Chutes and Ladders
Chutes and Ladders simulator in Ruby that outputs a histogram of turns it takes to win.
Multithreaded speedup supported with
--threads N option in JRuby or Rubinius. The standard MRI you will so no speedup with multiple threads due to the Global Interpreter Lock (GIL).
ruby chutes_and_ladders.rb --help Usage: chutes_and_ladders.rb [options] -g, --games GAMES Number of games to simulate  -t, --threads THREADS Number of Threads to use  --max-turns TURNS Max number of turns to let a game go for  -h, --help Show this message
Ethan Markowitz and his article analyzing chutes and ladder: http://ethanmarkowitz.com/index.php/2015/05/24/hacking-chutes-and-ladders-using-r/