LegacyPhysicsExamples2Dproject which uses the older "Physics2D" API.PhysicsCore2Dcontains all the examples for the newer physics core API.
Each branch represents a specific version of Unity. As features are added in a public release, those features should be represented in that branch and future Unity version branches i.e. branch names of "2019", "2020", "2021" (etc) exist.
masterrepresents the current latest release of Unity, updated only when new final releases have been public for a while.unsupported/xxxrepresents versions that are currently in alpha/beta release state.
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