The application is divided in three vertical sections.
Section 1 contains 4 buttons: GEN, PLAY, INPUT, STAT.
Section 2 contains the grid where the sudoku game takes place.
Section 3 contains the parameters related to the 4 previous buttons.
The game can start from the GEN button, generating a sudoku by choosing between three difficulty levels, or from the INPUT button if you already have a sudoku to solve.
Once the sudoku is generated you have to click the PLAY button to insert new numbers ("num" active), or to insert annotations ("note" active).
The STAT button provides statistics about the sudoku and its solution.