Hunt-the-pixel
Hunt-the-pixel is a humorous term for some
point and click adventure games. Some of these types of
games include puzzles whose sole difficulty lies in finding a needed object on the screen. In cases where this object is shown quite small (i.e. only a few pixels). The predecessor of this phenomenon in
text adventures is called guess-the-verb.
Often one does not have the faintest idea what gizmo one is looking for; only that the game won't progress without it.
A typical example from LucasArts' Indiana Jones and the Last Crusade is where you drag your pointer over ten screenfulls of bookstacks to find the manual that will be of use much later in the game.
See also: Where's Waldo