Blind soccer was developed in Spain in the 1920s. The rules are complicated, but they permit a spirited game with demanding challenges for athletes.
All of the players are blindfolded, except for the goalies and, for each time, a guide who stands behind the opposing team’s goal and shouts suggestions to the players. The ball makes a sound when it moves and players have to say “voy”, which is Spanish for “go” when moving toward the ball (or where they think the ball is).
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It would be interesting to see similar adaptive versions for other sports, such as stock car racing, paintball, and field hockey.
-via Amusing Planet