i wanna make a game with more than 80 levels and my problem is how to add this button as in angre birds menu ?
You'll have a main menu UI that then has a button that leads to a Worlds UI. You can make the world UI have lock buttons that will then lead you to each of the different "Worlds". The lock buttons you can control how someone gets to it, if they have to pay for it with in-game currency etc... You can do a search on YouTube, you can find tons of tutorials.
