Snake game tail

Question

I am working at a 2D Snake Game in Unity. This is the head of the Snake: https://i.sstatic.net/MeelN.png And this is the Extension of the tail of the snake. It is added everytime I eat something: https://i.sstatic.net/IoagT.png I made the head of the snake to move, but my question is how do I move the extensions? I tried to add these extensions as childs to the head , but when i rotate the head, it rotates the all extensions at the same time, but I want to rotate one extension at a time like a chain. I am using a C# Script

if (position == 1 || position == 3) {
            if (Input.GetKey (KeyCode.UpArrow)) {
                position = 2;
                rotation=90;
                transform.rotation=Quaternion.Euler(0,0,rotation);

            } else if (Input.GetKey (KeyCode.DownArrow)) {
                position = 4;
                rotation=270;
                transform.rotation=Quaternion.Euler (0,0,rotation);
            }
        } else if (position == 2 || position == 4) {
            if(Input.GetKey(KeyCode.RightArrow)){
                position=1;
                rotation=0;
                transform.rotation=Quaternion.Euler (0,0,rotation);
            }
            else if(Input.GetKey(KeyCode.LeftArrow)){
                position=3;
                rotation=180;
                transform.rotation=Quaternion.Euler (0,0,rotation);
            }
        }
        if (position == 1)
            transform.Translate (Vector3.right * movementSpeed * Time.deltaTime,Space.World);
        else if (position == 2)
            transform.Translate (Vector3.up* movementSpeed * Time.deltaTime,Space.World);
        else if(position==3)
            transform.Translate(Vector3.left*movementSpeed*Time.deltaTime,Space.World);
        else if(position==4)
            transform.Translate (Vector3.down*movementSpeed*Time.deltaTime,Space.World);
        int i;
        for (i=1; i<extensions.Count; i++) {
            extensions[i].transform.position=extensions[i-1].transform.position;
            extensions[i].transform.rotation=extensions[i-1].transform.rotation;
        }

Answer 1

In unity, you will want to child all the segments (including the head) to an empty GameObject. Then you can move/rotate each child peice, including the head.

The way it works in the classic game is that only the head actually moves. The tail piece is removed from the end and a new segment is added where the head was last time. So only two segments are being moved each frame (head and tail). Not all segments.

Eg.
1. Move the head one space
2. Remove the tail piece
3. Fill in the space where the head was, with a new body/tail segment. Since you are removing the tail segment, you can reuse that GameObject for the new (neck) segment. Unless of course if you are using a unique segment for the tail piece. Then you would need to move 3 segments each frame.