diff --git a/client/src/components/RoomsTable.vue b/client/src/components/RoomsTable.vue
index dc6d296..61d4aad 100644
--- a/client/src/components/RoomsTable.vue
+++ b/client/src/components/RoomsTable.vue
@@ -96,6 +96,27 @@
               >
                 📊 Details
               </button>
+              <div class="variant-selector-container">
+                <select 
+                  :value="room.metadata?.currentVariant || 'G1'"
+                  @change="$emit('changeVariant', room.roomId, ($event.target as HTMLSelectElement).value)"
+                  class="variant-select"
+                  title="Cambiar variante"
+                >
+                  <option value="G1">G1</option>
+                  <option value="G2">G2</option>
+                  <option value="G3">G3</option>
+                  <option value="G4">G4</option>
+                  <option value="G5">G5</option>
+                </select>
+              </div>
+              <button 
+                @click="$emit('closeRoom', room.roomId)"
+                class="btn btn-close"
+                title="Expulsar jugadores y cerrar sala"
+              >
+                🚪 Cerrar
+              </button>
             </td>
           </tr>
         </tbody>
@@ -145,6 +166,8 @@ const props = defineProps<{
 defineEmits<{
   refresh: [];
   viewRoomModal: [roomId: string];
+  closeRoom: [roomId: string];
+  changeVariant: [roomId: string, variant: string];
 }>();
 
 function getRoomDetails(roomId: string) {
@@ -243,6 +266,47 @@ function getReadableTextColor(hex?: string): string {
   transform: translateY(-1px);
 }
 
+.btn-close {
+  background: #f44336;
+  color: white;
+  padding: 6px 12px;
+  font-size: 12px;
+  margin-left: 4px;
+}
+
+.btn-close:hover {
+  background: #d32f2f;
+  transform: translateY(-1px);
+}
+
+.variant-selector-container {
+  display: inline-block;
+  margin: 0 4px;
+}
+
+.variant-select {
+  padding: 4px 8px;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  background: white;
+  font-size: 12px;
+  font-weight: 600;
+  color: #333;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.variant-select:hover {
+  border-color: #9c27b0;
+  background: #f8f9fa;
+}
+
+.variant-select:focus {
+  outline: none;
+  border-color: #9c27b0;
+  box-shadow: 0 0 0 2px rgba(156, 39, 176, 0.2);
+}
+
 .no-rooms {
   text-align: center;
   padding: 40px;
diff --git a/client/src/router/index.ts b/client/src/router/index.ts
index a2c3646..d141b37 100644
--- a/client/src/router/index.ts
+++ b/client/src/router/index.ts
@@ -3,6 +3,7 @@ import Lobby from '../views/Lobby.vue';
 import Game from '../views/Game.vue';
 import Dashboard from '../views/Dashboard.vue';
 import DemoGame from '../views/DemoGame.vue';
+import UuidSelector from '../views/UuidSelector.vue';
 
 const router = createRouter({
   history: createWebHistory(),
@@ -29,14 +30,13 @@ const router = createRouter({
     },
     {
       path: '/',
-      redirect: '/missing-uuid'
+      name: 'UuidSelector',
+      component: UuidSelector
     },
     {
-      // simple fallback for users hitting root without UUID
+      // Redirect old missing-uuid path to the new selector
       path: '/missing-uuid',
-      component: {
-        template: `<div style="padding:20px;font-family:sans-serif"><h2>Falta UUID</h2><p>Abre el juego escaneando tu código QR: snatchgame.nucleoriofrio.com/{uuid}</p></div>`
-      }
+      redirect: '/'
     }
   ]
 });
diff --git a/client/src/views/Dashboard.vue b/client/src/views/Dashboard.vue
index cd003ef..9980b81 100644
--- a/client/src/views/Dashboard.vue
+++ b/client/src/views/Dashboard.vue
@@ -37,6 +37,10 @@
             <option :value="2">2</option>
             <option :value="6">6</option>
             <option :value="10">10</option>
+            <option value="50-1">50 (Lote 1: UUIDs 1-50)</option>
+            <option value="50-2">50 (Lote 2: UUIDs 51-100)</option>
+            <option value="50-3">50 (Lote 3: UUIDs 101-150)</option>
+            <option value="50-4">50 (Lote 4: UUIDs 151-200)</option>
           </select>
           <template v-if="openCount === 1">
             <label>UUID:</label>
@@ -154,6 +158,8 @@
           :room-details="roomDetails"
           @refresh="fetchData"
           @view-room-modal="openRoomModal"
+          @close-room="closeRoom"
+          @change-variant="changeRoomVariant"
         />
         
         <!-- Cards View -->
@@ -238,7 +244,7 @@ const isLoadingGlobal = ref(false);
 
