An equilateral triangle with side length $3$ is divided into $9$ congruent triangular cells as shown in the figure below. Initially all the cells contain $0$. A [i]move[/i] consists of selecting two adjacent cells (i.e., cells sharing a common boundary) and either increasing or decreasing the numbers in both the cells by $1$ simultaneously. Determine all positive integers $n$ such that after performing several such moves one can obtain $9$ consecutive numbers $n,(n+1),\cdots ,(n+8)$ in some order. 
[asy] size(3cm);
pair A=(0,0),D=(1,0),B,C,E,F,G,H,I;
G=rotate(60,A)*D;
B=(1/3)*D; C=2*B;I=(1/3)*G;H=2*I;E=C+I-A;F=H+B-A;
draw(A--D--G--A^^B--F--H--C--E--I--B,black);[/asy]
1. **Initial Setup and Parity Argument:**
   - Consider an equilateral triangle with side length 3, divided into 9 smaller congruent equilateral triangles.
   - Initially, all cells contain the number 0.
   - A move consists of selecting two adjacent cells and either increasing or decreasing the numbers in both cells by 1 simultaneously.
   - We need to determine all positive integers \( n \) such that after several moves, the cells can contain the numbers \( n, n+1, \ldots, n+8 \) in some order.

2. **Parity Argument for \( n = 1 \):**
   - If \( n = 1 \), the numbers to be placed in the cells are \( 1, 2, \ldots, 9 \).
   - The sum of these numbers is \( 1 + 2 + \cdots + 9 = 45 \), which is odd.
   - Initially, the sum of all numbers in the cells is \( 0 \), which is even.
   - Each move changes the sum of the numbers in the cells by \( 0 \) (since we add and subtract the same amount).
   - Therefore, it is impossible to reach an odd sum from an even sum using the allowed moves.
   - Hence, \( n = 1 \) is not possible.

3. **Checking \( n = 2 \):**
   - If \( n = 2 \), the numbers to be placed in the cells are \( 2, 3, \ldots, 10 \).
   - The sum of these numbers is \( 2 + 3 + \cdots + 10 = 54 \), which is even.
   - Since the initial sum is \( 0 \) (even), it is possible to reach an even sum using the allowed moves.
   - Therefore, \( n = 2 \) is a potential solution.

4. **General Case for \( n > 2 \):**
   - Suppose \( n > 2 \) and we want to place the numbers \( n, n+1, \ldots, n+8 \) in the cells.
   - Label the cells as \( 1, 2, \ldots, 9 \) in some fixed order.
   - Color cells \( 2, 4, 7 \) in black and the remaining cells \( 1, 3, 5, 6, 8, 9 \) in white.
   - Let \( S_{2,4,7} \) be the sum of the numbers in the black cells and \( S_{1,3,5,6,8,9} \) be the sum of the numbers in the white cells.
   - Initially, \( S_{2,4,7} = 0 \) and \( S_{1,3,5,6,8,9} = 0 \).
   - After any move, the sums \( S_{2,4,7} \) and \( S_{1,3,5,6,8,9} \) remain equal because each move affects both sums equally.
   - When the cells contain \( n, n+1, \ldots, n+8 \), the total sum is \( 9n + 36 \).
   - The sum of the numbers in the black cells \( S_{2,4,7} \) is at most \( (n+8) + (n+7) + (n+6) = 3n + 21 \).
   - The sum of the numbers in the white cells \( S_{1,3,5,6,8,9} \) is at least \( n + (n+1) + (n+2) + (n+3) + (n+4) + (n+5) = 6n + 15 \).
   - Therefore, \( S_{1,3,5,6,8,9} \geq 6n + 15 \) and \( S_{2,4,7} \leq 3n + 21 \).
   - For the sums to be equal, \( 6n + 15 \leq 3n + 21 \), which simplifies to \( 3n \leq 6 \) or \( n \leq 2 \).
   - Since \( n > 2 \) is assumed, this leads to a contradiction.

5. **Conclusion:**
   - The only possible value for \( n \) is \( n = 2 \).

The final answer is \( \boxed{ n = 2 } \).