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A modern, yet classic sci-fi roguelike,
spiritual successor to D**m, the Roguelike.

An epic battle of a lone marine against the forces of hell,
taking place on the moons of Jupiter.




The Beta is here! If you’re a Beta backer or above you should by now have received an e-mail from us with the Beta 0.3.0 Steam Key - check your spam folder! If you can’t find it, please get in touch with us.

The game is still a deep work in progress, but has come a very long way from the early pre-Alpha stages, and has been gradually been improving with input and suggestions from the Inner Circle and Alpha communities. We’re thrilled to open this up now to many more fans and to get more feedback as Jupiter Hell moves into the next stage of development!

The beta is working on both Windows and Linux. OSX users, please be a little patient with us. From now on all updates to the game will be via Steam.

Jupiter Hell on Steam

The Steam page for Jupiter Hell is now live. It’s a big help for us if you wishlist it, so please do so even if you haven’t got access to the game yet!

Road to early access

Whilst the core of the game is in place there is still a lot more content to get loaded in. As we move towards open release on Early Access our development focus is now switching towards adding in layers and layers of content. That means more of the following:

  • Player classes with unique traits and abilities
  • Challenge modes, online leaderboards, player achievements, and extra difficulty levels
  • A longer game with two more major locations
  • Modular weapons and armor, more weapons, more items
  • More enemies, bosses and enemy variety
  • Plot details, quests, cutscenes
  • Music, sound, voice acting
  • UI configuration, mouse and controller support

And of course many other things secret or yet to be conceived! Community support is vital at this stage to let us know what works, what doesn’t, and feed in new ideas and suggestions. Make sure to try the beta out and give feedback via the community channels. Let’s plays and other recordings of the game are very welcome - please send us a link to anything you publish as we love to see them!

Jupiter Hell community

We’re thrilled to get to this stage, and we couldn’t do it without the great support of our fans. We always want more feedback, so if you have something to say please get in touch via:

Also, most of the team will be at GiC next week. Get in touch if you want to meet up.

Alpha 0.2.0 released

Development of Jupiter Hell continues apace! We have now released version Alpha 0.2.0. We've made many new advances in the last few versions, including:

  • Saving and loading (though obviously not after death)
  • Active traits - get new Headshot, Shredder and Overkill actions
  • New cover and dodge systems, with UI aids
  • Degrading armour on enemies, with graphical indicators
  • New level generators
  • Graphical enhancements and variety added to tilesets throughout the game
  • Loot crates and basic terminals
  • Destructible doors and scenery
  • Various tweaks and bug-killing, including some long-standing issues

Alpha backers can go download it now from the Alpha Forums. Feedback from playtesting is incredibly welcome!

Path to Beta

Our eyes are now set on the Beta release, which will hit several new development milestones and be open to many more backers. We are currently implementing:

  • Steam integration, including auto-updating
  • Vulkan port (hopefully OSX too)
  • More character traits and active commands
  • Weapon and armor variations (random traits) + more weapon types, with new gameplay interactions
  • More environmental interaction (locked/broken doors, many more options for terminals)
  • More enemies to play with
  • Dungeon branches for varied paths through the game
  • Secret things!

We’re tentatively aiming for early October for the first Beta release.

PAX West

Kornel Kisielewicz will be bringing Jupiter Hell to PAX West Seattle, 31-Aug to 3-Sep. If you’re attending please say hi!

To keep updated on a more regular basis remember to check out our Twitter feed, our regular development streams on Twitch, and come chat on the Discord channels!

Jupiter Hell Alpha released!

After many months of hard work, with much love and support from our community, we have now shipped Jupiter Hell’s first Alpha release! We're now on Alpha 0.0.1, which is a good start. This is a mega improvement over what we’ve delivered so far, including:

  • The game is fully beatable - 15 levels split into 5 level episodes with an endboss at level 15, with extra variety in the early levels
  • Basic systems for most parts of the game are in place, though everything is being constantly iterated on and improved
  • No save/load just yet, but you definitely can die and even get a high score

Head over to the forums to read release the notes and download the alpha if you’re an alpha level backer. It’s available for both Windows and Linux.

