Built out a simple level with some puzzles

Assets/Scripts/Respawner.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Respawner : MonoBehaviour {
+	public GameObject instance;
+	GameObject saved;
+	Vector3 startPos;
+
+	float timer = float.NegativeInfinity;
+	public float delay = 3f;
+
+	void Awake() {
+		//make a backup copy
+		saved = Instantiate (instance);
+		saved.SetActive (false);
+		startPos = instance.transform.position;
+	}
+
+	void FixedUpdate() {
+		//start the countdown
+		if (timer == float.NegativeInfinity && instance == null) {
+			timer = Time.time;
+		}
+
+		//stop the countdown
+		if (timer != float.NegativeInfinity && Time.time - timer >= delay) {
+			instance = Instantiate (saved);
+			instance.SetActive (true);
+			instance.transform.position = startPos;
+			timer = float.NegativeInfinity;
+		}
+	}
+}