Cat toys suggestions | Are there any cat toys made for "co-op?

Our two cats will sometimes play by one grabbing a cat dancer or string toy and dragging it around while the other follows, so you could try that sort of toy where it's all attached but they can each have their own piece of string to grab.

The other way our cats will play together is one will get up on the dining table and start knocking shit off the table for the other to play with... But that's not really our preferred method.

Our cats are siblings/bonded pair so your milage may vary. They also sometimes just chase each other which is fun for them too I guess.