public int findChange() {
        int totalSame = 0;
        for (int x = 0; x < 4; x++) {
            for (int y = 0; y < 4; y++) {
                if (grid[x][y] == next.grid[x][y]) {
                    totalSame++;
                }
            }
        }
        if (totalSame == 16) return -100;
        return 0;
    }