We discovered a game where players use blindfolds (or not, if blind).

At Parque La Carolina we stumbled upon a court where players were using blindfolds, except the one player who clearly is blind.   The game was played on an enclosed court and a referee officiated.   The object of the game is to roll a ball across the court to touch the opposite back wall below a certain height.   Each side of the perimeter of the court (and a line parallel to the back wall) is lined with string to allow the players to sense their location.   The ball has bells inside to enable the players to track its motion.    The play was vigorous and attracted a nice crowd.   See pictures below.  John