Sudocats

Change it to numbers by pressing and then selecting the circle with number 1, then

Level 6x6-7:
426 135
153 246
361 452
542 613
234 561
615 324

Level 6x6-8:
456 321
312 465
164 532
523 146
231 654
645 213

Level 6x6-9:
521 463
463 251
135 624
246 315
614 532
352 146

If you're struggling to complete the sudoku, I'd suggest turning on the number mode as this will turn the cats into numbers and make the puzzles easier to understand for some people.

Or, you can use the following website and input the numbers that are seen to reveal the rest of the formation :

https://www.sudoku-solutions.com/