"tug of war"

sorry for all the questions today, but Im also trying to make something along the line of Tug of war...
My ideas so far are:

have a minecart with an invisible entity inside, 2 players use fishing rods to pull the minecart towards themselves on a straight rail line
have a custom rope (eg. made from chains), and a 3x3 grid, where on of the blocks is randomly a stone button... By pressing it, the rope moves by 1 block towards you, the button changes position

Does anyone have any other ideas? Ty!