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 6x6-1:
315 624
264 153
142 536
536 412
621 345
453 261

Level 6x6-2:
463 125
152 364
621 543
345 216
234 651
516 432

Level 6x6-3:
631 542
542 361
213 456
465 123
124 635
356 214