What happens if Mario dies?

Answer 1

If mario dies in your game, you start all over. die too many times, and it's game over.

Answer 2

If Mario dies in a game, the player typically loses a life and must start over from a checkpoint or the beginning of the level, depending on the game's design. In some games, dying multiple times may result in a "game over" and require the player to restart from a previous save point.