Who created the playing rules of baseball?

Answer 1

It's very difficult to say who actually created the playing rules. Abner Doubleday is usually credited with creating the basic rules of the game. As the game progressed, many rules have been changed or added by commissioners or requested by umpires or other officials. Even today rules still get changed or added (the instant replay for home runs).

There is a high possibility that Baseball was derived from a much older British game called Rounders.