Player Movement in Unity 2D using Rigidbody2D | by James West | Nerd For Tech | Medium
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Unity3D基础教程】给初学者看的Unity教程（四）：通过制作Flappy Bird了解Native 2D中的RigidBody2D和Collider2D - 王选易- 博客园
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Unity - Manual: Rigidbody 2D
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Genoma Invaders - Unity Physics 2D Using Collider2D and Kinematic Rigidbody2D - Genoma Games
Rigidbody 2D - Official Unity Tutorial - YouTube
