Spot the Difference is a very interesting puzzle game that you can play on games501 for free. Your aim is to find the differences between two pictures with the help of lens. You will gain 100 points with one right click and lose 100 points with a wrong click. Each click in the last 50 seconds will gain only 10 points for you. The time is limited and very short, so accomplish it as quickly as possible. This flash game is a nice way to practice your eyes.
