Two similar images are displayed. Inspect them to find the differences. Click the spot on either image where you think they are different. You will gain time if you are correct, but be careful, you'll lose time if you're wrong. If you don't mark all the differences within the time limit, your game will end.
If you get stuck, click on the "Hint" button at the bottom of the screen to find one of the differences. You only get three hints per game, and it does not reward points or extra time.
 "Game Screenshot")
