure chest over and over again. Only when the user stopped would the chest open. This has been fixed - one kick is enough!

Here are some of the highlights:
  • Fixed Strato being able to kick a treasure chest over and over before the popup opens
  • Fixed an issue which might cause voxel script entities (such as Poneroids) to freeze indefinitely in cramped spawn zones
  • Chunk loading barriers no longer appear when mining a chunk which has already finished loading.
For the full list of changes, see 0.1.5 Patch Notes and 0.1.6 Patch Notes.

Here at Tetravoxel Limited would like to thank the community for all their suggestions, bug reports, and support. Together we hope to make Caverns: Lost Sky as fun, satisfying and rewarding as possible!

- Team Tetravoxel ( :
1 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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