Let $n>1$ be an even positive integer. An $2n \times 2n$ grid of unit squares is given, and it is partitioned into $n^2$ contiguous $2 \times 2$ blocks of unit squares. A subset $S$ of the unit squares satisfies the following properties:

(i) For any pair of squares $A,B$ in $S$, there is a sequence of squares in $S$ that starts with $A$, ends with $B$, and has any two consecutive elements sharing a side; and 

(ii) In each of the $2 \times 2$ blocks of squares, at least one of the four squares is in $S$. 

An example for $n=2$ is shown below, with the squares of $S$ shaded and the four $2 \times 2$ blocks of squares outlined in bold. 

[asy]
size(2.5cm);
fill((0,0)--(4,0)--(4,1)--(0,1)--cycle,mediumgrey);
fill((0,0)--(0,4)--(1,4)--(1,0)--cycle,mediumgrey);
fill((0,3)--(4,3)--(4,4)--(0,4)--cycle,mediumgrey);
fill((3,0)--(3,4)--(4,4)--(4,0)--cycle,mediumgrey);
draw((0,0)--(4,0)--(4,4)--(0,4)--cycle);
draw((1,0)--(1,4));
draw((2,0)--(2,4),linewidth(1));
draw((3,0)--(3,4));
draw((0,1)--(4,1));
draw((0,2)--(4,2),linewidth(1));
draw((0,3)--(4,3));
[/asy]

In terms of $n$, what is the minimum possible number of elements in $S$?
1. **Define the problem and constraints:**
   We are given a \(2n \times 2n\) grid of unit squares, partitioned into \(n^2\) contiguous \(2 \times 2\) blocks. We need to find the minimum number of elements in a subset \(S\) of the unit squares such that:
   - For any pair of squares \(A, B \in S\), there is a sequence of squares in \(S\) that starts with \(A\), ends with \(B\), and has any two consecutive elements sharing a side.
   - In each \(2 \times 2\) block, at least one of the four squares is in \(S\).

2. **Initial subset \(S_0\):**
   Consider a subset \(S_0 \subset S\) such that every \(2 \times 2\) block has exactly one element in \(S_0\). This ensures that \(S_0\) satisfies the second condition. The number of elements in \(S_0\) is \(n^2\).

3. **Connecting the elements in \(S_0\):**
   The elements of \(S_0\) in adjacent \(2 \times 2\) blocks cannot be connected directly. We need to add additional elements to \(S_0\) to ensure that all elements in \(S\) are connected, satisfying the first condition.

4. **Minimizing the number of additional elements:**
   To connect all the \(2 \times 2\) blocks, we need to add elements such that the number of additional elements is minimized. Each \(2 \times 2\) block can be connected to its adjacent blocks by adding one element in the shared side.

5. **Calculating the number of additional elements:**
   We need to connect \(n^2\) blocks. The minimum number of connections (edges) required to connect \(n^2\) blocks in a grid is \(n^2 - 1\). However, each connection can be made by adding one element in the shared side.

6. **Total number of elements in \(S\):**
   The total number of elements in \(S\) is the sum of the elements in \(S_0\) and the additional elements required to connect them. Therefore, the minimum number of elements in \(S\) is:
   \[
   n^2 + (n^2 - 1) = 2n^2 - 1
   \]

The final answer is \(\boxed{2n^2 - 1}\).