GuessingGame working in my Terminal, but not working in Socrates. I looked through the Specs, but could not find anything wrong.

gistfile1.rb

class GuessingGame
  def initialize(guess)
    @guess = guess
  end
  
  def guess(last_guess) # passing from last_guess = gets.chomp
    @last_guess = last_guess
    if    @last_guess  > @guess
      return :high
    elsif @last_guess  < @guess
      return :low
    elsif @last_guess == @guess
      return :correct
    end
  end
  
  def solved?
    if @last_guess == @guess 
      true
    else
      false
    end
  end
end

answer = 1 + rand(10)
game = GuessingGame.new(answer)
last_guess  = nil
last_result = nil

until game.solved?
  unless last_guess.nil?
    puts "Oops!  Your last guess (#{last_guess}) was #{last_result}."
    puts ""
  end
  print "Guess a number between 1 and 10, inclusive."
    last_guess =  gets.chomp.to_i
    last_result = game.guess(last_guess)
end

puts "#{last_guess} was correct!"