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> Everything that is made with Unity or UE4 uses PhysX That's not true - UE4 games can be (and are) built against other physics engines.

• tokyodude 8y ago
  Most engines can use other physics engines. People have also used other engines in Unity
• aras_p 8y ago
  Yeah, I should have clarified: most games using Unity or UE4 are using PhysX, since that's what these two engines are using out of the box.