In its fiction, RimWorld draws a lot from Firefly. This is where it gets its subtle Western vibe - frontier living, an arid environment, sparse law enforcement, and the constant threat of outlaws. We're also heavily inspired by science fiction novels like Dune and Alastair Reynolds' Revelation Space series (which both Alistair Lindsay and I are huge fans of). The Warhammer 40,000 universe also forms part of our inspiration.

After five and a half years of development we're coming to the close of this chapter of RimWorld, launching on October 17, 2018.

If you're playing an unmodded game, just keep playing. Version 1.0 will be compatible with un-modded savegames from Beta 19 and Beta 18.

If you're playing a modded game, you should follow these two steps now:

• In Steam Library, right-click on RimWorld, select Properties, go to the Betas tab and select the "beta19" beta.
• Back up your mod files.
  
  • Copy all the files in C:\Program Files (x86)\Steam\steamapps\workshop\content\294100
  • Paste them all in C:\Program Files (x86)\Steam\steamapps\common\RimWorld\Mods

I'm recommending modders don't update in-place to prevent the above problem, but can't guarantee everyone will get the message.

1.0 is mostly the same as Beta 19, with a lot of bugfixes. The only significant new feature is a new food restriction system that allows you to determine what your colonists and prisoners are allowed to eat.

In terms of game design, the game draws most from the 800-pound gorrilla of the simulation genre, Dwarf Fortress. We also take ideas from indie hits like FTL (our semi-random event format) and Prison Architect (its way of presenting a complex world in a comprehensible, interactable way). And, there are many others.

RimWorld is a story generator. It’s designed to co-author tragic, twisted, and triumphant stories about imprisoned pirates, desperate colonists, starvation and survival. It works by controlling the “random” events that the world throws at you. Every thunderstorm, pirate raid, and traveling salesman is a card dealt into your story by the AI Storyteller (modeled after the AI Director from Left 4 Dead) who analyzes your situation and decides which event she thinks will make the best story.

There are several storytellers to choose from, and each one applies a different algorithm for generating random events. So if you want a different kind of story for your colony, you can just choose a different storyteller.

• Cassandra Classic aims to create a rising curve of tension over the course of the game. Early on, the most dangerous thing she'll do is send a psychotic squirrel after you. Later on, bands of scavengers will arrive. In the late game, look forward to combined-arms attacks from mercenaries mixed with lightning storms and crop blights. If you want a traditional tension and difficulty curve, go with Cassandra.
• Phoebe Friendly is for the player who just wants to build and watch a colony grow. She'll occasionally create minor disasters, but nothing that would threaten the existence of the colony. If you want a more relaxing game about growth and success, choose Phoebe.
• Randy Random follows no rules. He may give you some amazing stroke of luck, like a trader selling an advanced weapon for a low price or a group of helpful immigrants, followed by a near-unbeatable pirate attack combined with an electrical fire. If you think losing is fun, you might want to try Randy.

And we're considering other AI Storytellers, too. High population storytellers, starvation storytellers, seasonal storytellers, moody storytellers, and anything the community thinks up are all on the table.

It's not about winning and losing - it's about the drama, tragedy, and comedy that goes on in your colony.

In RimWorld, your colonists are not professional settlers – they’re survivors from a crashed passenger liner. They'll be accountants, homemakers, journalists, cooks, nobles, urchins, and soldiers.

Each character has a background that affects how they play. A nobleman will be great at social skills (for recruiting prisoners or negotiating trade prices), but refuse to do physical work. A farm oaf knows how to grow food, but cannot do research. A nerdy scientist is great at research, but cannot do social tasks at all. A genetically-engineered assassin can do nothing but kill – but he does that very well.

You’ll acquire more colonists by taking in refugees, capturing people in combat and turning them to your side, buying them from slave traders, rescuing them, or taking in migrants.

Over the course of long games, players develop a motley group of refugees, pirate raiders, purchased slaves, and crashlanded survivors. The diversity of people makes each colony unique.

You won't get hundreds of colonists - we want to keep the number small enough that you can know each one individually.

RimWorld uses an engine originally developed to power a tactical sim similar to Jagged Alliance 2. This means it has a lot of features designed to make small-team firefights interesting.

For example:

• There's a cover system that models low cover and leaning around corners.
• There's a really nuanced algorithm for determining and reporting hit chances based on distance, skill, weapon, lighting, angle, and cover.
• Weapons have some pretty deep stats.
• The AI plans and executes tactical moves like flanking while trying to stay out of the enemy's line of fire. It uses a number of heuristic algorithms to analyze the battlefield and use the space effectively. It works with allies and avoids bunching up.

Because of how important cover and positioning are in gunfights, our combat interacts deeply with the colony's layout and structure. This means players have to think about how they want to position their constructions to maximum advantage in future firefights. Combat in general is a lot more interesting than the traditional trading of blows you might expect in a base-building game. And it's possible to build a wide variety of base configurations for maximum tactical advantage against diverse foes.

This kind of game can be really hard to learn. So we've created an adaptive teaching system that watches your actions to figure out which parts of the game you understand, and teaches the parts you're missing. If you don't understand a control, the game will notice and help you out unobtrusively. If you already know something, the game won't interrupt you.

RimWorld also uses a notification system to make sure you don't miss anything that needs looking at. If you're low on food, or a colonist is about to go berserk, a message hovers in the corner of the screen informing you of the fact. No more getting annihilated because you missed some little detail. If you get annihilated, it'll be for a totally legitimate reason.

People in RimWorld each constantly observe their situation and surroundings in order to decide how to feel at any given moment. They respond to hunger and fatigue, witnessing death, disrespectfully unburied corpses, being wounded, being left in darkness, getting packed into cramped environments, sleeping outside or in the same room as others, and many other situations. You can inspect a character's psychology at any time to see what they're feeling and why.

When a colonist becomes too stressed, they may suffer a "mental break". Some will give up and wander the colony for a time. Some will leave. And some will, in dwarfish fashion, become psychotic and throw a violent tantrum.

The flavor of RimWorld is a mix between hard sci-fi and the Old West. It's a rim world at the edge of the galaxy, far from the civilized core worlds. The planet is vast and mostly empty, and there are no strong civilizing authorities anywhere nearby. You're on your own.

The core idea in the RimWorld universe is diversity. In the this setting, humanity is spread across the galaxy, yet lacks any way of traveling or communicating faster than light. Combined with the fact that stellar civilizations regress (due to war or plague) as often as they progress, this means that someone traveling between stars may end up interacting with people at any level of development, from pre-agricultural tribes to transcendent machine gods.

Your starting colonists in RimWorld are at a technological level in the middle of this span. But you may end up interacting with people at much lower and higher levels, as well as acquiring and using their tools and weapons. In RimWorld, a single fight can involve a bow and arrow, a revolver, a charged-shot pulse rifle, and a near-magical teleportation device.