diff --git a/frontend/src/admin/components/NodeDetailDrawer.tsx b/frontend/src/admin/components/NodeDetailDrawer.tsx
index 0eaf2a6..ea6b974 100644
--- a/frontend/src/admin/components/NodeDetailDrawer.tsx
+++ b/frontend/src/admin/components/NodeDetailDrawer.tsx
@@ -13,6 +13,7 @@ type DrawerTab = 'basics' | 'location' | 'game' | 'messages' | 'advanced'
 
 type NodeDetailDrawerProps = {
   stage: AdminReactOverviewStage
+  stages?: AdminReactOverviewStage[]
   onClose: () => void
   onApplyLocal: (stage: AdminReactOverviewStage) => void
   onDeleteLocal: (stage: AdminReactOverviewStage) => void
@@ -31,8 +32,33 @@ function numberOrNull(value: string) {
   return Number.isFinite(parsed) ? parsed : null
 }
 
+function getPhysicalRequirementOption(stage: AdminReactOverviewStage) {
+  const record = stage as AdminReactOverviewStage & {
+    physical_node_kind?: string
+    physical_item_kind?: string
+    physical_item_id?: string
+    physical_item_label?: string
+    physical_qr?: { item_id?: string; label?: string; kind?: string }
+  }
+
+  const kind = record.physical_node_kind || record.physical_item_kind || record.physical_qr?.kind
+  const itemId = record.physical_item_id || record.physical_qr?.item_id
+  const label = record.physical_item_label || record.physical_qr?.label || stage.title || itemId
+
+  if (!itemId) return null
+  if (kind !== 'collectible' && kind !== 'requirement' && kind !== 'clue' && kind !== 'bonus') return null
+
+  return {
+    itemId,
+    label: label || itemId,
+    title: stage.title || label || itemId,
+    kind,
+  }
+}
+
 export default function NodeDetailDrawer({
   stage,
+  stages = [],
   onClose,
   onApplyLocal,
   onDeleteLocal,
@@ -60,6 +86,10 @@ export default function NodeDetailDrawer({
       ? (((draft as EditableAdminStage).config || {}) as Record<string, unknown>)
       : {}
 
+  const physicalRequirementOptions = stages
+    .map(getPhysicalRequirementOption)
+    .filter((item): item is NonNullable<ReturnType<typeof getPhysicalRequirementOption>> => Boolean(item))
+
   function getDraftConfigText(key: string, fallback = '') {
     const value = draftConfig[key]
     if (Array.isArray(value)) return value.join(', ')
@@ -448,6 +478,32 @@ export default function NodeDetailDrawer({
                 <span>{t('editor.gameAuthoring.completionHelp')}</span>
               </div>
 
+              <label className="admin-edit-field">
+                Physical QR item
+                <select
+                  value={getDraftConfigText('required_item_id')}
+                  onChange={(event) => {
+                    const selected = physicalRequirementOptions.find((item) => item.itemId === event.target.value)
+
+                    if (!selected) {
+                      updateDraftConfigText('required_item_id', '')
+                      updateDraftConfigText('required_item_label', '')
+                      return
+                    }
+
+                    updateDraftConfigText('required_item_id', selected.itemId)
+                    updateDraftConfigText('required_item_label', selected.label)
+                  }}
+                >
+                  <option value="">No physical item required</option>
+                  {physicalRequirementOptions.map((item) => (
+                    <option key={item.itemId} value={item.itemId}>
+                      {item.kind === 'collectible' ? '⭐' : item.kind === 'requirement' ? '🔒' : item.kind === 'clue' ? '🧩' : '🎁'} {item.label}
+                    </option>
+                  ))}
+                </select>
+              </label>
+
               <div className="admin-edit-grid">
                 <label className="admin-edit-field">
                   {t('editor.gameAuthoring.requiredItemId')}
diff --git a/frontend/src/player/PlayerApp.tsx b/frontend/src/player/PlayerApp.tsx
index 4f18052..cd7b2cc 100644
--- a/frontend/src/player/PlayerApp.tsx
+++ b/frontend/src/player/PlayerApp.tsx
@@ -1,6 +1,6 @@
 import { useEffect, useMemo, useRef, useState, type CSSProperties } from 'react'
 import { advancePlayer, fetchPlayerGame, fetchPublicConfig, fetchTeamStatus, sendHeartbeat } from '../shared/api'
-import type { PlayerGamePayload, PlayerGpsStatus, TeamProfileLiveStatus } from '../types/player'
+import type { PlayerGamePayload, PlayerGpsStatus, PlayerStage, TeamProfileLiveStatus } from '../types/player'
 import { PlayerShell } from './components/PlayerShell'
 import { PlayerHud } from './components/PlayerHud'
 import { QuickProofPanel } from './components/QuickProofPanel'
@@ -16,6 +16,7 @@ import { cachePlayerShell, registerPlayerServiceWorker } from './offline/pwaShel
 import { cacheTeamProfiles, getCachedTeamProfiles } from './offline/teamPresence'
 import { countVisibleTeamMarkers, teamProfilesToMapMarkers } from './offline/teamMapPresence'
 import { queueManualCode } from './offline/physicalEvents'
+import { loadInventorySnapshot } from './offline/inventory'
 import { getDistanceMeters } from './utils/geo'
 import { readStoredGpsPosition, rememberGpsPosition, rememberGpsReady, hasRememberedGpsReady } from './utils/gpsStorage'
 import { getCurrentStage, getPlayerPosition, getStagePosition, getStageRadius, normalizeGpsStatus } from './utils/stagePosition'
@@ -46,6 +47,48 @@ function getUserFromUrl(): string {
   return params.get('user') || 'PLAYER 1'
 }
 
