diff --git a/apps/editor/app/viewer/[id]/page.tsx b/apps/editor/app/viewer/[id]/page.tsx
index 30b0cf08..c8144adb 100644
--- a/apps/editor/app/viewer/[id]/page.tsx
+++ b/apps/editor/app/viewer/[id]/page.tsx
@@ -5,6 +5,7 @@ import { Viewer } from '@pascal-app/viewer'
 import { OrbitControls } from '@react-three/drei'
 import { useParams } from 'next/navigation'
 import { useEffect, useState } from 'react'
+import { ViewerOverlay } from './viewer-overlay'
 
 export default function ViewerPage() {
   const params = useParams()
@@ -52,7 +53,8 @@ export default function ViewerPage() {
   }
 
   return (
-    <div className="h-screen w-full">
+    <div className="relative h-screen w-full">
+      <ViewerOverlay />
       <Viewer>
         <OrbitControls makeDefault />
       </Viewer>
diff --git a/apps/editor/app/viewer/[id]/viewer-overlay.tsx b/apps/editor/app/viewer/[id]/viewer-overlay.tsx
new file mode 100644
index 00000000..c8856fbc
--- /dev/null
+++ b/apps/editor/app/viewer/[id]/viewer-overlay.tsx
@@ -0,0 +1,128 @@
+'use client'
+
+import { type AnyNode, type BuildingNode, type LevelNode, type ZoneNode, useScene } from '@pascal-app/core'
+import { useViewer } from '@pascal-app/viewer'
+import { ChevronRight } from 'lucide-react'
+
+const getNodeName = (node: AnyNode): string => {
+  if ('name' in node && node.name) return node.name
+  if (node.type === 'wall') return 'Wall'
+  if (node.type === 'item') return (node as { asset: { name: string } }).asset?.name || 'Item'
+  if (node.type === 'slab') return 'Slab'
+  if (node.type === 'ceiling') return 'Ceiling'
+  if (node.type === 'roof') return 'Roof'
+  return node.type
+}
+
+export const ViewerOverlay = () => {
+  const selection = useViewer((s) => s.selection)
+  const nodes = useScene((s) => s.nodes)
+
+  const building = selection.buildingId ? (nodes[selection.buildingId] as BuildingNode | undefined) : null
+  const level = selection.levelId ? (nodes[selection.levelId] as LevelNode | undefined) : null
+  const zone = selection.zoneId ? (nodes[selection.zoneId] as ZoneNode | undefined) : null
+
+  // Get the first selected item (if any)
+  const selectedNode = selection.selectedIds.length > 0
+    ? (nodes[selection.selectedIds[0]!] as AnyNode | undefined)
+    : null
+
+  // Get all levels for the selected building
+  const levels = building?.children
+    .map((id) => nodes[id] as LevelNode | undefined)
+    .filter((n): n is LevelNode => n?.type === 'level')
+    .sort((a, b) => a.level - b.level) ?? []
+
+  const handleLevelClick = (levelId: string) => {
+    // When switching levels, deselect zone and items
+    useViewer.getState().setSelection({ levelId })
+  }
+
+  const handleBreadcrumbClick = (depth: 'root' | 'building' | 'level' | 'zone') => {
+    switch (depth) {
+      case 'root':
+        useViewer.getState().resetSelection()
+        break
+      case 'building':
+        useViewer.getState().setSelection({ levelId: null })
+        break
+      case 'level':
+        useViewer.getState().setSelection({ zoneId: null })
+        break
+    }
+  }
+
+  return (
+    <div className="absolute top-4 left-4 z-10 flex flex-col gap-3">
+      {/* Breadcrumb */}
+      <div className="flex items-center gap-1 text-sm">
+        <button
+          onClick={() => handleBreadcrumbClick('root')}
+          className="text-neutral-500 hover:text-neutral-800 transition-colors"
+        >
+          Site
+        </button>
+
+        {building && (
+          <>
+            <ChevronRight className="w-4 h-4 text-neutral-400" />
+            <button
+              onClick={() => handleBreadcrumbClick('building')}
+              className={`transition-colors ${level ? 'text-neutral-500 hover:text-neutral-800' : 'text-neutral-800 font-medium'}`}
+            >
+              {building.name || 'Building'}
+            </button>
+          </>
+        )}
+
+        {level && (
+          <>
+            <ChevronRight className="w-4 h-4 text-neutral-400" />
+            <button
+              onClick={() => handleBreadcrumbClick('level')}
+              className={`transition-colors ${zone ? 'text-neutral-500 hover:text-neutral-800' : 'text-neutral-800 font-medium'}`}
+            >
+              {level.name || `Level ${level.level}`}
+            </button>
+          </>
+        )}
+
+        {zone && (
+          <>
+            <ChevronRight className="w-4 h-4 text-neutral-400" />
+            <span className={`transition-colors ${selectedNode ? 'text-neutral-500' : 'text-neutral-800 font-medium'}`}>
+              {zone.name}
+            </span>
+          </>
+        )}
+
+        {selectedNode && zone && (
+          <>
+            <ChevronRight className="w-4 h-4 text-neutral-400" />
+            <span className="text-neutral-800 font-medium">{getNodeName(selectedNode)}</span>
+          </>
+        )}
+      </div>
+
+      {/* Level List (only when building is selected) */}
+      {building && levels.length > 0 && (
+        <div className="flex flex-col gap-1 bg-white/80 backdrop-blur-sm rounded-lg p-2 shadow-sm border border-neutral-200 w-40">
+          <span className="text-xs text-neutral-500 px-2 pb-1">Levels</span>
+          {levels.map((lvl) => (
+            <button
+              key={lvl.id}
+              onClick={() => handleLevelClick(lvl.id)}
+              className={`text-left px-2 py-1 rounded text-sm transition-colors ${
+                lvl.id === selection.levelId
+                  ? 'bg-blue-500 text-white'
+                  : 'text-neutral-700 hover:bg-neutral-100'
+              }`}
+            >
+              {lvl.name || `Level ${lvl.level}`}
+            </button>
+          ))}
+        </div>
+      )}
+    </div>
+  )
+}
diff --git a/packages/viewer/src/components/viewer/index.tsx b/packages/viewer/src/components/viewer/index.tsx
index 09954fb8..14687e9c 100644
--- a/packages/viewer/src/components/viewer/index.tsx
+++ b/packages/viewer/src/components/viewer/index.tsx
@@ -26,38 +26,38 @@ interface ViewerProps {
 const Viewer: React.FC<ViewerProps> = ({ children, selectionManager = 'default' }) => {
   return (
     <Canvas
-      className={'bg-[#303035]'}
-      gl={async (props) => {
-        const renderer = new THREE.WebGPURenderer(props as any)
-        await renderer.init()
-        return renderer
-      }}
-      shadows
-      camera={{ position: [50, 50, 50], fov: 50 }}
-    >
-      <color attach="background" args={['#ececec']} />
-      <ViewerCamera />
+        className={'bg-[#303035]'}
+        gl={async (props) => {
+          const renderer = new THREE.WebGPURenderer(props as any)
+          await renderer.init()
+          return renderer
+        }}
+        shadows
+        camera={{ position: [50, 50, 50], fov: 50 }}
+      >
+        <color attach="background" args={['#ececec']} />
+        <ViewerCamera />
 
