CHALLENGES

1. Improve the Hangman game by separating the display of letters correctly guessed from letters incorrectly guessed.

2. Increase the size of the game's array and make the required modifications to the program's code so that you can provide a bigger pool from which to draw secret words.

3. Add a CheckBox control to the game just under the PictureBox control and use it to give the player the option of displaying or hiding the GroupBox control and its contents. Adjust the size of the form as appropriate.

4. The Hangman game can sometimes draw the same letter twice in a row. Prevent this from happening. (Hint: One way to do this is to use a static variable.)