Sudocats

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/

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

Level 6x6-4:
564 321
132 465
316 542
425 136
253 614
641 253

Level 6x6-5:
643 215
215 463
132 654
456 132
364 521
521 346

Level 6x6-6:
643 521
512 463
361 254
254 316
426 135
135 642