City Differences Antwerp

This is another version of 'find the different' games, where you have to find the differences between two images. The images in this game focus on the locations within the city of Antwerp. The objective is to locate 10 differences between the image on the left and the image on the right. In order to locate the differences, you have to point your mouse cursor at a location on the right image which you think looks different from the corresponding location on the left image, then click on the left mouse button to mark it. If your choice is correct, a marker will appear on that location and you can resume to locate the rest of the difference. If you made a mistake, the remaining time within the timer will be reduced as penalty. After you passed a level, you will read the information about the location / building in the previous level and you will unlock the next level. For each level, you are given two hints which you can use if you believe that you are stuck. When you click on the hint, a soft green spot will be revealed and if you click on the green spot, the difference will be marked. There are 21 levels in total, can you unlock them all?