I have one snowshoe-loooking cat, Rulfo, who specializes on hacking those things. He's got three models, each more advanced than the previous one. He always finds a way to get more food out of them.

Oh, we also tried dispenser balls that would drop kibbles with the cats making some exercise trying to get them out of the ball. After a week, Rulfo was like Messi. He would not touch the limits of a 1 squared ft before getting them all out while my orange cat would act as if he was some kind of unicorn trying to pinch the ball... aaah, fun times.