text: document.body.onkeydown = function( e ) {
      var keys = {
          37: 'left',
          39: 'right',
          40: 'down',
          38: 'rotate'
      };
      if ( typeof keys[ e.keyCode ] != 'undefined' ) {
          keyPress( keys[ e.keyCode ] );
          render();
      }
  };
  