How to make a platform like the one in the Mario Party 9 ?

Hello! First of all excuse my bad english, it's not my language. I want to make a platform with a chain in the center like the one in Mario Party 9, here the link https://www.youtube.com/watch?v=TA2GkcXM9Xs. I have some idea with a Hinge Joint but nothing in concrete to achive the same effect. Thank you all.