LadderZone.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class LadderZone : MonoBehaviour
{

    private PlayerController thePlayer;
    // Start is called before the first frame update
    void Start()
    {
        thePlayer = FindObjectOfType<PlayerController>();//Get player with player controller script attached
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.name == "Player")
        {
            thePlayer.onLadder = true;
        }
    }

    void OnTriggerExit2D(Collider2D other)
    {
        if (other.name == "Player")
        {
            thePlayer.onLadder = false;
        }
    }

    /*// Update is called once per frame
    void Update()
    {

    }*/
}