Introduction    Games
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 IsGame()        Indicates if the system has joystick
 jButton1()      Indicates if the button 1 of the joystick is pressed
 jButton2()      Indicates if the button 2 of the joystick is pressed
 jClick()        Indicates if any button of the joystick has been pressed
 jInArea()       Determines if the joystick is on a zone
 jPosX()         Indicates the X position of the joystick
 jPosY()         Indicates the Y position of the joystick
 Puzzle()        Play the Puzzle
 Serpent()       Play the Snake
 SpeakGame()     Generates a sound by the speaker
 Tetris()        Play Tetris