Add key to allow quitting from the main game.

Assets/Scripts/tetrominoUserControl.cs

@@ -1,6 +1,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
+using UnityEngine.SceneManagement;
 
 public class tetrominoUserControl : MonoBehaviour
 {
@@ -53,6 +54,11 @@ public class tetrominoUserControl : MonoBehaviour
             activeTetromino.gameObject.transform.Rotate(0,0,-90,Space.World);
             GetComponent<AudioSource>().Play();
         }
+
+        if (Input.GetButtonDown("Quit"))
+        {
+            SceneManager.LoadScene("titleScreen");
+        }
     }
 
     public void setActiveTetromino(GameObject tetromino)

ProjectSettings/InputManager.asset

@@ -165,3 +165,19 @@ InputManager:
     type: 0
     axis: 0
     joyNum: 0
+  - serializedVersion: 3
+    m_Name: Quit
+    descriptiveName: 
+    descriptiveNegativeName: 
+    negativeButton: 
+    positiveButton: escape
+    altNegativeButton: 
+    altPositiveButton: 
+    gravity: 1000
+    dead: 0.001
+    sensitivity: 1000
+    snap: 0
+    invert: 0
+    type: 0
+    axis: 0
+    joyNum: 0