Design the Number puzzle game using JavaFx GUI library. Each level will display one crossword Math block. Use the following blocks for 4 levels of the games. Use the Next button to move to the next level. As a developer you have to make sure of the number validation. If user entered non-numeric value then program must raise InputMismatchException. Also, create a custom Exception named NullValueException to validate the number block. On the click of Next Button, if user left number block as null then program must raise NullValueException.