 // Open tabs UI state
 const allowedUuids = ref<string[]>([]);
-const openCount = ref<1|2|6|10>(1);
+const openCount = ref<1|2|6|10|'50-1'|'50-2'|'50-3'|'50-4'>(1);
 const selectedUuid = ref('');
 
 const gameRooms = computed(() => rooms.value.filter(r => r.name === 'game'));
@@ -248,14 +254,17 @@ const totalPlayers = computed(() => rooms.value.reduce((sum, room) => sum + room
 onMounted(async () => {
   // Try SSE first, fallback to polling if it fails
   initSSE();
-  // Load allowed UUIDs
+  // Load allowed UUIDs from API
   try {
-    const list = await colyseusService.fetchAllowedUuids();
-    allowedUuids.value = list || [];
+    const response = await fetch(`${import.meta.env.VITE_API_URL || 'http://localhost:3000/api'}/admin/uuids`);
+    const data = await response.json();
+    allowedUuids.value = data.uuids || [];
     if (!selectedUuid.value && allowedUuids.value.length > 0) {
       selectedUuid.value = allowedUuids.value[0];
     }
-  } catch {}
+  } catch {
+    console.error('Failed to load UUIDs from API');
+  }
 });
 
 onUnmounted(() => {
@@ -329,6 +338,43 @@ async function kickPlayer(roomId: string, playerId: string) {
   }
 }
 
+async function closeRoom(roomId: string) {
+  if (!confirm('¿Estás seguro de que quieres expulsar a todos los jugadores y cerrar esta sala?')) return;
+  
+  try {
+    const response = await fetch(`${import.meta.env.VITE_API_URL || 'http://localhost:3000/api'}/rooms/${roomId}/close`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' }
+    });
+    
+    if (!response.ok) throw new Error('Failed to close room');
+    
+    console.log(`Room ${roomId} closed successfully`);
+    await fetchData();
+  } catch (error) {
+    console.error('Failed to close room:', error);
+    alert('Failed to close room. Check console for details.');
+  }
+}
+
+async function changeRoomVariant(roomId: string, variant: string) {
+  try {
+    const response = await fetch(`${import.meta.env.VITE_API_URL || 'http://localhost:3000/api'}/rooms/${roomId}/variant`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ variant })
+    });
+    
+    if (!response.ok) throw new Error('Failed to change room variant');
+    
+    console.log(`Room ${roomId} variant changed to ${variant} successfully`);
+    await fetchData();
+  } catch (error) {
+    console.error('Failed to change room variant:', error);
+    alert('Failed to change room variant. Check console for details.');
+  }
+}
+
 
 function refreshData() {
   fetchData();
@@ -351,10 +397,24 @@ function openTabs() {
     return;
   }
 
