Game of memory

writing a game of memory, stuck on how to freeze buttons once a match is
made any help would be appreciated. Yes, this is for school intro to
programming, my code isn't very eloquent.

require "fox16"
include Fox


class ClickButton < FXButton
  def initialize(parent, a, b, num)
    super(parent, nil, :width =>100, :height=>80, :x=>a, :y=>b,
:opts=>LAYOUT_FIX_WIDTH|LAYOUT_FIX_HEIGHT|FRAME_RAISED|FRAME_THICK|LAYOUT_FIX_X|LAYOUT_FIX_Y)
    @symbol = num


    self.connect(SEL_COMMAND) do
      self.parent.list(self)
      if self.parent.check == true
        self.text = @symbol
      end
    end
  end
end


class MemoryWindow < FXMainWindow
  def initialize(app_instance)
    super(app_instance,"Memory Game", :width => 400, :height => 320)

  @clicked_list=[]


  array1 = [1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8]
  array1=array1.shuffle

  num=array1.pop
  num=num.to_s
  @b1=ClickButton.new(self, 0, 0, num)
  num=array1.pop
  num=num.to_s
  @b2=ClickButton.new(self, 0, 80, num)
  num=array1.pop
  num=num.to_s
  @b3=ClickButton.new(self, 0, 160, num)
  num=array1.pop
  num=num.to_s
  @b4=ClickButton.new(self, 0, 240, num)
  num=array1.pop
  num=num.to_s
  @b5=ClickButton.new(self, 100, 0, num)
  num=array1.pop
  num=num.to_s
  @b6=ClickButton.new(self, 100, 80, num)
  num=array1.pop
  num=num.to_s
  @b7=ClickButton.new(self, 100, 160, num)
  num=array1.pop
  num=num.to_s
  @b8=ClickButton.new(self, 100, 240, num)
  num=array1.pop
  num=num.to_s
  @b9=ClickButton.new(self, 200, 0, num)
  num=array1.pop
  num=num.to_s
  @b10=ClickButton.new(self, 200, 80, num)
  num=array1.pop
  num=num.to_s
  @b11=ClickButton.new(self, 200, 160, num)
  num=array1.pop
  num=num.to_s
  @b12=ClickButton.new(self, 200, 240, num)
  num=array1.pop
  num=num.to_s
  @b13=ClickButton.new(self, 300, 0, num)
  num=array1.pop
  num=num.to_s
  @b14=ClickButton.new(self, 300, 80, num)
  num=array1.pop
  num=num.to_s
  @b15=ClickButton.new(self, 300, 160, num)
  num=array1.pop
  num=num.to_s
  @b16=ClickButton.new(self, 300, 240, num)
  num=array1.pop
  num=num.to_s


  end

  def list(some_button)
    @clicked_list << some_button
    puts @clicked_list.inspect
  end

  def check
    if @clicked_list.length > 2
      @clicked_list=[]
      @b1.text=nil
      @b2.text=nil
      @b3.text=nil
      @b4.text=nil
      @b5.text=nil
      @b6.text=nil
      @b7.text=nil
      @b8.text=nil
      @b9.text=nil
      @b10.text=nil
      @b11.text=nil
      @b12.text=nil
      @b13.text=nil
      @b14.text=nil
      @b15.text=nil
      @b16.text=nil
      return false

      else
        return true

    end
  end

  def create
    super
    self.show(PLACEMENT_SCREEN)
  end
end

app=FXApp.new
MemoryWindow.new(app)
app.create
app.run

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