new_contents: var Game = function(boardString){
    this.board = '';
    if (arguments.length === 1) {
      this.board = boardString;
    } else {
      function random() {
        return Math.floor(Math.random() * 10 + 6);
      };
      var firstTwo = random();
      var secondTwo = random();
      for ( var i = 0; i < 16; i++ ) {
        if (i === firstTwo || i === secondTwo) {
          this.board += '2';
        } else {
          this.board += '0';
        };
      };
    }
  };
  
  Game.prototype.toString = function() {
    this.board.
  };
  
subject: Create board in Game constructor