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There is a bug in my previous submission, here it is again:

#Synopsis
#This is the solution to Ruby Quiz #108 described on
http://www.rubyquiz.com/quiz108.html.
#
#Usage
#   text_twist.rb dictionary_file
#
#Author
#   Chunyun Zhao(chunyun.zhao / gmail.com)
#
class Dictionary
  MIN_LEN, MAX_LEN  , 6
  attr_reader :max_letters
  def initialize(dict_file, minN_LEN, max
X_LEN)
    @min_len  in
    @max_len  ax
    @words  ash.new {|hash,key|hash[key]}
    File.foreach(dict_file) {|word|add_word(word.strip)}
    @max_letters  words.keys.select {|key| key.sizemax_len}
  end
  def word_list(letters)
    words
    permutate(letters).select {|letters|
      letters.size.between? @min_len, @max_len
    }.uniq.each {|key|
      words + words[key]
    }
    words.sort_by {|word| word.size}
  end
  private
  def add_word(word)
    if (@min_len..@max_len)word.size && word^[a-z]+$/i
      word.downcase!
      @words[word.split(//).sort] << word
    end
  end
  def permutate(letters)
    _letters  etters.dup
    result  ]
    while letter  letters.shift
      permutate(_letters).each do |perm|
        result << [letter] + perm
      end
      result << [letter]
    end
    result
  end
end

Task  truct.new(:letters, :words)

class GameUi
  def initialize(dict)
    @dictionary  ict
    @history_tasks  ]
    @rounds  
    @score  
  end

  def run
    while run_task
      answer  sk("\nProceed to next round?")
      break if answer !~ /^y/i
      @rounds + 
    end
    puts "\nYou've cleared #{cleared
leared?@rounds:@rounds-1} round#{'s'
if cleared > 1}, and your total score is #{@score}."
  end

  private
  def next_task
    letters  dictionary.max_letters[rand(@dictionary.max_letters.size)]
    retry if @history_tasks.include?(letters)
    task  ask.new(letters, @dictionary.word_list(letters))
    @history_tasks << task
    task
  end

  def run_task
    @task  ext_task
    @found  ]
    @cleared  alse
    puts "\nRound #{@rounds}. Letters: #{@task.letters*', '}. Hint: number
of matching words: #{@task.words.size}"
    while !(word ¨Â¨¢Åîôåùïõò ÷ïò亢©©®åíðôù      if @found.include? word
        puts "Word already found!"
      elsif @task.words.include? word
        @found << word
        @score + ord.size
        puts "Good job! You scored #{word.size} points!"
        if word.size @task.letters.size
          @cleared  rue
          puts "\nBingo! Round #@rounds cleared. You found #{@found.size}
word#{'s' if @found.size > 1}. "
          break
        end
      else
        puts "Wrong word!"
      end
    end
    puts "Missed words: #{(@task.words-@found)*', '}."
    @cleared
  end

  def ask question
    print question, " (Hit enter to exit)"
    gets.strip.downcase
  end
end
if __FILE__ $0
  if ARGV.size ! 
    puts "Usage: #{File.basename(__FILE__)} dictionary_file"
    exit
  end
  GameUi.new(Dictionary.new(ARGV.shift)).run
end

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