Time for action – adding difficulty levels

1. Add the following declarations to the Game1 class:

   Private currentLevel As Integer = 0
   Private linesCompletedThisLevel As Integer = 0
   
   Private Const floodAccelerationPerLevel As Single= 0.5
   
   Private levelTextPosition As Vector2 = new Vector2(512, 215)

2. Add the StartNewLevel() method to the Game1 class:

   Private Sub StartNewLevel()
       currentLevel += 1
       floodCount = 0.0
       linesCompletedThisLevel = 0
       floodIncreaseAmount += floodAccelerationPerLevel
       _gameBoard.ClearBoard()
       _gameBoard.GenerateNewPieces(false)
   End Sub

3. Modify the Update() method of the Game1 class by replacing the case section for GameState.TitleScreen with the following:

   Case GameStates.TitleScreen
       If (Keyboard.GetState().IsKeyDown(Keys.Space)) Then
           playerScore = 0
           currentLevel = 0
           floodIncreaseAmount = 0.0
           StartNewLevel()
           gameState = GameStates.Playing
       End If

4. Modify the CheckScoringChain() method to increment the linesCompletedThisLevel...