         when 13
           # ENTER
           @game.switch_scene('stage')
+          event.preventDefault()
         when 32
           # SPACE
           @toggle_players()
+          event.preventDefault()
 
   disable_selection_control: () ->
     $(document).unbind "keydown"

        when 13
          # ENTER
          if @running then @pause() else @rescue()
        when 27
          # ESC
          @game.reset()

  disable_controls: () ->
    if @map.p1_tank()

        @map.p1_tank().commander.add_key_event("keydown", event.which)
      if @map.p2_tank()
        @map.p2_tank().commander.add_key_event("keydown", event.which)
      event.preventDefault()
      false

  enable_system_control: () ->
