1. Start the game by looking at the two images side by side. 2. Look carefully for the DIFFerences between the two images. 3. Click on the DIFFerences you find with your Mouse. 4. If you click on the wrong spot, you will lose Points. 5. If you find all the DIFFerences before the time runs out, you will get bonus Points. 6. Once you find all the DIFFerences, you will advance to the next level. 7. The game ends when you finish all the levels.