Cats are wonderful creatures but you better not put them together without proper introduction. So, plan ahead to display them in the right order so they get along!When you adopt a cat and there is(are) other(s) cat(s) already living in the house, you need to make a gradual introduction first. Sudocats can be handy in that matter!• Relaxing experience• Classic sudoku with cats• 4x4, 6x6 and 9x9 puzzles• Customizable grid/background• You can change cats/numbers anytime