(I) There are now many different genres of video games
in the world with amazing features and high quality.
(II) The input device used to manipulate video games is
called a game controller and varies across platforms.
(III) For example, a controller might consist of only a
button and a joystick, while another may feature a dozen
buttons and one or more joysticks. (IV) Early personal
computer games often needed a keyboard for
gameplay, or more commonly, required the user to buy
a separate joystick with at least one button. (V) Many
modern computer games, however, allow or require the
player to use a keyboard and a mouse simultaneously.