Choose phase

Personal I’m creating a racing game and I wonder how can I create a scene selection system (scenario) for the player, eg when entering the game have the option of two scenarios one day and one night, I want to know how to do this, use that script … using Unity for some time further understand a good script, I count on the cooperation of everyone.

You need a menu. If there is just a few differences between those twos scenearios (light intensity and skybox, let’s say), just use static vars to set up the scene once loaded. If the is a lot of differences, use two differents scenes.