Let $ n$ be a given positive integer. In the coordinate set, consider the set of points $ \{P_{1},P_{2},...,P_{4n\plus{}1}\}\equal{}\{(x,y)|x,y\in \mathbb{Z}, xy\equal{}0, |x|\le n, |y|\le n\}.$

Determine the minimum of $ (P_{1}P_{2})^{2} \plus{} (P_{2}P_{3})^{2} \plus{}...\plus{} (P_{4n}P_{4n\plus{}1})^{2} \plus{} (P_{4n\plus{}1}P_{1})^{2}.$
1. **Problem Restatement and Initial Setup:**
   We are given a set of points \( S = \{(x, y) \mid x, y \in \mathbb{Z}, xy = 0, |x| \le n, |y| \le n \} \) in the coordinate plane, where \( n \) is a positive integer. The set \( S \) contains \( 4n + 1 \) points. We need to determine the minimum value of the sum of the squares of the distances between consecutive points in a cycle that visits each point exactly once.

2. **Construction for Specific Values of \( n \):**
   - For \( n = 2 \), consider the points \( P_1, P_2, \ldots, P_9 \) as \((2, 0), (1, 0), (0, -2), (0, -1), (-2, 0), (-1, 0), (0, 1), (0, 2), (0, 0) \). The sum of the squares of the distances is \( 16 \cdot 2 - 8 = 24 \).
   - For \( n = 3 \), consider the points \( P_1, P_2, \ldots, P_{13} \) as \((3, 0), (1, 0), (0, 2), (0, 3), (0, 1), (-2, 0), (-3, 0), (-1, 0), (0, 0), (0, -2), (0, -3), (0, -1), (2, 0) \). The sum of the squares of the distances is \( 16 \cdot 3 - 8 = 40 \).

3. **General Construction for \( n \ge 2 \):**
   - Start by adding edges between the following pairs of vertices:
     \[
     \begin{align*}
     &((0, n), (0, n-1)), ((0, n), (0, n-2)), \\
     &((n, 0), (n-1, 0)), ((n, 0), (n-2, 0)), \\
     &((0, -n), (0, -(n-1))), ((0, -n), (0, -(n-2))), \\
     &((-n, 0), (-(n-1), 0)), ((-n, 0), (-(n-2), 0)).
     \end{align*}
     \]
     The sum of the squares of the lengths of these edges is \( 20 \).

   - For each \( 3 \le i < n \), add edges between the following pairs of vertices:
     \[
     \begin{align*}
     &((0, i), (0, i-2)), ((i, 0), (i-2, 0)), \\
     &((0, -i), (0, -(i-2))), ((-i, 0), (-(i-2), 0)).
     \end{align*}
     \]
     The sum of the squares of the lengths of these edges is \( 16 \), and so our total sum so far is \( 20 + (n-3) \cdot 16 = 16n - 28 \).

   - Finally, add edges between the following pairs of vertices:
     \[
     \begin{align*}
     &((-2, 0), (0, 1)), ((0, 2), (1, 0)), \\
     &((2, 0), (0, -1)), ((0, -2), (0, 0)), \\
     &((0, 0), (-1, 0)).
     \end{align*}
     \]
     The sum of the squares of these edges is \( 5 + 5 + 5 + 4 + 1 = 20 \), and so our grand total is \( 16n - 28 + 20 = 16n - 8 \).

4. **Proof of Optimality:**
   - We need to show that \( (P_1P_2)^2 + (P_2P_3)^2 + \cdots + (P_{4n}P_{4n+1})^2 + (P_{4n+1}P_1)^2 \ge 16n - 8 \) for any labeling of the points.
   - Let \( x_1, x_2, \ldots, x_{4n+1} \) be the \( x \)-coordinates of \( P_1, P_2, \ldots, P_{4n+1} \). We need to show:
     \[
     \sum_{i=1}^{4n+1} (x_i - x_{i+1})^2 \ge 8n - 4.
     \]
   - Let \( a_1, a_2, \ldots, a_t \) be the sequence obtained by compressing blocks of \( 0 \)'s into a single \( 0 \). Every nonzero number appears exactly once in \( a_1, a_2, \ldots, a_t \).
   - Assume \( a_1 = -n \) and \( a_b = n \). We can assume \( a_1, a_2, \ldots, a_b \) is strictly increasing and \( a_b, a_{b+1}, \ldots, a_t, a_1 \) is strictly decreasing.
   - Using the Cauchy-Schwarz Inequality:
     \[
     \sum_{i=1}^{b-1} (a_{i+1} - a_i)^2 \ge \frac{4n^2}{b-1}, \quad \sum_{i=b}^{t} (a_{t+1} - a_t)^2 \ge \frac{4n^2}{t+1-b}.
     \]
     Summing these:
     \[
     \sum_{i=1}^{t} (a_{i+1} - a_i)^2 \ge \frac{4n^2 t}{(b-1)(t+1-b)} \ge \frac{16n^2}{t}.
     \]
   - If \( t = 2n+1 \), then \( \frac{16n^2}{t} = \frac{16n^2}{2n+1} > 8n - 4 \).
   - If \( t = 2n+2 \), use the lemma for permutations of \([n]\):
     \[
     \sum_{i=1}^{n} (\sigma(i) - \sigma(i+1))^2 \ge 4n - 6.
     \]
     Summing the two resulting expressions:
     \[
     \sum_{i=1}^{t} (a_{i+1} - a_i)^2 \ge 4(n+1) - 6 + 4(n+1) - 6 = 8n - 4.
     \]

Thus, the minimum value of the sum of the squares of the distances is \( 16n - 8 \).

The final answer is \( \boxed{ 16n - 8 } \).