Tutorial: Game Over Screen - CodingDino/Dino-Unity-Toolkit GitHub Wiki

Creating a game over screen is identical to the process for creating a title screen - it requires some text (such as "Game Over!") and a button to take you back to the Title. Follow the tutorial for creating a title screen to create the game over screen: Tutorial: Title Screen.

The Game Over screen is usually triggered by one of two things: Either running out of lives (Tutorial: Lives) or running out of time (Tutorial: Time Limit). See those tutorials for info on how to trigger the scene change to the game over scene.