added a helper "ghost" to preview where Shape will land.

Author: altuntasfth

Assets/Scenes/Game.unity

@@ -323,6 +323,50 @@ CanvasRenderer:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 67693222}
   m_CullTransparentMesh: 0
+--- !u!1 &98321550
+GameObject:
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+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 98321552}
+  - component: {fileID: 98321551}
+  m_Layer: 0
+  m_Name: Ghost
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!114 &98321551
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+  m_PrefabInstance: {fileID: 0}
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+  m_Name: 
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+--- !u!4 &98321552
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+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
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+  m_RootOrder: 9
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Assets/Scripts/Core/Ghost.cs

@@ -0,0 +1,50 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Ghost : MonoBehaviour
+{
+    public Color m_color = new Color(1f, 1f, 1f, 0.2f);
+
+    private Shape m_ghostShape = null;
+    private bool m_hitBottom = false;
+
+    public void DrawGhost(Shape originalShape, Board gameBoard)
+    {
+        if (!m_ghostShape)
+        {
+            m_ghostShape = Instantiate(originalShape, originalShape.transform.position, originalShape.transform.rotation);
+            m_ghostShape.gameObject.name = "GhostShape";
+
+            SpriteRenderer[] allRenderers = m_ghostShape.GetComponentsInChildren<SpriteRenderer>();
+
+            foreach (var r in allRenderers)
+            {
+                r.color = m_color;
+            }
+        }
+        else
+        {
+            m_ghostShape.transform.position = originalShape.transform.position;
+            m_ghostShape.transform.rotation = originalShape.transform.rotation;
+        }
+
+        m_hitBottom = false;
+
+        while (!m_hitBottom)
+        {
+            m_ghostShape.MoveDown();
+
+            if (!gameBoard.IsValidPosition(m_ghostShape))
+            {
+                m_ghostShape.MoveUp();
+                m_hitBottom = true;
+            }
+        }
+    }
+
+    public void Reset()
+    {
+        Destroy(m_ghostShape.gameObject);
+    }
+}

Assets/Scripts/Core/Ghost.cs.meta

@@ -11,6 +11,7 @@ public class GameManager : MonoBehaviour
     private Shape m_aciveShape;
     private SoundManager m_soundManager;
     private ScoreManager m_scoreManager;
+    private Ghost m_ghost;
 
     private float m_timeToDrop;
     public float m_dropInterval = 0.9f;
@@ -56,6 +57,7 @@ void Start()
         m_spawner = GameObject.FindObjectOfType<Spawner>();
         m_soundManager = FindObjectOfType<SoundManager>();
         m_scoreManager = FindObjectOfType<ScoreManager>();
+        m_ghost = FindObjectOfType<Ghost>();
 
         if (!m_gameBoard)
         {
@@ -71,6 +73,11 @@ void Start()
         {
             Debug.LogWarning("WARNING: There is no score manager defined!");
         }
+        
+        if (!m_ghost)
+        {
+            Debug.LogWarning("WARNING: There is no ghost defined!");
+        }
 
         if (!m_spawner)
         {
@@ -110,6 +117,14 @@ void Update()
         PlayerInput();
     }
 
+    private void LateUpdate()
+    {
+        if (m_ghost)
+        {
+            m_ghost.DrawGhost(m_aciveShape, m_gameBoard);
+        }
+    }
+
     private void PlayerInput()
     {
         if ((Input.GetButton("MoveRight") && (Time.time > m_timeToNextKeyLeftRight)) || Input.GetButtonDown("MoveRight"))
@@ -203,6 +218,12 @@ private void LandShape()
 
         m_aciveShape.MoveUp();
         m_gameBoard.StoreShapeInGrid(m_aciveShape);
+
+        if (m_ghost)
+        {
+            m_ghost.Reset();
+        }
+        
         m_aciveShape = m_spawner.SpawnShape();
 
         m_gameBoard.ClearAllRows();