Polishing Unity projects in depth
This section will focus on several of the finer points of what makes up any game, including the title screen and end screen, tutorial, camera, and audio. While the scripting you've done so far has mostly focused on game logic and mechanics, the scripts you write in this section will provide your game with a cohesive structure and frame the user experience.
Creating your game flow
The marble game is perfectly playable right now, but there's no introductory title screen to prepare the player or a reset/death screen that appears if they roll off the side of the level. A title screen and end screen are the two ends to your game flow, and you should be able to continue to play the game through the loop regardless of victory or loss.