CodeBreaker

#!/usr/bin/env ruby
# Codebreaker by Solomon Wise is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.
# http://creativecommons.org/licenses/by-nc-sa/3.0/us/
# Details: 
  # Text Editors Used:
    # cmd edit
    # Komodo Edit
  # Languages Used:
    # Ruby 1.9.3
      # 1.9.3-p125
  # Operating Systems Used:
    # Windows 7
    # Mac OS X Lion
  # Date First Build Finished:
    # April 22, 2012
    # 3:55 P.M.
# Base class for the sequence
begin
  system("clear")
rescue
  system("cls")
end
class Sequence
  def exc code, str
    puts str, code
    exit code
  end
  def initialize
    # Logs difficulty level
    puts "Type the difficulty level you would like: 1, 2, 3, 4, or 5"
    @level = gets; @level = @level.to_i
    # Exits if level is more than 6
    if @level > 6
      sexit 1, "Invalid Difficulty"
    end
  end
  def create_code
    # Creates the code randomly
    rnum = Random.new
    @code = rnum.rand(1000...@level*2000).to_s
    if @level == 5
      # Adds an extra digit to make it more difficult
      @code += "#{rand(10)}"
    end
    # Exits program if @level is a string
    if @code.length > 5 
      sexit 1, "Invalid Difficulty"
    end
  end
  def prompt
    @retstring = ""
    # Sets number of guesses
    guesses = 0
    while guesses < 4
      print "Enter a guess: "
      @guess = gets
      # Iterates over the code, matching it with the guess
      @code.length.times do |x|
        if @code[x] == @guess[x]
          @retstring += "+"
        else
          @retstring += "-"
        end
        puts @retstring
        sleep(1)
        x += 1
      end
      # Prompts user for hint
      puts "Would you like a hint? Type 'hint' to get a hint"
      hint = gets
      # Matches hint to RegEx
      match = hint =~ /(h|H)(i|I)(n|N)\w/
      unless match == nil
        # Gives hint if the match is true
        j = rand(@level*2)
        puts "#{@code[j]} is in the code"
      end
      guesses += 1
      # Prints correct if the user gets the code right
      if @retstring == "++++"
        puts "Correct!"
        break
      end
      @retstring = ""
    end
  end
  def print_code
    # Prints the code
    print "#{@code} was the code"
  end
end
seq = Sequence.new
seq.create_code
seq.prompt
seq.print_code