The easiest way to complete the game is using the autocomplete function from the own game.
At the top right of every puzzle, there will be this check icon circled in the image below.
Just click and the puzzle will be solved.



Or you can use your brain to finish by yourself. If you don't want to use the auto-complete option and still need some extra help, use the gallery images from the other guides as reference.

Whichever way you go, you'll be rewarded with one achievement for completing a level from a total of twelve for each Neko.

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