# RimWorld

RimWorld is a construction and management simulation video game developed by Canadian game designer Tynan Sylvester and published by Ludeon Studios. Originally called Eclipse Colony, it was initially released as a Kickstarter crowdfunding project in early access for Microsoft Windows, macOS, and Linux in November 2013, and was released on October 17, 2018. The game was released for PlayStation 4 and Xbox One as RimWorld Console Edition on July 29, 2022, with development and publishing being handled by Double Eleven. Rather than a test of skill or a challenge, the game is intended to be an AI-powered "story generator", where the game is used as the medium for players to experience narrative adventures.

## Plot

The game happens in the distant future, where humans are spread across the universe but cannot travel faster than the speed of light. Planets and star systems develop in isolation from each other, and while some societies advance technologically, others regress due to war or disease. As a result, there is a massive range of technological levels among societies, from Neolithic tribes to reality-transcending machine gods.
RimWorld has a small variety of starting scenarios to choose from, although the core narrative is largely the same. The player characters are stranded on a procedurally generated planet located in the frontiers of known space (a "rimworld"). They must contend with both the environment and hostile inhabitants of the planet to survive and eventually escape. As time passes, more characters may join the colony; they are able to be rescued after crash-landing on the player map, to wander in, or be captured after a raid.
Ending the game, the player must either research how to build and then make a spaceship, or find a broken-down ship with the help of a friendly AI. After beginning to build the ship, the player must defend it for fifteen days as other desperate inhabitants of the planet attempt to seize control of it. After escaping the planet with at least one colonist, the credits roll. With the Royalty downloadable content, the game can also end by hosting the High Stellarch, leader of one of the factions that inhabit the Rim, and leaving the colony with them. With the Ideology DLC the Archonexus ending is made available, which involves selling the colony to other groups for parts of a map to eventually reach the Archonexus, a massive AI-controlled computer capable of controlling the entire planet. With the Anomaly DLC, another exclusive ending is added, where a character "awakens" the Void, the main focus of the DLC.

## Gameplay

The objective of the game is to ensure the survival of a colony of people, fighting against various environmental and/or internal events through randomly generated events in a customizable world. As the game progresses events become progressively harder and the player can unlock more advanced technology through research. The game has a top down perspective, two-dimensional view.

### Random event and "story" generation

In-game events are procedurally generated by an AI storyteller, which is central to gameplay; game difficulty, event difficulty and difficulty progression depend on its settings. The AI storyteller will analyze the player's current situation and choose events based on what it assesses will make the most interesting narrative. The game has three preconfigured AI storytellers, "Cassandra Classic", who follows traditional storytelling techniques of rising and falling tension, "Phoebe Chillax", a more laid-back storyteller, and "Randy Random", who forsakes narrative altogether in favor of randomness and excitement. There are 6 different preset difficulties to choose from along with a custom difficulty option. These influence the severity and frequency of events as well as the good, neutral, and bad balance of events. Events can range from simple occurrences such as wild animals wandering into the map or spacecraft debris crash landing to catastrophic long-lasting events such as cold snaps or volcanic winters.
The game has two save-modes. Commitment mode acts as RimWorld's permadeath mode, disabling manual saving, and Reload anytime mode allows the player to save and load freely, giving the player a chance to undo an event.

### Characters

Player characters ("pawns") are typically not directly controlled by the player themselves, but instead given tasks and orders to be completed (e.g. build a wall, tailor a shirt, etc.) with priority that can be separately assigned by the player. Each character has a randomly generated background, set of traits and skills, and relations with other characters, which affect how they can contribute to or endanger the colony, and how they may interact with other characters. For combat encounters, colonists can be "drafted" and directed manually by the player, though in this state they are generally unable to interact with their surroundings as usual.
Characters are able to have social relationships with each other, and possess opinions of one another, affected by a variety of factors. These relationships can benefit or detract from the needs and joys of a character, and poor social relationships may result in poor mood and fights.
Colonists' mental stability are represented by a mood meter, affected by basic or complex needs, personality traits, and character backstories. Characters require food, rest, and shelter. They will request a place to sit while eating, well-made and undamaged clothes, and enough time for recreation including stargazing, cloud watching or playing chess. If needs are left unmet, characters may have "mental breaks" such as going into a daze or even going berserk and attacking other characters.
Animals in the game may be domesticated or tamed, and can form relationships with human characters, but they cannot be controlled or drafted like a colonist. Certain animals may be taught commands, which vary from simply obeying its master to defending them if attacked to occasionally carrying and storing items.

### Technological progress

Players can research new technologies by constructing research stations. These research stations allow players to progress along a tech tree, starting at tribal technologies like simple clothing, all the way to space-age technology like nuclear reactors for a spaceship. Players may harness electricity, which unlocks a plethora of machines and increases the colony's efficiency, but they are forced to find ways to generate electricity, including wind turbines, solar panels, or geothermal power stations. Players can also unlock other advancements like medicine, advanced weaponry, or drugs.

### Combat

Players may be forced into several combative events. For example, during a pirate attack, the player will have to defend the colony by either drafting the characters or by building defensive mechanisms around the colony. Defensive measures may have traps and automated turrets. A key mechanic in combat is cover. Ducking behind cover, such as trees, walls or sandbags, gives characters a much lower chance of being hit by projectiles during firefights.

### Starvation

Characters in the game need constant nourishment. One of the challenges of a larger colony is finding a way to feed all the colonists. Players may combine hunting, farming, animal husbandry, and trading to meet the colonist's needs. Wild animals can be lured and tamed with food, but there is a chance that certain animals will attack the tamer instead. Upon being tamed, domestic animals can reproduce, and certain animals may also be trained to assist in combat and hauling materials around the colony.

