Try the following, it should fix the problem for you. Firstly make sure you clear your cache, check that your Java version is up to date, you can check everything here: https://www.whatismybrowser.com If these steps do not work test the game in another browser such as Firefox or Chrome. King have made a really good video…
Congrats you have reached the last level... for now ;) To be the first to know when the next level releases are join their Facebook fan page here- https://www.facebook.com/candycrushsaga
Make sure that you have the latest version of Candy Crush Saga installed, and also the Facebook app if you play while connected to Facebook, then try again to play the match game :)
Were you playing while connected to Facebook? If you log in again you should see your levels again. Simply click on the settings on the main menu to check if you are signed in or not.
Test the game in another browser such as Firefox or Chrome. King have made a really good video to help you troubleshoot these problems, check it out: https://www.youtube.com/watch?v=OESCE4Jj2tU