From Webkinz Insider Wiki
The object of the game is to avoid the water, birds, and Zangoz while you make it through the level and collect a piece of the map.
Use the arrow keys to control Zacky.
You get the trophy after you have collected all 20 map pieces.
If you eat 50 pieces of fruit you will get an extra life.
According to the the WI High Score Board, the highest score achieved by a WebkinzInsider member in Zacky's Quest is 40,210 by member Hamlet.
More on this game can be found in this forum guide: