What game is it?

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Across
  1. 5. there are almost two trillion ways to win at this game and more than 700 million ways to tie
  2. 9. this was one of the first games to be made into a computer game in 1979
  3. 10. this game was patented by someone who created it to pass time during World War 2 air raids
Down
  1. 1. this game was created by a school teacher to brighten the day of children who were confined to a San Diego polio ward
  2. 2. this game was invented by a sophomore at the University of Illinois as part of a class assignment
  3. 3. this game's title comes from the way player's can hinder another player's progress
  4. 4. this game prints 30 times more money every year than the United States prints real money
  5. 6. this game was invented in India around the 6th century
  6. 7. this game is based on the Swahili word meaning "to build"
  7. 8. this game is one of the best-selling games of all time and has been translated into at least 20 languages