If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In this game you will find 2 identical(same) looking board. But there will be a single difference between 2 boards. You need to click on that difference to get points. Each time you click the right difference, you will get some points and boards get refreshed. Each wrong click reduces(less) some of your points. Game runs for a limited time and you need to earn maximum score in that time.
This game is played with the mouse only.