Starting with a $5 \times 5$ grid, choose a $4 \times 4$ square in it. Then, choose a $3 \times 3$ square in the $4 \times 4$ square, and a $2 \times 2$ square in the $3 \times 3$ square, and a $1 \times 1$ square in the $2 \times 2$ square. Assuming all squares chosen are made of unit squares inside the grid. In how many ways can the squares be chosen so that the final $1 \times 1$ square is the center of the original $5 \times 5$ grid?

[i]Proposed by Nancy Kuang[/i]
1. **Choosing the $4 \times 4$ square:**
   - The $5 \times 5$ grid has $2$ possible positions for the $4 \times 4$ square horizontally and $2$ possible positions vertically. Therefore, there are $2 \times 2 = 4$ ways to choose the $4 \times 4$ square.

2. **Choosing the $3 \times 3$ square within the $4 \times 4$ square:**
   - Each $4 \times 4$ square has $2$ possible positions for the $3 \times 3$ square horizontally and $2$ possible positions vertically. Therefore, there are $2 \times 2 = 4$ ways to choose the $3 \times 3$ square within any $4 \times 4$ square.

3. **Choosing the $2 \times 2$ square within the $3 \times 3$ square:**
   - Each $3 \times 3$ square has $2$ possible positions for the $2 \times 2$ square horizontally and $2$ possible positions vertically. Therefore, there are $2 \times 2 = 4$ ways to choose the $2 \times 2$ square within any $3 \times 3$ square.

4. **Choosing the $1 \times 1$ square within the $2 \times 2$ square:**
   - Each $2 \times 2$ square has $2$ possible positions for the $1 \times 1$ square horizontally and $2$ possible positions vertically. Therefore, there are $2 \times 2 = 4$ ways to choose the $1 \times 1$ square within any $2 \times 2$ square.

5. **Ensuring the final $1 \times 1$ square is the center of the $5 \times 5$ grid:**
   - The center of the $5 \times 5$ grid is the unit square at position $(3,3)$ (considering the grid is indexed from $(1,1)$ to $(5,5)$).
   - To ensure the final $1 \times 1$ square is at $(3,3)$, we need to backtrack from this position to ensure all previous squares are chosen correctly.

6. **Backtracking from the center:**
   - The $2 \times 2$ square containing $(3,3)$ must be centered at $(3,3)$. There is only $1$ such $2 \times 2$ square.
   - The $3 \times 3$ square containing this $2 \times 2$ square must also be centered at $(3,3)$. There is only $1$ such $3 \times 3$ square.
   - The $4 \times 4$ square containing this $3 \times 3$ square must also be centered at $(3,3)$. There is only $1$ such $4 \times 4$ square.

7. **Combining all choices:**
   - Since the choices for the $2 \times 2$, $3 \times 3$, and $4 \times 4$ squares are fixed to ensure the final $1 \times 1$ square is at $(3,3)$, there is only $1$ way to choose each of these squares.

Therefore, the total number of ways to choose the squares such that the final $1 \times 1$ square is the center of the original $5 \times 5$ grid is $\boxed{1}$.