Mapgen4

from Red Blob Games
20 Jul 2018

Pick a starting seed, then paint mountains, valleys, and oceans on the map! It will simulate evaporation, wind, and rainfall to determine biomes and rivers.

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Play with the sliders to change the simulation and style. For example, try decreasing raininess slider to see how reducing rainfall will make rivers dry up, or try decreasing lg_min_flow to see more small streams.

Treat this as a tool. Everything you create with it is yours to do with as you please. Credit is appreciated but not required. Suggested tag: #mapgen4. Download a high resolution version:

Goals for this project:

Status of the project: Finished for now. I have a series of blog posts[2] about how I made these maps:

Also see my project from 2010[14], where I started developing these techniques. I have a long list of things I’d like to add, but I’m not actively working on them. I’d like to improve the UI, and also add trees, more biomes, towns, seasons, nations, watersheds, and lots more. Someday.

Email me at , or tweet to @redblobgames, or post a public comment: