Spot the difference in 10 pictures!
3 chances per level.
Must also be quick.

For the other 2 achievements:
Kitty:
Turn off the in game Music
Click on the cat when it's purring

KuKo:
Click on the KuKo button in the bottom left

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For my other guides, they are here:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2880052179