What am I doing wrong?

Let's write the entertaining Minesweeper game.

Rules of the game:

1. The playing field is divided into adjacent cells (squares), some of which contain "mines".
2. The objective of the game is to clear the field, i.e. reveal all cells that don't contain mines.
3. If a cell with a mine is revealed, the game is lost. The mines are placed randomly.
4. If a revealed cell doesn't have a mine, a number appears in it, indicating how many "mined" cells are adjacent to the revealed cell. You can use these numbers to calculate the location of mines.
5. If the adjacent cells also do not contain mines, an "unmined" region is revealed up to cells that do have numbers.
6. Cells that you believe to contain mines can be flagged so you don't accidentally reveal them. The number of flags is equal to the number of mines on the game board.
7. If "unmined" cells are revealed, then the game is won.

Now let's start implementing the game:

To begin, create a MinesweeperGame class, which will implement the logic of the game. This class must inherit the Game class, which is part of CodeGym's cool "game engine".

This and other engine classes are located in the com.codegym.engine.cell package. To use them, the MinesweeperGame class must include the following import statement: import com.codegym.engine.cell.*;

If you did everything right, you will see the playing field when you start the application.