They’re great games!
COIN stands for COunter INsurgency. Each of the games are 4 players, and they are card drive war games. But the way the cards work is there is an event on it. The person’s whose turn it is can either execute the event, or they can choose a unique ability they have for their faction. And whatever this player chooses, affects what the next person can do.
For example, say Player 1 executes the event. Now Player 2 can only pass or choose one other their unique operations.
It probably sounds really complex, but it’s really not. Each faction has a unique win condition and asymmetrical abilities. Lots of fun!
Check out a review video of Cuba Libre sometime!