Use layers sparingly. The available layers must support multiple Games in the master project. Refactor to use Tags if possible. If you can write your Game without layer checks, please do. This also applies to adjusting physics collision matrixes, culling masks and cameras, etc. Most Games just set the camera to the UI layer since built in the index is always the same, but if you use a custom layer for your layer masks, please refactor or use a built in to achieve the look you need. If you need to reference layers in code, always use the layer name and not the index.