+type ActiveItemRequirement = {
+  itemId: string
+  label: string
+  quantity: number
+  consume: boolean
+}
+
+function asRecord(value: unknown): Record<string, unknown> {
+  return value && typeof value === 'object' && !Array.isArray(value)
+    ? value as Record<string, unknown>
+    : {}
+}
+
+function readActiveItemRequirement(stage: PlayerStage | null): ActiveItemRequirement | null {
+  if (!stage) return null
+
+  const raw = asRecord(stage)
+  const requirements = asRecord(raw.requirements)
+  const items = Array.isArray(requirements.items) ? requirements.items : []
+  const first = asRecord(items[0])
+  const config = {
+    ...asRecord(raw.config),
+    ...asRecord(asRecord(raw.minigame).config),
+  }
+
+  const itemId = String(first.item_id || first.required_item_id || config.required_item_id || '').trim()
+  const label = String(first.label || first.required_item_label || config.required_item_label || itemId).trim()
+  const quantityRaw = first.quantity || first.required_item_quantity || config.required_item_quantity || 1
+  const quantity = Number.isFinite(Number(quantityRaw)) ? Math.max(1, Math.floor(Number(quantityRaw))) : 1
+  const consumeRaw = first.consume ?? first.required_item_consume ?? config.required_item_consume
+  const consume = consumeRaw === true || String(consumeRaw || '').toLowerCase() === 'true'
+
+  if (!itemId) return null
+  return { itemId, label: label || itemId, quantity, consume }
+}
+
+function countOwnedItems(user: string, itemId: string): number {
+  return loadInventorySnapshot(user).items
+    .filter((item) => item.item_id === itemId && item.state !== 'used')
+    .reduce((total, item) => total + Math.max(0, item.quantity || 0), 0)
+}
+
 export default function PlayerApp() {
   const [state, setState] = useState<LoadState>({ status: 'idle' })
   const [activePanel, setActivePanel] = useState<PlayerPanel>(null)
@@ -67,6 +110,7 @@ export default function PlayerApp() {
   const [offlineSummary, setOfflineSummary] = useState<OfflineMissionSummary | null>(null)
   const [browserGpsPosition, setBrowserGpsPosition] = useState<{ lat: number; lon: number } | null>(null)
   const [browserGpsStatus, setBrowserGpsStatus] = useState<PlayerGpsStatus>('unavailable')
+  const [inventoryRevision, setInventoryRevision] = useState(0)
 
   const noticeTimerRef = useRef<number | null>(null)
   const overlayTimerRef = useRef<number | null>(null)
@@ -78,6 +122,20 @@ export default function PlayerApp() {
   const isPhone =
     typeof window !== 'undefined' ? window.innerWidth <= 560 : false
 
+  useEffect(() => {
+    const handleInventoryUpdated = () => {
+      setInventoryRevision((current) => current + 1)
+    }
+
+    window.addEventListener('saga:inventory-updated', handleInventoryUpdated)
+    window.addEventListener('storage', handleInventoryUpdated)
+
+    return () => {
+      window.removeEventListener('saga:inventory-updated', handleInventoryUpdated)
+      window.removeEventListener('storage', handleInventoryUpdated)
+    }
+  }, [])
+
   useEffect(() => {
     const playerUrl = `/player/${encodeURIComponent(user)}`
     void registerPlayerServiceWorker()
@@ -357,8 +415,19 @@ export default function PlayerApp() {
     !browserGpsPosition &&
     !localDebugPosition
 
