World generation

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Basics

Worlds in RimWorld are generated from either random or user-provided seeds that allow for a completely new experience every time. Each world is uniquely filled with multiple biomes that change what the world looks like and how it behaves. For example, some biomes feature a large amount of mountains, while others are full of grasslands.

Worlds may be named by the player, are arranged in a grid of locations, and come in many different sizes:

Optional map sizes

150x112

200x150

250x188

300x225

350x262

400x300

Every square on a world is unique, with its own biome, elevation, average temperature, terrain, and rainfall amount. A colony can be built on one square. World size has no affect on game performance, as the world is simply used as a seed.

The following controls are used on the World generation menu:

Mouse Controls
Left mouse button	Select location
Right mouse button	Clear selection
Middle mouse button	Pan (click+hold)

Keyboard Controls
PageUp or E	Zoom out
PageDown or F	Zoom in
Arrow up or W	Pan up
Arrow down or S	Pan down
Arrow left or A	Pan Left
Arrow right or D	Pan Right

In world generation four main features of the world are generated with each tile and can be seen with the various modes of the map. Each feature, biome, elevation, temperature, and rainfall, are logical with the tiles near to them. Each feature goes along with the biome of the tiles and the tiles around it. Each biome has its unique trees, animals, temperatures, rainfall and growing periods.

Features

There are four main features that effect game play in that tile on a generated world.

Temperature

Temperature is one of the more varying features. each tile has its own averages for temperature based on the biome. The only the averages are presented in the world generation menu, but can directly affect your game as your colonists could fry and get heat stroke in extreme heat or freeze to a point that when they die, their bodies of frozen and will never decay. Temperature is related to the other three features of a tile in a generated world. Naturally, higher elevation and a more northern biome is colder.

Biomes

Main article: Biomes

There are nine biomes in Rimworld, and on a normally generated world, all of them are represented. They each correspond to specific features. Each biome is more likely to include certain features based on it's real world equivalent.

Ice Sheet

The ice sheet is represented with a light blue. It is extremely cold with a growing season of never. This biome is located in the northern region of the map and is impossible to settle in. The game will not allow you to settle in this area.

Tundra

The tundra is located in the Northern part of the map. It has a very cold temperature and is arguably the most difficult are to settle in. The growing season ranges from never to the latter half of the year.