Jumping down game?????

Hello, everyone ,I am making a jumping down game , and I want the screen going down itself every sec ,but I dont know how to do it, can someone tell me how to do it pls !! thank you very much!!!

I would look through the tutorials on scrolling, especially the paralax scrolling or endless jumping/climbing tutorials. Same logic, only have the scrolling go the opposite way. The Manual and Tutorials will answer about 99% of the basic questions you will have.