OpenSandbox³

Modern. Free. Open. 20MB.

Inspired by GMod, powered by SourceTech!

Our new project: 100% open, free, and accessible. A sandbox game on SourceTech engine that runs on anything, weighs just 20MB, and welcomes modders to reshape its core.

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20MB Total

Smaller than a couple of its own screenshots. Downloads instantly, runs anywhere.

🔓

Fully Open Source

Engine, SDK, tools, assets – everything. Modify, redistribute, learn.

🖥️

Runs on Anything

Integrated graphics, old laptops, potato PCs. No excuses.

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Modding

Mod the engine and game in C, script gameplay in JS.

TECH SPECS

20 MB
Total Size
100+ FPS
On 2013 integrated graphics
Vulkan
Modern graphics API
C / JS
API for mods and games
100%
Free & Open

Coming soon!

Download the game, explore the source, or join our community.

🔥 Download OpenSandbox³ 📖 View Source