Complete

FlappyBird/Assets/Scripts/Move.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Move : MonoBehaviour
+{
+    public float moveSpeed;
+    public float moveRange;
+    private GameObject obj;
+    private Vector3 oldPosition;
+    void Start()
+    {
+        obj = gameObject;
+        oldPosition = obj.transform.position;
+        moveSpeed = 5.0f;
+        moveRange = 20f;
+    }
+    void Update()
+    {
+        obj.transform.Translate(new Vector3(-Time.deltaTime * moveSpeed, 0, 0));
+        if (oldPosition.x - obj.transform.position.x > moveRange)
+        {
+            obj.transform.position = oldPosition;
+        }
+    }
+}