It seems to be my girl's favorite game. She's so fearless, she loves to run at ya, then away, be chased, stomped after (the stomping is required, it's how she knows the humans are cooperating with her invitation) Spins around, tail up, back up, mock attacks, runs, waits, runs again. Gets up on her tree, down and around again. She gets annoyed if you stop before she's done. I've never had a cat enjoy such a thing before?