Create invisible blocking tile

Assets/Prefabs/Blocked Tile.prefab

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+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!1001 &100100000
+Prefab:
+  m_ObjectHideFlags: 1
+  serializedVersion: 2
+  m_Modification:
+    m_TransformParent: {fileID: 0}
+    m_Modifications: []
+    m_RemovedComponents: []
+  m_SourcePrefab: {fileID: 0}
+  m_RootGameObject: {fileID: 1968639828739124}
+  m_IsPrefabAsset: 1
+--- !u!1 &1968639828739124
+GameObject:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 100100000}
+  serializedVersion: 6
+  m_Component:
+  - component: {fileID: 4746883435089378}
+  - component: {fileID: 61960220535560086}
+  m_Layer: 0
+  m_Name: Blocked Tile
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
+--- !u!4 &4746883435089378
+Transform:
+  m_ObjectHideFlags: 1
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 100100000}
+  m_GameObject: {fileID: 1968639828739124}
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 1.8, y: 1.09, z: 0}
+  m_LocalScale: {x: 1, y: 1, z: 1}
+  m_Children: []
+  m_Father: {fileID: 0}
+  m_RootOrder: 0
+  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!61 &61960220535560086
+BoxCollider2D:
+  m_ObjectHideFlags: 1
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 100100000}
+  m_GameObject: {fileID: 1968639828739124}
+  m_Enabled: 1
+  m_Density: 1
+  m_Material: {fileID: 0}
+  m_IsTrigger: 0
+  m_UsedByEffector: 0
+  m_UsedByComposite: 0
+  m_Offset: {x: 0, y: 0}
+  m_SpriteTilingProperty:
+    border: {x: 0, y: 0, z: 0, w: 0}
+    pivot: {x: 0.5, y: 0.5}
+    oldSize: {x: 1, y: 1}
+    newSize: {x: 1, y: 1}
+    adaptiveTilingThreshold: 0.5
+    drawMode: 0
+    adaptiveTiling: 0
+  m_AutoTiling: 0
+  serializedVersion: 2
+  m_Size: {x: 1, y: 1}
+  m_EdgeRadius: 0

Assets/Prefabs/Blocked Tile.prefab.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 128643c2b03b40c448a423ec8b814f63
+NativeFormatImporter:
+  externalObjects: {}
+  mainObjectFileID: 100100000
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: