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A sci-fi colony sim driven by an intelligent AI storyteller. Inspired by Dwarf Fortress and Firefly.

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Here’s Alpha 13 – Trapped With Your Ex!

To get your update, you can re-download from the same link as last time. Your personal download link never changes. Update emails with your links are being sent out over the next few hours. If anyone lost their download link, they can also get it resent at the automatic link resender.

Old saved games and worlds won’t work in this update, I’m afraid. So please don’t try to load them; they’ll just generate errors.

The end-user license agreement has been fully released this time, so be sure to take a look at it before downloading. It’ll apply to you when you download the update, and is also included with the game.

Below is the video and the major additions list, including permadeath mode, which I forgot to mention before. Have fun!


  • New permadeath mode. One save file, save on quit or autosave only, no take-backsies when something goes horribly, insanely, or laughably wrong. The way RimWorld was meant to be played.


  • Colonist family and social relationship system / Social relationships with friends, rivals, family, chats, arguments, and fights
  • Opinion system; pawns care about dozens of memories and situations to determine their opinions of each other
  • Family members out to cousins and beyond
  • Lovers, fiancees, marriages, ex-lovers, ex-spouses
  • Lovin’
  • People may get in social fights with those they dislike (even neutrals and enemies do this)
  • Animal bonding
  • People who leave the map while traveling, fleeing, being kidnapped, etc. can come back later as raiders, visitors, joiners, etc.
  • Marriage ceremonies and parties

Prison breaks

  • Prison breaks. Prisoners pick the locks, get out, seek weapons and work as a group to escape.


  • Self-reproducing, spreading underground insect hives
  • Insect hives are dangerous but produce succulent insect jelly

Animals and predators

  • Many more animals, some of which will hunt people
  • Some animals are now predators, including colony pets (e.g. cats catch squirrels)
  • Animals can gnaw corpses apart directly now

Threat response mode

  • Decide how colonists should auto-respond to threats: flee, attack, or ignore?


  • ‘Components’ resource used for machinery and electronics
  • Ground-traveling trade caravans from other factions
  • Deeper research tree with more low-tech options and more things to research
  • New fueled buildings: stove and generator
  • Various new lower and higher-tech production buildings
  • Two research tables: simple and hi-tech. Hi-tech is required for some projects.


  • New exotic infections: Gut worms, mechanite infections which give abilities at a cost of pain or fatigue, trauma savantism
  • New chronic diseases: Carcinoma, asthma, hearing loss
  • New “firefoam popper” provides a way to combat fire besides punching it.
  • Character records which keep stats on each character like number of kills, injuries, surgeries, etc.
  • Extreme desert biome
  • Colonists in relationships can share beds
  • New double bed; royal bed is now gold-trimmed and fancy
  • New flatscreen and megascreen TVs
  • Colonists can now visit sick people in bed to cheer them up
  • Sick people in bed can now watch TV
  • Building damage overlays
  • Days are now twice as long as before, with years being half as many days. (This means that years are exactly as long as before in actual play time, just divided into a smaller number of longer days.)
  • The year is now split into seasons instead of months.
  • Animal kibble
  • Deep rooms stay cool in the heat
  • Richer tale recording and better art descriptions
  • Hundreds of balance improvements, optimizations, tweaks and fixes
RimWorld Alpha 12 - Animal Taming released

RimWorld Alpha 12 - Animal Taming released

News 0 comments

Animal taming is here! You can now tame animals, milk them, eat them, and train them into whirling furry/scaly death machines! We’ve also added codified...

New RimWorld trailer!

New RimWorld trailer!

News 1 comment

I've just put together a hot new trailer for RimWorld showing some of the newest features. Enjoy.

RimWorld Alpha 11 - Sappers and Traps released

RimWorld Alpha 11 - Sappers and Traps released

News 2 comments

This update includes clever new AI strategies including sappers who blast and dig around your defences and raiders who burn crops. I’ve also added a...

Project Armory 3 for Alpha 10 is here!

Project Armory 3 for Alpha 10 is here!

Project Armory 2 comments

We hope you will enjoy this massive piece of work we've been working on for quite a while, and please, don't hesitate to inform us about any bugs, should...

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Post comment Comments  (0 - 10 of 90)

looks like fun. going to buy it at the end of the month also is the game still alive because looks like the last update was a few months ago ?

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Steam add this please?! Are you insane.....steam will just **** it up....it's better being and indie dev than joining the greedy publishers/stores that'll just ruin your plan with the game....

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It's too good to be on Steam ;) Rimworld is reaching maturity now in June 2015. Compared with June of 2014, it's like a late beta now!!! Amazing!!!!!

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lol no, it's being released on steam in 2016. someday between Q1 and Q2.

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Is this game free?

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man.. only if i had money to buy this game.. but no. you could buy 250 pieces of bread in this country :/

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no, you can buy the game here:

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Latest tweets from @tynansylvester

RimWorld players downloaded almost 6TB worth of Alpha 13 updates. Awesome! But the AWS bill... ouch!

May 5 2016

RT @ZAMofficial: We took a look at Rimworld, an in-dev space colony simulator which is a) moddable and b) very deadly: Zam.com

May 4 2016

This is fine T.co

May 3 2016

The most frighting thing we could find out among the stars is not lots of hostile alien species, but lots of dead ones.

May 1 2016

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