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number_guess by solidstar 

number = rand(10000)
guess = ask "There is a number between 0 and 10000. What is it?"
guess = guess.to_f
while guess != number
  if guess > number
    guess = ask "That is too high. Try agian."
    guess = guess.to_f
  end
  if guess < number
    guess = ask "That is too low. Try again."
    guess = guess.to_f
  end
end
alert "Congratulations! The number was " + number.to_s + "."