Time for action – it takes two to Tic Tac Toe

A one-playerTic Tac Toe game sounds like a recipe for a bad time. Let's get the O's in there to liven things up.

Add this line to the GameLogic script:

var XPiece:GameObject;
var OPiece:GameObject;
var currentPlayer:int = 1;

And later:

function ClickSquare(square:GameObject)
{
  var piece:GameObject;
  if(currentPlayer == 1)
  {
    piece = XPiece;
  } else {
    piece = OPiece;
  }

  Instantiate(piece, square.transform.position, Quaternion.identity);

  currentPlayer ++;
  if(currentPlayer > 2) currentPlayer = 1;
}

Try it out. Now when you click, the game alternates between X's and O's.


What just happened – alternating between players

Let's take a closer look at that code.

var currentPlayer:int = 1;

We begin the game with currentPlayer set to 1.

var piece:GameObject;
if(currentPlayer == 1)
{
  piece = XPiece;
} else {
  piece = OPiece;
}

This chunk of code defines a variable called piece. If currentPlayer is 1, it gets set to XPiece (which is defined...