Start a new puzzle with an empty grid so you can enter new start data. Any changes you made to the current puzzle are lost unless you save them first.
Open a saved puzzle from the disk. The state of the puzzle is the same as when it was saved. You can browse to find any file on your computer with a ".SUD" extension. Any changes you made to the current puzzle are lost unless you save them first.
Save the current puzzle to a file on disk. You are asked for a filename and folder to save it in. The file extension ".SUD" is automatically added to the name. The current puzzle is not affected by saving it.
Exit the Zudoku program. Any changes you made to the current puzzle are lost unless you save them first.