Game

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Game : MonoBehaviour {

    public bool redPlayerTurn = true;
    bool inGame = true;

    public List<Cell> cells;

    Cell[,] board;

    void Start() {
        board = new Cell[3,3];
        foreach (Cell c in cells)
            board[c.position.x,c.position.y] = c;
    }

    public void Update() {
        if (Input.GetKeyDown(KeyCode.R) && !inGame) {
            inGame = true;
            foreach (Cell c in cells)
                c.SetValue(0);
        }
    }

    public void Click(Vector2Int pos) {
        Debug.Log(pos);
        if (inGame) {
            if (board[pos.x, pos.y].GetValue() == 0) {
                board[pos.x, pos.y].SetValue(redPlayerTurn ? 1 : -1);

                CheckGameOver();
            }
        }
    }

    void CheckGameOver() {
        int[] boardInfo = new int[8];

        boardInfo[0] = board[0,0].GetValue() + board[1,0].GetValue() + board[2,0].GetValue();
        boardInfo[1] = board[0,1].GetValue() + board[1,1].GetValue() + board[2,1].GetValue();
        boardInfo[2] = board[0,2].GetValue() + board[1,2].GetValue() + board[2,2].GetValue();

        boardInfo[3] = board[0,0].GetValue() + board[0,1].GetValue() + board[0,2].GetValue();
        boardInfo[4] = board[1,0].GetValue() + board[1,1].GetValue() + board[1,2].GetValue();
        boardInfo[5] = board[2,0].GetValue() + board[2,1].GetValue() + board[2,2].GetValue();

        boardInfo[6] = board[0,0].GetValue() + board[1,1].GetValue() + board[2,2].GetValue();
        boardInfo[7] = board[0,2].GetValue() + board[1,1].GetValue() + board[2,0].GetValue();

        for (int i = 0; i < 8; i++)
            if (boardInfo[i] == 3) {
                GameOver("Red player Win!");
                return;
            } else if (boardInfo[i] == -3) {
                GameOver("Blue player Win!");
                return;
            }

        CheckDraw();
    }

    void CheckDraw() {
        for (int x = 0; x < 3; x++)
            for (int y = 0; y < 3; y++)
                if (board[x,y].GetValue() == 0) {
                    redPlayerTurn = !redPlayerTurn;
                    return;
                }

        GameOver("Draw!");
    }

    void GameOver(string message) {
        inGame = false;
        Debug.Log(message);
    }
}