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Mapgen4

redblobgames.com

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Spec score 7.3 #19 of 27 in Game Map Generators

Spec sheet

Purpose
Mapgen4 is a procedural wilderness map generator.Read 3 Oct 2026 · redblobgames.com
Audience
Red Blob Games says its main audience is independent, student, and hobbyist software developers.Read 2 Oct 2026 · redblobgames.com
Support
The Mapgen4 page invites users to email the maker or comment on the page.Read 3 Oct 2026 · redblobgames.com
Founded
2018Read 28 Sep 2026 · redblobgames.com
Maker
Red Blob Games identifies Amit Patel as its maker and says he makes interactive visual explanations of math and algorithms.Read 3 Oct 2026 · redblobgames.com
Code license
Mapgen4 and its helper libraries are licensed under Apache v2, and the maker says they can be used in commercial projects.Read 2 Oct 2026 · github.com
Controls
Sliders let you change the simulation and map style.Read 3 Oct 2026 · redblobgames.com
Download and local use
The repository provides the source code and instructions to build it with npm or pnpm and run it locally in a browser.Read 2 Oct 2026 · github.com
Export
The page offers a high resolution image download and says it does not work on all platforms.Read 3 Oct 2026 · redblobgames.com
Export and usage
The page offers a high-resolution image download and says users may do as they please with maps they create; credit is appreciated but not required.Read 2 Oct 2026 · redblobgames.com
Limits
The README says the code can support over one million Voronoi cells, while rendering and other parameters are designed to look best around 25,000 cells.Read 3 Oct 2026 · github.com
Local use
The README gives build instructions and says to run a local HTTP server and visit embed.html in a browser.Read 3 Oct 2026 · github.com
Planned omissions
The maker lists drawing rivers, sphere output, natural resources, towns, forests, names, roads, and nations as features left for a future project.Read 3 Oct 2026 · github.com
Project status
The maker describes the project as finished and mostly inactive.Read 3 Oct 2026 · redblobgames.com
Security and compliance
The opened Mapgen4 page and repository do not state any security or compliance certifications.Read 2 Oct 2026 · redblobgames.com
Simulation
The generator simulates evaporation, wind, and rainfall to determine biomes and rivers.Read 3 Oct 2026 · redblobgames.com
Source code
The source is available on GitHub, and the README says Mapgen4 and the maker's helper libraries are licensed under Apache v2 for use in commercial projects.Read 3 Oct 2026 · github.com
Style
Its 3D rendering uses a custom projection and outline intended to give the map a hand-drawn look.Read 3 Oct 2026 · redblobgames.com
Terrain editing
You choose a starting seed and paint mountains, valleys, and oceans on the map.Read 3 Oct 2026 · redblobgames.com
Terrain style
It aims for a hand-drawn-inspired look, rendering terrain in 3D with a custom projection and outline.Read 2 Oct 2026 · redblobgames.com
Unbuilt features
The maker lists drawing rivers, sphere output, resources, towns, forests, names, roads, and nations as features that could be added in a future project.Read 2 Oct 2026 · github.com
Usage rights
The maker says anything created with the tool is yours to use as you please, and credit is appreciated but not required.Read 3 Oct 2026 · redblobgames.com

Where Specifiction places it

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