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RimWorld is an indie space colony management game developed by Ludeon Studios, a Canadian-based game studio founded by Tynan Sylvester.
Read more about the game at About RimWorld.

The current stable versions are 1.5.4241 and 1.23, and a complete version history can be found via the Version history page.

For info on releases, see the Ludeon development blog and Double Eleven Patch Feed respectively.

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▪  Steam Page

▪  Console Edition Page

▪  Tynan on Twitter

▪  Ludeon Forums

▪  RimWorld on Reddit

▪  RimWorld Discord

▪  RimWorld IRC Channel

▪  Bay 12 forum thread

Need some help? Check out the guides for information!

Concepts

Basics

▪ Controls
▪ User interface
▪ Learning helper
▪ Lore
▪ Fiction Primer

▪ Guides
▪ Colony Building
▪ Quickstart Guides

Gameplay

▪ Caravan
▪ Environment
▪ Events
▪ Research

▪ Quests
▪ Time
▪ Trade
▪ Orders

Extras

▪ Version History
▪ Save file
▪ Development mode
▪ Mods
▪ Modding tutorials

Combat

▪ Cover
▪ Drafting
▪ Offense
▪ Structures
▪ Tactics

World

▪ Scenario system
▪ AI storytellers
▪ World generation
▪ Biomes
▪ Factions

DLC

Royalty

▪ Titles
▪ Quests
▪ Psycasts
▪ Techprints
▪ Persona weapons

Ideology

▪ Ideoligions
▪ Roles
▪ Rituals
▪ Styles
▪ Slavery

Biotech

▪ Pregnancy & Children
▪ Genes & Xenotypes
▪ Mechanitors
▪ Mech gestation
▪ Pollution

Anomaly

▪ Void study
▪ Monolith
▪ Entities
▪ Containment
▪ Psychic rituals

Items

Gear

▪ Weapons
▪ Apparel
▪ Armor
▪ Clothing
▪ Utility

Resources

▪ Materials
▪ Textiles
▪ Drugs
▪ Food
▪ Medicine

Technology

▪ Electricity
▪ Deep drilling
▪ Moisture pumps
▪ Mineral scanning
▪ Bionics

Building

▪ Zones
▪ Structures
▪ Production
▪ Furniture
▪ Power

▪ Security
▪ Misc
▪ Floors
▪ Recreation
▪ Temperature

Life

Characters

▪ Backstories
▪ Health
▪ Body parts
▪ Mood
▪ Needs

▪ Skills
▪ Social
▪ Thoughts
▪ Traits

Flora

▪ Decorative
▪ Domesticated
▪ Trees
▪ Wild

Fauna

▪ Colonists
▪ Prisoners
▪ Raiders
▪ Visitors

▪ Animals
▪ Mechanoids