This section contains documentation for users developing 2D games in Unity. Note that many areas of the Unity documentation apply to both 2D and 3D development; this section focuses solely on 2D-specific features and functionality.
See documentation on 2D and 3D mode settings for information on how to change the 2D/3D mode how the modes differ. See 2D or 3D Projects if you’re not sure whether you should be working in 2D or 3D.
Is something described here not working as you expect it to? It might be a Known Issue. Please check with the Issue Tracker at issuetracker.unity3d.com.