DiffScale.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using TMPro;

public class DiffScale : MonoBehaviour
{
    public TMP_Text textshowed;
    // Start is called before the first frame update
    void Start()
    {
        Ui.motiv = 5f;
        Ui.difficulty = 0f;
        Ui.nbObst = 5;
    }

    // Update is called once per frame
    void Update()
    {
        float ech = Ui.difficulty/10;
        
        transform.localScale = new Vector3 (ech,1,1);

        if (Ui.difficulty < 0)
        {
            Ui.difficulty = 0;
        }

        if (Ui.nbObst < 0)
        {
            Ui.nbObst = 0;
        }

        textshowed = GameObject.Find("nbobstacle").GetComponent<TMP_Text>();
        textshowed.GetComponent<TMP_Text>().text = "Obstacles restants : " + Ui.nbObst.ToString();
    }
}