I am working on a racing game. At the current state I am starting the game and I am directly in the world, but I want to get first to the main menu and then into the game. I have also a Nifty GUI with the start button and the ScreenController. On the button click it can write something on the console, but i don’t know how to start the other SimpleApplication. I searched in the internet about this question, but i found nothing. So, please help.