Rubikon

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Rubikon is Valve's custom physics engine used in Source 2. It replaces Havok, which is the main provider of physics for Source engine games.

Forks

A heavily modified version of Source 2, called S&box, uses modified version of Rubikon physics engine called "Box3D", which was designed to be constantly updated.^[1]

Media

• Sergiy Migdalskiy Debugging Techniques.pdf

References

References
1. gvarados (@gvarados) (August 3, 2024). "S&box has a new Physics Engine".  X (Twitter).. Retrieved on September 11, 2025.