On levels 1, 3 and 5, you have 3 minutes to find the items in the bottom panel in each scene. You lose 5 seconds for each wrong click. Find all the items and level up. On levels 2 and 4, you have 3 minutes to find 10 differences between each of 2 similar scenes. You have 3 hints on every level if you get stuck. Have a great time searching for The Lost Golden Key Hidden Objects and differences, too!