If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
There are five pairs interesting pictures. Each pair has five mystery differences. Some of them are easy to find it, but how you go in every next picture it is harder to find it. Your job is to find that differences before time runs out. You have time of 60 seconds for each pair. Use mouse to click when you finds some differences.
This game is played with mouse only.