I have bought toys for my cats in the past and they never use them!
Sometimes they will chase a small ball if I roll it for them, but then once they get to the ball they just walk away. The only other toy they've ever really liked is a laser pointer. There's so many toys on the market for cats that look like a lot of fun, but my cats don't like to use them at all. Even if the toy involves catnip it doesn't seem to make a difference.
It seems to me the only game they like is chasing and wrestling with each-other, so I'm glad I have two because it seems like they'd be pretty bored if there was only one!