Cooperative. You must do some task (maybe planting trees, growing stuff, whatever) together. The same set of tasks keeps repeating over and over.
Because … it’s a chain! You must execute the task again within a certain interval, otherwise you “break the chain”. If you’re too early, or too late, this has terrible consequences (you might even instantly lose).
As such, you have to really cooperate and communicate to determine who is going to do a certain action and when. You can’t stick to the same task all the time, because you’ll have to switch to another one that almost runs out.
(Maybe every player can only do the action a limited amount of time, and it takes effort to replenish resources/actions.)
This is a simple core concept that can really be applied to a wide variety of games. In fact, I think “don’t break the chain” is a great way to understand what makes games fun and challenging in the first place. Every good game gets you in that “flow” state by creating a chain of some kind you don’t want to break …