My two loved..anything that rustled, and anything you could chase around, anything they could hide in and ambush unsuspecting other black kitties from. So, we have a sheet of newspaper on the floor. Under it, the pretend mouse, which got a twitch whenever a black kitty went near it. The pretend mouse bulge got jumped on smartly..but theres no satisfaction in chewing through paper..so these two learned to stick front paws through at a rate of knots, thrash around, and hope the competition didn’t catch aforesaid pretend mouse first. So..no luck..all quiet..black kitty looking around for the next twitch..which was never too far away in coming. A cardboard box with a hole in it, through which a black paw would fit, was great fun. Even better if the box was upside down on one kitty..so he could move the whole kit and caboodle around…the two of them had a great time, one inside, the other outside the said box.,