### Colonization

On December 20, 2016, Alpha version 16 "Wanderlust" was released. Many new features were added regarding the world map, including: a spherical world map, time-zones, factions now starting with many bases, the ability to travel across the whole world map, the ability to set up multiple colonies, world generation, and customizable world map parameters. It is possible for players to attack other bases and plunder resources from them, angering the attacked faction in the process.

### Modifications

Players are able to install modifications (known as "mods") distributed via the Steam Workshop, the game's official forums, or other distribution sites. The game is known for its active modding community, regularly publishing mods from simple quality of life upgrades to complete gameplay overhauls.

## Development

Tynan Sylvester (born 1986 in Canada), the lead developer for RimWorld, had his first experience with game design by creating custom levels for Unreal Tournament in 2000, as a middle schooler. In 2008, he took on a job at Irrational Games and helped develop BioShock Infinite for four years, before leaving the company in February 2012 to become an independent game developer. As he tried to figure out what sort of game he would develop, Sylvester made a series of prototypes of games resembling Project Zomboid, Smash TV, Football Manager, and Hitman. He settled on the RimWorld concept after a game test with friends one evening, during which two of them became so absorbed that they couldn't bring themselves to leave until 2 AM: "People were falling asleep but they still wanted to play". RimWorld was inspired by Dwarf Fortress and Firefly.
RimWorld was first publicly revealed on 15 September 2013. A Kickstarter campaign was launched for RimWorld on 2 October 2013, which earned $268,132 in 30 days. The first public alpha build of the game came out on 4 November 2013. From 2013 to 2018, the development team hovered between two and three developers. The first beta version was released on 18 November 2017. The game went live on 17 October 2018. After release, the team scaled up to seven developers, allowing for the development of multiple projects in parallel.
A console version for RimWorld was announced on 29 June 2022. The console version was developed by Double Eleven, with development beginning "long before" the PC version's Ideology expansion was released in July 2021. Key challenges during development were adapting the user interface for players without a keyboard, as well as optimizing the game for console hardware. RimWorld Console Edition released for PlayStation 4 and Xbox One on 29 July 2022.

## Reception

Aggregate score :
| Aggregator | Score |
| Metacritic | PC: 87/100 XONE: 92/100 |
Review scores :
| Publication | Score |
| GameStar | 85/100 |
| IGN | 9/10 |
| PC Gamer (US) | 74/100 |
| Gry-Online | 9.5/10 |
| Strategy Gamer | |
RimWorld has received "generally favorable" reviews for Windows according to Metacritic, a review aggregator; the Xbox One version received "universal acclaim". Nomura Hikaru of IGN rated the game 9/10, describing it as "an all-in-one package for management simulation", and writing positively of the way it handled the player failing and its ability to tell a story. Sam Greer of PC Gamer gave a generally positive review, declaring that it was "a rich colony sim" and finding that its mid and late games were entertaining, while disliking the early game. Brendan Caldwell of Rock Paper Shotgun wrote positively of the game, commending its ability to create drama. RimWorld has been favorably compared to other management-survival games including Dwarf Fortress.

### Accolades

In 2016, RimWorld was voted Indie DB's "indie of the year". In 2018, RimWorld was voted Steam's Top User-Rated Game, from all categories. The Academy of Interactive Arts & Sciences nominated RimWorld for "Strategy/Simulation Game of the Year" during the 22nd Annual D.I.C.E. Awards. In 2020, RimWorld was ranked the best management game on the PC in Rock Paper Shotgun.

### Revenue

In February 2018, it was announced by Sylvester that RimWorld had sold over a million copies. By August 2020, it was estimated that RimWorld had accumulated well over 100 million dollars in revenue, making it one of the most popular indie games on Steam.

### Legacy

A team of modders responsible for RimWorld's Combat Extended mod went on to create Ascent Of Ashes, a colony simulation game inspired by RimWorld that was planned to be released in early access in November 2023, but has since been pushed back to July 2025. Another game that took inspiration from RimWorld was Palworld, an action-adventure, survival, and monster-taming game that released as early access in January 2024.

## Downloadable content

On February 24, 2020, the first downloadable content (DLC), Royalty, was released with the 1.1 update, adding a new empire faction and psylink technology for colonists to use. It introduces the concept of royal titles, mechanoid clusters, 13 more songs to the soundtrack, more possible quests in addition to more body implants and types of weapons. On July 20, 2021, the second DLC, Ideology, was released with the 1.3 update, adding belief systems based around several memes which make up the core of the ideology. Each ideology adds new buildings, apparel, quests, and social roles. New raid types, animal pens, mortar barrels, and caravan reworks were added as part of the free update.
On October 21, 2022, the third DLC, Biotech, was released alongside the 1.4 update. The DLC introduced a new mechanoid building mechanic allowing the construction of robots that can assist the colony with labor or combat, the ability for colonists to become pregnant and raise new families, and new options to genetically modify colonists into xenohumans granting special abilities and traits. New factions with xenohumans have been added ranging from super soldiers to neanderthals. Pollution emitted from constructed mechanoids can cause severe damage to colonies by causing sickness, sun blockage from smog and awakening of hibernating underground creatures. The update also improved the game's initial loading time by around 37%.
On March 13, 2024, the fourth DLC, Anomaly, was announced on X. The DLC adds more horror gameplay aspects. It was released on April 11 and was accompanied with a free major update which integrated popular mods.

## Temporary ban in Australia

In February 2022, a previously unannounced port of the game for consoles was refused classification by the Australian Classification Board for its depictions of drug use. The game was pulled from the digital storefront Steam for Australian users without input from the developers. They said that they were unsure of the reasoning, but were "working to resolve this situation and make RimWorld available to everyone again as soon as possible". On April 20, 2022 the game was classified as R18+ in Australia and it was made available on Steam again.