TicTacToe

using UnityEngine;

public class TicTacToe : MonoBehaviour {

    public TicTacToeCell cell;

    bool isPlayerTurnRed;
    bool inGame;

    private TicTacToeCell[,] cells;

    private void Start() {
        cells = new TicTacToeCell[3, 3];
        inGame = true;

        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                cells[i, j] = Instantiate(cell, new Vector3(i, j, 0), Quaternion.identity);
                cells[i, j].Init(this, i, j);
            }
        }
    }

    public void CellPressed(int x, int y) {
        if (!inGame) {
            return;
        }

        cells[x, y].Claim(isPlayerTurnRed);
        isPlayerTurnRed = !isPlayerTurnRed;

        int[] lines = new int[8];

        lines[0] = cells[0, 0].GetNumber() + cells[1, 0].GetNumber() + cells[2, 0].GetNumber();
        lines[1] = cells[0, 1].GetNumber() + cells[1, 1].GetNumber() + cells[2, 1].GetNumber();
        lines[2] = cells[0, 2].GetNumber() + cells[1, 2].GetNumber() + cells[2, 2].GetNumber();

        lines[3] = cells[0, 0].GetNumber() + cells[0, 1].GetNumber() + cells[0, 2].GetNumber();
        lines[4] = cells[1, 0].GetNumber() + cells[1, 1].GetNumber() + cells[1, 2].GetNumber();
        lines[5] = cells[2, 0].GetNumber() + cells[2, 1].GetNumber() + cells[2, 2].GetNumber();

        lines[6] = cells[0, 0].GetNumber() + cells[1, 1].GetNumber() + cells[2, 2].GetNumber();
        lines[7] = cells[2, 0].GetNumber() + cells[1, 1].GetNumber() + cells[0, 2].GetNumber();

        for (int i = 0; i < 8; i++) {
            if (lines[i] == 3) {
                Debug.Log("Red Player WIN!");
                inGame = false;
            } else if (lines[i] == -3) {
                Debug.Log("Green Player WIN!");
                inGame = false;
            }
        }

        if (!HasZero()) {
            Debug.Log("Tie!");
            inGame = false;
        }
    }

    private bool HasZero() {
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                if (cells[i, j].GetNumber() == 0) {
                    return true;
                }
            }
        }
        return false;
    }

    private void Update() {
        if (Input.GetKeyDown(KeyCode.R)) {
            for (int i = 0; i < 3; i++) {
                for (int j = 0; j < 3; j++) {
                    cells[i, j].Restart();
                    inGame = true;
                }
            }
        }
    }
}