First Steps With the Unity Game Engine - UltraStar-Deluxe/Play GitHub Wiki
UltraStar Play is built on top of the Unity3D platform. If you want to contribute to UltraStar Play and are new to Unity then you should check out the following tutorials and documentation.
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Official Unity manual: https://docs.unity3d.com/Manual/UnityOverview.html
- start with installing Unity and the main windows in the Unity Editor
- afterwards, continue with Scenes, GameObjects, Prefabs
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Tutorial: Introduction to Unity from raywenderlich.com
- content: download and install Unity, most important windows, GameObjects and their Components and how to manipulate them in the Unity Editor
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Tutorial: Creating a Pong game: https://noobtuts.com/unity/2d-pong-game
- content: download and install Unity, most important windows, GameObjects, playing and stopping the scene, some import settings, some 2D physics (Collider), some scripting
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There are also lots of video tutorials on YouTube
After you understood the basics of the Unity platform, you should consider reading about the UltraStar Play UI.