-      <directionalLight position={[10, 10, 5]} intensity={0.5} castShadow />
-      <Environment preset="sunset" environmentIntensity={0.3} />
-      <Bvh>
-        <SceneRenderer />
-      </Bvh>
+        <directionalLight position={[10, 10, 5]} intensity={0.5} castShadow />
+        <Environment preset="sunset" environmentIntensity={0.3} />
+        <Bvh>
+          <SceneRenderer />
+        </Bvh>
 
-      {/* Default Systems */}
-      <LevelSystem />
-      <GuideSystem />
-      <ScanSystem />
-      {/* Core systems */}
-      <CeilingSystem />
-      <ItemSystem />
-      <RoofSystem />
-      <SlabSystem />
-      <WallSystem />
-      <PostProcessing />
+        {/* Default Systems */}
+        <LevelSystem />
+        <GuideSystem />
+        <ScanSystem />
+        {/* Core systems */}
+        <CeilingSystem />
+        <ItemSystem />
+        <RoofSystem />
+        <SlabSystem />
+        <WallSystem />
+        <PostProcessing />
 
-      {selectionManager === 'default' && <SelectionManager />}
-      {children}
+        {selectionManager === 'default' && <SelectionManager />}
+        {children}
     </Canvas>
   )
 }
diff --git a/packages/viewer/src/components/viewer/selection-manager.tsx b/packages/viewer/src/components/viewer/selection-manager.tsx
index e6dd2128..8f2a79f7 100644
--- a/packages/viewer/src/components/viewer/selection-manager.tsx
+++ b/packages/viewer/src/components/viewer/selection-manager.tsx
@@ -111,14 +111,26 @@ const getStrategy = (): SelectionStrategy | null => {
     }
   }
 
-  // Zone selected -> can hover contents (walls, items, slabs, ceilings, roofs)
+  // Zone selected -> can select/hover contents (walls, items, slabs, ceilings, roofs)
   return {
     types: ['wall', 'item', 'slab', 'ceiling', 'roof'],
-    handleClick: () => {
-      // No action on click at zone content level
+    handleClick: (node) => {
+      const { selectedIds } = useViewer.getState().selection
+      // Toggle selection - if already selected, deselect; otherwise select
+      if (selectedIds.includes(node.id)) {
+        useViewer.getState().setSelection({ selectedIds: selectedIds.filter((id) => id !== node.id) })
+      } else {
+        useViewer.getState().setSelection({ selectedIds: [node.id] })
+      }
     },
     handleDeselect: () => {
-      useViewer.getState().setSelection({ zoneId: null })
+      const { selectedIds } = useViewer.getState().selection
+      // If items are selected, deselect them first; otherwise go back to level
+      if (selectedIds.length > 0) {
+        useViewer.getState().setSelection({ selectedIds: [] })
+      } else {
+        useViewer.getState().setSelection({ zoneId: null })
+      }
     },
     isValid: (node) => {
       const validTypes = ['wall', 'item', 'slab', 'ceiling', 'roof']
@@ -222,12 +234,17 @@ const PointerMissedHandler = ({ clickHandledRef }: { clickHandledRef: React.Muta
 }
 
 const OutlinerSync = () => {
+  const selection = useViewer((s) => s.selection)
   const hoveredId = useViewer((s) => s.hoveredId)
   const outliner = useViewer((s) => s.outliner)
 
   useEffect(() => {
-    // Clear selected objects - we only show hover in viewer
+    // Sync selected objects
     outliner.selectedObjects.length = 0
+    for (const id of selection.selectedIds) {
+      const obj = sceneRegistry.nodes.get(id)
+      if (obj) outliner.selectedObjects.push(obj)
+    }
 
     // Sync hovered objects
     outliner.hoveredObjects.length = 0
@@ -235,7 +252,7 @@ const OutlinerSync = () => {
       const obj = sceneRegistry.nodes.get(hoveredId)
       if (obj) outliner.hoveredObjects.push(obj)
     }
-  }, [hoveredId, outliner])
+  }, [selection, hoveredId, outliner])
 
   return null
 }