Chạy đua với thời gian

using UnityEngine;

public class Ball : MonoBehaviour
{
    public float force = 10f;
    public int score;
    private Rigidbody rb;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
    }

    void FixedUpdate()
    {
        float x = Input.GetAxis("Horizontal");
        float z = Input.GetAxis("Vertical");
        rb.AddForce(new Vector3(x, 0f, z) * force);
    }

    public void AddScore(int points)
    {
        score += points;
        Debug.Log("Score: " + score);
    }
}