Untitled

using UnityEngine;

public class PlayerMovement : MonoBehaviour {
    public CharacterController controller;
    public float speed = 12f;
    public float gravity = -9.81f;
    public float jumpHeight = 3f;

    Vector3 velocity;
    bool isGrounded;

    void Update() {
        // Basic movement logic
        float x = Input.GetAxis("Horizontal");
        float z = Input.GetAxis("Vertical");
        Vector3 move = transform.right * x + transform.forward * z;
        controller.Move(move * speed * Time.deltaTime);

        // Gravity/Jumping
        if (Input.GetButtonDown("Jump") && isGrounded) {
            velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
        }
        velocity.y += gravity * Time.deltaTime;
        controller.Move(velocity * Time.deltaTime);
    }
}