As seen above we’ve improved the physics. Yes, this is still a turn-based game :P

There are no restrictions on our alpha backers streaming the game or putting recordings on YouTube - we just ask that you share them round! You can watch PyroL get to grips with the game on his channel.

Coming Next

Our next big milestone will be the Alpha midpoint, intended for June. This will represent the complete minimal game experience, with all major technical tasks finished. That includes the following key details:

  • Engine - Vulkan backend
  • Engine - Animation system overhaul
  • Engine - Volumetric algorithms (for explosions & light)
  • Gameplay - Save/load
  • Gameplay - Final overhaul of cover/dodge
  • Gameplay - Base set of traits and character customisation
  • Gameplay - Item variety
  • Gameplay - More environment interaction
  • Art - Callisto and Europa base art complete
  • Art - Animations overhauled
  • Art - Base UI art complete
  • Art - Base set of monsters complete

Road to Beta

Beta backers are probably feeling hungry to get their hands on the game right now. Well the good news is we’re working towards that, with a plan for a major milestone beta release later this year. This will have DoomRL levels of playability, content and features (minus the crazy number of challenges and difficulty levels), engine work closed apart from optimization, special effects, porting, editor improvement. All “known bugs” should be addressed. Our tentative release date for this is September, but please be kind to us if that slips as we work towards these major goals.

Seven Day Roguelikes

If you’re not an alpha backer and you have a roguelike itch to scratch, then you’re in luck! Over 100 new roguelikes have just been released for free as part of the Seven Day Roguelike Challenge. DoomRL started as a similar small and innovative multi-day project, so we’re very supportive of these new games. Our own Darren Grey has released a game as part of it called Time To Die, a roguelike about time manipulation.


Thanks again for all the messages of support you’ve been giving, and the positive feedback on the latest releases. We’re very grateful for our awesome community, and we hope to see even more people engaged with the alpha release. Keep the comments coming in! Your input and critique is invaluable at this stage. Be sure to join the ChaosForge Discord and follow activity on Twitch and Twitter.

Kornel will be at GDC next week. If you’re at the event then get in touch, or join in the Roguelike Devs @ GDC meet.


Jupiter Hell is a roguelike set in a 90's flavored sci-fi universe. Set on the moons of Jupiter, the game pits a lone space marine against overwhelming demonic forces. Rip and tear zombies, demons and unmentionable monstrosities, using classic weaponry such as shotguns, chainguns, railguns and the trusty chainsaw. All to the shine of CRT monitors and the tune of heavy metal!

Dive deep into a true form of the 30 year old roguelike game genre that has resurged in popularity. Experience turn-based, grid-based permadeath and fully procedural levels, all in glorious 3D visuals. Get ready for the spiritual successor to DoomRL, the parody roguelike that years ago streamlined the traditional format and popularised a new wave of accessible roguelikes. Distilled, hardcore gameplay, fast-paced challenge and limitless death all await.

Welcome to Jupiter Hell.


True Roguelike!

  • Permadeath adds tension and significance to gameplay decisions
  • Turn-based and grid-based world to emphasise tactical decision making
  • Procedural environments mean you never know what’s lurking behind the next corner
  • Brutal but fair difficulty will have you constantly coming back for more

Fluid Gameplay

  • Dynamic turn-based action with adaptive animation lets you play at your own pace
  • Intuitive UI for clear and fast decision-making
  • Streamlined gameplay centres on the action instead of micromanagement
  • Action-centric game flow with repeated peaks of blood-stained joy

Smart Procedural Generation

  • Sadistic algorithms create unending challenges
  • Randomised missions intertwine with adaptive plot arcs for continuous variety
  • Generated events and environmental interactions keep you constantly engaged
  • Built upon decades of expertise in producing truly engaging procedural content

Limitless Challenge

  • Highly varied enemies require different strategies to beat, especially in combination
  • Unique enemy behaviours and skills
  • Legendary boss battles that will test your worth as a player
  • Advanced difficulty modes and special challenges for the most masochistic players