code: function(){
  		var cross = this.getcross();
  		if(cross.isnull || cross===this.mouseCell){ return;}
  
  		this.mouseCell = cross;
  
  		var xlist = new this.klass.CrossList([cross]);
  		if(this.puzzle.playmode){ xlist.ansclear();}
  		else                    { xlist.allclear();}
  
  		cross.draw();
  	}
docs: --------------------------------------------------------------------------- mv.inputclean_cross() Crossのqans(回答データ)を消去する ---------------------------------------------------------------------------