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.
"master" represents the current latest release of Unity, updated only when new 2D physics features land in a public final release.
"unsupported/" represents versions that are current in alpha/beta release state.
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