They were actually really simple since I used Unity but needed a bit of fiddling. I attached every chain link, the player and the ball with spring joints and after messing with the configuration of both the joints and the rigidbodies I got them to a point which I liked, even though the chains can stretch a bit. I usually work as a programmer and this game had a surprisingly low amount of code. That helped so that I could do more of the other stuff, especially since it was my first time making audio.