My cat Bisk is easy to amuse, just make sure you have your attention on her at all times and nowhere else, lol.
She likes her catnip bubbles, her laser dot, anything that makes noise, and of course, her favorite amusement, destroying all our toilet paper, including the rolls in the closet.

Bow and Arrow, our budgies, prefer to amuse eachother and spend most of the day chasing eachother around the room, but they also enjoy getting spray millet

Puck(Hedgehog) is happiest when he can run around the house by himself, sniffing and chewing and chasing Bisk, regular hedgehog stuff.

And Plug (Also Hedgehog) Prefers to just sleep all the time. So i gotta make him exercise.