The objective in this game is simple. However, the game itself is not always easy. You need to be analytical and think critically to spot the differences between the two pictures you are looking at. Many of the differences can be very subtle which means you will be required to use as much effort as possible to be able to spot them. Some pictures have as many as ten differences in them, while others will only have five. When you click on a difference you see and you are correct, a red circle will appear. If you click on a perceived difference, but it turns out there is no difference, a red x will appear indicating a mistake in your judgment.