+  const activeRequirement = readActiveItemRequirement(currentStage)
+  const ownedRequirementQuantity = activeRequirement
+    ? countOwnedItems(payload.user, activeRequirement.itemId)
+    : 0
+  const missingRequiredItem = Boolean(
+    activeRequirement && ownedRequirementQuantity < activeRequirement.quantity
+  )
+  void inventoryRevision
+
   const hudHelperText =
-    gpsActionRequired
+    missingRequiredItem && activeRequirement
+      ? `Necesitas ${activeRequirement.quantity > 1 ? `${activeRequirement.quantity}× ` : ''}${activeRequirement.label}. Escanea su QR físico para guardarlo en Objetos.`
+      : gpsActionRequired
       ? 'Activa GPS para calcular distancia, centrarte en el mapa y entrar en el nodo cuando estés dentro del radio.'
       : runtime.helperText
 
@@ -379,7 +448,7 @@ export default function PlayerApp() {
   const hasOfflineMission = offlinePrepState === 'saved' || Boolean(offlineSummary?.hasPack)
   const hasBrowserGps = Boolean(browserGpsPosition)
   const primaryLabel = gpsActionRequired ? 'Activar GPS' : runtime.primaryLabel
-  const primaryDisabled = gpsActionRequired ? false : !runtime.canEnter
+  const primaryDisabled = gpsActionRequired ? false : missingRequiredItem || !runtime.canEnter
 
   async function refreshPayload() {
     const nextPayload = await fetchPlayerGame(user)
@@ -657,6 +726,12 @@ return
       return
     }
 
+    if (missingRequiredItem && activeRequirement) {
+      showNotice(`Necesitas ${activeRequirement.label}. Escanea su QR físico primero.`, 'warn')
+      vibrate([10, 16, 10])
+      return
+    }
+
     if (!runtime.canEnter) return
     setFocusRequest({ target: 'node', token: Date.now() })
     vibrate([10, 16, 10])
@@ -676,6 +751,11 @@ return
 
     setFocusRequest({ target: 'node', token: Date.now() })
 
+    if (missingRequiredItem && activeRequirement) {
+      showNotice(`Necesitas ${activeRequirement.label}. Escanea su QR físico primero.`, 'warn')
+      return
+    }
+
     if (runtime.canEnter) {
       showNotice('Target in range. Use Open Interaction.', 'info')
       return
diff --git a/frontend/src/player/components/QuickProofPanel.tsx b/frontend/src/player/components/QuickProofPanel.tsx
index e25c50c..d1a3c51 100644
--- a/frontend/src/player/components/QuickProofPanel.tsx
+++ b/frontend/src/player/components/QuickProofPanel.tsx
@@ -171,6 +171,14 @@ export function QuickProofPanel({ user, mobile, hidden }: QuickProofPanelProps)
       setMessage(`Guardado en Objetos. Tienes ${snapshot.items.length} tipo${snapshot.items.length === 1 ? '' : 's'} de objeto.`)
       setMode('idle')
       stopCamera()
+      window.dispatchEvent(new CustomEvent('saga:inventory-updated', {
+        detail: {
+          user,
+          item_id: parsed.item_id,
+          label: parsed.label,
+          source: 'qr',
+        },
+      }))
     } catch {
       setMessage('No se pudo guardar en este dispositivo. Usa Mochila > Respaldo.')
     }
diff --git a/frontend/src/types/player.ts b/frontend/src/types/player.ts
index 46734d7..49e54fe 100644
--- a/frontend/src/types/player.ts
+++ b/frontend/src/types/player.ts
@@ -32,6 +32,21 @@ export interface StageMessages {
   [key: string]: string | undefined
 }
 
+export interface StageItemRequirement {
+  item_id?: string
+  required_item_id?: string
+  label?: string
+  required_item_label?: string
+  quantity?: number
+  required_item_quantity?: number
+  consume?: boolean
+  required_item_consume?: boolean
+}
+
+export interface StageRequirements {
+  items?: StageItemRequirement[]
+}
+
 export interface StageConfig {
   [key: string]: unknown
 }
@@ -61,6 +76,7 @@ export interface PlayerStage {
   config?: StageConfig
   minigame?: StageMinigameRuntime
   entry?: StageEntryRules
+  requirements?: StageRequirements
   messages?: StageMessages
 }