memory

bool PuzzleArea::hasPathToCenter(PuzzleArea *test, PuzzleArea *ignore)
{
    if (test != Q_NULLPTR) {
        for (PuzzleArea *n : test->neighbours) {
            if (n != Q_NULLPTR) {
                if (n->isCentral()) {
                    return true;
                }
                if (n->isPuzzle() && ignore != n) {
                    if (hasPathToCenter(n, ignore)) {
                        return true;
                    }
                }
            }
        }
    }
    return false;
}