I loved this game so much because it's one of the type of games I like the most since it's based on detail focus. It gave me some time in some levels since some differences were mere colour differences (in Tiger Wood there is a part of the sky that is dark blue and it's easy to miss it since the player is usually focused on finding smaller details) or just differences in designs, sometimes even smaller (i.e. Donkey Kong or House Wife). Other differences were plain visible before your eyes but they follow the principle of showing up to hide like in Buddy Building level.
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I liked the first and last musical tracks because they were the ones who helped me the most to stay focused. At the end I got a slight headache since I had to concentrate a lot to find them XD but I had fun. And to all people who are still struggling to find differences I prepared this image document that I share here as dump file (download it to see better and find them easily) to help you with the search, enjoy:
https://www.newgrounds.com/dump/item/e33695f546e093a1c55369fe0c1f2463
If you follow it you will kill two birds with one stone: you find all differences and don't make mistakes which allows you to get a 100 worthy point medal.
Only thing that sometimes can confuse the player is the presence of some glitches because some of the differences won't register if you click on the right side instead of the left.
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As always artworks and the witty word play is one of the elements I love the most about Munguia's games.