I got class: MainGame with all game code (with simpleInitApp), Game and Menu.

Now i wanna make game main class. There’s a main method. Now question: how simple in add MainGame and as states? So when i run game it will firt run with Nifty GUI. In that menu i press button which start

Before i was using TWL and it was much easier i think.

This might help:

There are also a whole bunch of tutorials on UI, app states, nifty, etc…just look in the tutorials section of the wiki.