Find and click on the five differences between the two photos before time runs out to advance to the next level. There are five levels. You can click on either pic, but you pretty much have to hit the differences dead center to score.
Game has a lot of graphics.
So be patient. It should load in about 90 seconds at 56k. You can toggle the sounds on and off by clicking on Options - a good idea if you have a slow connection or want to conserve memory.