How do you make a mouse sensitivity option?

So i've been spending a really long time trying to figure this out but whenever I put in the mouseSensativity = PlayerPrefs.GetInt("Sensativity") part the screen only allows player one to look up and down and player two cant even look at all. Here's player one's script:

using UnityEngine; using System.Collections; [RequireComponent (typeof(CharacterController))] public class FPScontroller : MonoBehaviour { public float movementSpeed = 5.0f; public float jumpSpeed = 7.0f; public float sprintSpeed = 2.0f; public int mouseSensativity; float verticalRotation = 0; public float upDownRange = 60.0f; float verticalVelocity = 0; CharacterController characterController; // Use this for initialization void Start () { Screen.lockCursor = true; characterController = GetComponent<CharacterController>(); mouseSensativity = PlayerPrefs.GetInt("Sensativity"); } // Update is called once per frame void Update () { //Rotation float rotLeftRight = Input.GetAxis("Mouse X") * mouseSensativity; transform.Rotate(0, rotLeftRight, 0); verticalRotation -= Input.GetAxis("Mouse Y") * mouseSensativity; verticalRotation = Mathf.Clamp(verticalRotation, -upDownRange, upDownRange); Camera.main.transform.localRotation = Quaternion.Euler(verticalRotation, 0, 0); //Movement float forwardSpeed = Input.GetAxis("Vertical1") * movementSpeed; float sideSpeed = Input.GetAxis("Horizontal1") * movementSpeed; if (Input.GetButton("Run2")) { forwardSpeed = Input.GetAxis("Vertical1") * movementSpeed * sprintSpeed; sideSpeed = Input.GetAxis("Horizontal1") * movementSpeed * sprintSpeed; } if (!Input.GetButton("Run2")) { forwardSpeed = Input.GetAxis("Vertical1") * movementSpeed; sideSpeed = Input.GetAxis("Horizontal1") * movementSpeed; } verticalVelocity += Physics.gravity.y * Time.deltaTime * 2; if (characterController.isGrounded && Input.GetButtonDown("Jump2")) { verticalVelocity = jumpSpeed; } Vector3 speed = new Vector3(sideSpeed, verticalVelocity, forwardSpeed); speed = transform.rotation * speed; characterController.Move(speed * Time.deltaTime); } } here's player two's script (it's pretty much the same thing):

 using UnityEngine;
 using System.Collections;
 
 [RequireComponent(typeof(CharacterController))]
 public class FPScontrollerp2 : MonoBehaviour
 {
 
     public float movementSpeed = 5.0f;
     public int mouseSensativity;
     public float jumpSpeed = 7.0f;
     public float sprintSpeed = 2.0f;
 
     float verticalRotation = 0;
     public float upDownRange = 60.0f;
 
     float verticalVelocity = 0;
 
     CharacterController characterController;
 
     // Use this for initialization
     void Start()
     {
         Screen.lockCursor = true;
         characterController = GetComponent<CharacterController>();
 
         mouseSensativity = PlayerPrefs.GetInt("Sensativity");
     }
 
     // Update is called once per frame
     void Update()
     {
 
 
         //Rotation        
 
         float rotLeftRight = Input.GetAxis("Mouse X") * mouseSensativity;
         transform.Rotate(0, rotLeftRight, 0);
 
         verticalRotation -= Input.GetAxis("Mouse Y") * mouseSensativity;
         verticalRotation = Mathf.Clamp(verticalRotation, -upDownRange, upDownRange);
         Camera.main.transform.localRotation = Quaternion.Euler(verticalRotation, 0, 0);
 
         //Movement
         float forwardSpeed = Input.GetAxis("Vertical2") * movementSpeed;
         float sideSpeed = Input.GetAxis("Horizontal2") * movementSpeed;
 
         if (Input.GetButton("Run"))
         {
             forwardSpeed = Input.GetAxis("Vertical2") * movementSpeed * sprintSpeed;
             sideSpeed = Input.GetAxis("Horizontal2") * movementSpeed * sprintSpeed;
         }
         if (!Input.GetButton("Run"))
         {
             forwardSpeed = Input.GetAxis("Vertical2") * movementSpeed;
             sideSpeed = Input.GetAxis("Horizontal2") * movementSpeed;
         }
 
         verticalVelocity += Physics.gravity.y * Time.deltaTime * 2;
 
         if (characterController.isGrounded && Input.GetButtonDown("Jump"))
         {
             verticalVelocity = jumpSpeed;
         }
 
         Vector3 speed = new Vector3(sideSpeed, verticalVelocity, forwardSpeed);
 
         speed = transform.rotation * speed;
 
         characterController.Move(speed * Time.deltaTime);
     }
 }
 

and here's the options script that they're both pulling from:

 using UnityEngine;
 using System.Collections;
 
 public class OptionTextBehaviour : MonoBehaviour
 {
 
     public bool isMainMenu = false;
     public bool isOne = false;
     public bool isTwo = false;
     public bool isThree = false;
     public bool isFour = false;
     public bool isFive = false;
     public bool isSix = false;
     public bool isSeven = false;
     public bool isEight = false;
     public bool isNine = false;
     public bool isTen = false;
     bool Clicked = false;
 
     public int Sensativity;
     
 
 
     void OnMouseEnter()
     {
         renderer.material.color = Color.red;
     }
 
     void OnMouseExit()
     {
         if (!Clicked)
         {
             renderer.material.color = Color.white;
         }
     }
 
 
     void OnMouseUp()
     {
         if (isMainMenu)
         {
             Application.LoadLevel(0);
         }
         if (isOne)
         {
             Sensativity = 10;
             Clicked = true;
         }
         if (isTwo)
         {
             Sensativity = 20;
             Clicked = true;
         }
         if (isThree)
         {
             Sensativity = 30;
         }
         if (isFour)
         {
             Sensativity = 40;
         }
         if (isFive)
         {
             Sensativity = 50;
         }
         if (isSix)
         {
             Sensativity = 60;
         }
         if (isSeven)
         {
             Sensativity = 70;
         }
         if (isEight)
         {
             Sensativity = 80;
         }
         if (isNine)
         {
             Sensativity = 90;
         }
         if (isTen)
         {
             Sensativity = 100;
         }
         PlayerPrefs.SetInt("Sensativity", Sensativity);
     }
 }

also as a side note, i'm trying to make it to where whenever a number is clicked it turns red and stays red, but when another # is clicked it turns white, but it stays red no matter what once it's clicked and i've tried many different things but nothing is fixing it and i assume that's because each number runs on its own script, so it can't tell when another number is clicked, but I am new at this and don't know how to fix it. I know it's a lot but help would be very much appreciated. Thanks!