The nodes drop

Assets/Prefabs/StackNode.prefab → Assets/Prefabs/Stack Node.prefab

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Assets/Prefabs/StackNode.prefab.meta → Assets/Prefabs/Stack Node.prefab.meta

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Assets/Scenes/SampleScene.unity

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@@ -915,5 +989,11 @@ PrefabInstance:
       propertyPath: m_Name
       value: Node Holder
       objectReference: {fileID: 0}
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+        type: 3}
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Assets/Scripts/General Purpose/Movable.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Movable : MonoBehaviour
+{
+    private Vector3 startPosition;
+    public Vector3 targetPosition { get; private set; }
+    private float time;
+    private float timeToReachTarget;
+
+    void Start()
+    {
+        startPosition = targetPosition = transform.position;
+    }
+
+    void Update()
+    {
+        time += Time.deltaTime / timeToReachTarget;
+        transform.position = Vector3.Lerp(startPosition, targetPosition, time);
+    }
+
+    public void SetDestination(Vector3 destination, float time)
+    {
+        this.time = 0;
+        startPosition = transform.position;
+        timeToReachTarget = time;
+        targetPosition = destination;
+    }
+}

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Assets/Scripts/Object Related/GameEvents.cs

+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class GameEvents : MonoBehaviour
+{
+    [HideInInspector] public static GameEvents instance;
+
+    private void Awake()
+    {
+        instance = this;
+    }
+
+    public event Action onHitEvent;
+
+    public void TriggerOnHitEvent()
+    {
+        onHitEvent?.Invoke();
+    }
+}

Assets/Scripts/Object Related/GameEvents.cs.meta

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Assets/Scripts/Object Related/Stack.cs

@@ -4,7 +4,7 @@ using UnityEngine;
 
 public class Stack : MonoBehaviour
 {
-    public int numberOfNodes;
+    [SerializeField] private int numberOfNodes;
     [HideInInspector] public int nodesLeft;
     
     private NodeHolder nodeHolder = null;
@@ -12,6 +12,12 @@ public class Stack : MonoBehaviour
     void Awake()
     {
         nodeHolder = gameObject.transform.GetChild(0).GetComponent<NodeHolder>();
+        refreshStack(numberOfNodes);
+    }
+
+    private void refreshStack(int nodeCount)
+    {
+        numberOfNodes = nodesLeft = nodeCount;
         nodeHolder.MakeNodes(numberOfNodes);
     }
 
@@ -19,10 +25,16 @@ public class Stack : MonoBehaviour
     {
         if (collision.gameObject.tag == "Cannonball")
         {
+            GameEvents.instance.TriggerOnHitEvent();
             // Destroy the last stack node
             Destroy(collision.gameObject);
             nodeHolder.RemoveBottomNode();
             nodesLeft--;
+
+            if(nodesLeft == 0)
+            {
+                refreshStack((int)(numberOfNodes * 1.5f));
+            }
         }
     }
 }

Assets/Scripts/Object Related/StackNode.cs

@@ -5,9 +5,33 @@ using UnityEngine;
 public class StackNode : MonoBehaviour
 {
     [SerializeField] private float rotationSpeed = 10f;
+    [SerializeField] private float descendTime = 0.2f;
+
+    private float descendDistance = 0.5f;
+    private Movable movable;
+
+    private void Awake()
+    {
+        movable = gameObject.GetComponent<Movable>();
+    }
+
+    void Start()
+    {
+        GameEvents.instance.onHitEvent += Descend;
+    }
 
     void FixedUpdate()
     {
         transform.localEulerAngles += new Vector3(0f, rotationSpeed * Time.fixedDeltaTime, 0f);
     }
+
+    private void Descend()
+    {
+        movable.SetDestination(movable.targetPosition - new Vector3(0f, descendDistance, 0f), descendTime);
+    }
+
+    private void OnDestroy()
+    {
+        GameEvents.instance.onHitEvent -= Descend;
+    }
 }