-  // Randomly select N distinct UUIDs
-  const N = openCount.value as number;
   const pool = [...allowedUuids.value];
   if (pool.length === 0) return;
+
+  // Handle deterministic 50-UUID batches
+  if (typeof openCount.value === 'string' && openCount.value.startsWith('50-')) {
+    const batchNumber = parseInt(openCount.value.split('-')[1]);
+    const startIndex = (batchNumber - 1) * 50;
+    const endIndex = startIndex + 50;
+    const batchUuids = pool.slice(startIndex, Math.min(endIndex, pool.length));
+    
+    batchUuids.forEach(u => openOne(u));
+    return;
+  }
+
+  // For numeric counts, randomly select N distinct UUIDs
+  const N = openCount.value as number;
+  
+  // For other counts, use distinct UUIDs
   for (let i = pool.length - 1; i > 0; i--) {
     const j = Math.floor(Math.random() * (i + 1));
     [pool[i], pool[j]] = [pool[j], pool[i]];
diff --git a/client/src/views/UuidSelector.vue b/client/src/views/UuidSelector.vue
new file mode 100644
index 0000000..19754cd
--- /dev/null
+++ b/client/src/views/UuidSelector.vue
@@ -0,0 +1,381 @@
+<template>
+  <div class="uuid-selector-container">
+    <div class="selector-card">
+      <div class="header">
+        <h1 class="title">🎮 Snatch Game</h1>
+        <p class="subtitle">Selecciona tu UUID para continuar</p>
+      </div>
+
+      <div class="search-container">
+        <input
+          v-model="searchQuery"
+          type="text"
+          placeholder="Buscar UUID o nombre..."
+          class="search-input"
+          @input="filterUuids"
+        />
+        <span class="search-icon">🔍</span>
+      </div>
+
+      <div class="uuids-grid" v-if="!loading">
+        <div
+          v-for="(uuidInfo, index) in filteredUuids"
+          :key="uuidInfo.uuid"
+          class="uuid-card"
+          :class="{ 'has-name': uuidInfo.hasName }"
+          @click="selectUuid(uuidInfo.uuid)"
+          :style="{ animationDelay: `${index * 0.02}s` }"
+        >
+          <div class="uuid-number">{{ getUuidIndex(uuidInfo.uuid) }}</div>
+          <div v-if="uuidInfo.name" class="player-name">{{ uuidInfo.name }}</div>
+          <div class="uuid-text">{{ formatUuid(uuidInfo.uuid) }}</div>
+        </div>
+      </div>
+
+      <div v-else class="loading">
+        <div class="spinner"></div>
+        <p>Cargando UUIDs...</p>
+      </div>
+
+      <div class="quick-actions">
+        <button @click="selectRandom" class="btn-random">
+          🎲 Seleccionar Aleatorio
+        </button>
+        <button @click="goToDashboard" class="btn-dashboard">
+          🎛️ Dashboard Admin
+        </button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted } from 'vue';
+import { useRouter } from 'vue-router';
+
+interface UuidInfo {
+  uuid: string;
+  name: string | null;
+  hasName: boolean;
+}
+
+const router = useRouter();
+const loading = ref(true);
+const allUuids = ref<UuidInfo[]>([]);
+const searchQuery = ref('');
+const filteredUuids = ref<UuidInfo[]>([]);
+
+onMounted(async () => {
+  try {
+    const response = await fetch(`${import.meta.env.VITE_API_URL || 'http://localhost:3000/api'}/admin/uuids-with-names`);
+    const data = await response.json();
+    allUuids.value = data.uuids || [];
+    filteredUuids.value = allUuids.value; // Show all UUIDs
+  } catch (error) {
+    console.error('Failed to load UUIDs:', error);
+    allUuids.value = [];
+  } finally {
+    loading.value = false;
+  }
+});
+
+function filterUuids() {
+  const query = searchQuery.value.toLowerCase();
+  if (!query) {
+    filteredUuids.value = allUuids.value; // Show all when no search
+    return;
+  }
+
+  filteredUuids.value = allUuids.value.filter(uuidInfo => 
+    uuidInfo.uuid.toLowerCase().includes(query) || 
+    (uuidInfo.name && uuidInfo.name.toLowerCase().includes(query)) ||
+    getUuidIndex(uuidInfo.uuid).toString().includes(query)
+  );
+}
+
+function getUuidIndex(uuid: string): number {
+  return allUuids.value.findIndex(u => u.uuid === uuid) + 1;
+}
+
+function formatUuid(uuid: string): string {
+  // Show first 8 chars for better readability
+  return uuid.substring(0, 8) + '...';
+}
+
+function selectUuid(uuid: string) {
+  router.push(`/${uuid}`);
+}
+
+function selectRandom() {
+  if (allUuids.value.length > 0) {
+    const randomUuidInfo = allUuids.value[Math.floor(Math.random() * allUuids.value.length)];
+    selectUuid(randomUuidInfo.uuid);
+  }
+}
+
+function goToDashboard() {
+  router.push('/dashboard');
+}
+</script>
+
+<style scoped>
+.uuid-selector-container {
+  min-height: 100vh;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 20px;
+}
+
+.selector-card {
+  background: white;
+  border-radius: 20px;
+  padding: 40px;
+  max-width: 1200px;
+  width: 100%;
+  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
+  animation: slideUp 0.5s ease-out;
+}
+
+@keyframes slideUp {
+  from {
+    opacity: 0;
+    transform: translateY(30px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+.header {
+  text-align: center;
+  margin-bottom: 30px;
+}
+
+.title {
+  font-size: 3rem;
+  margin: 0;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  -webkit-background-clip: text;
+  background-clip: text;
+  -webkit-text-fill-color: transparent;
+  font-weight: bold;
+}
+
+.subtitle {
+  color: #666;
+  font-size: 1.2rem;
+  margin-top: 10px;
+}
+
+.search-container {
+  position: relative;
+  margin-bottom: 30px;
+}
+
+.search-input {
+  width: 100%;
+  padding: 15px 50px 15px 20px;
+  font-size: 16px;
+  border: 2px solid #e0e0e0;
+  border-radius: 12px;
+  transition: all 0.3s;
+  outline: none;
+}
+
+.search-input:focus {
+  border-color: #667eea;
+  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
+}
+
+.search-icon {
+  position: absolute;
+  right: 20px;
+  top: 50%;
+  transform: translateY(-50%);
+  font-size: 20px;
+  opacity: 0.6;
+}
+
+.uuids-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+  gap: 15px;
+  margin-bottom: 30px;
+  max-height: 500px;
+  overflow-y: auto;
+  padding: 10px;
+}
+
+.uuids-grid::-webkit-scrollbar {
+  width: 8px;
+}
+
+.uuids-grid::-webkit-scrollbar-track {
+  background: #f1f1f1;
+  border-radius: 10px;
+}
+
+.uuids-grid::-webkit-scrollbar-thumb {
+  background: #888;
+  border-radius: 10px;
+}
+
+.uuids-grid::-webkit-scrollbar-thumb:hover {
+  background: #555;
+}
+
+.uuid-card {
+  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
+  padding: 20px;
+  border-radius: 12px;
+  cursor: pointer;
+  transition: all 0.3s;
+  animation: fadeIn 0.5s ease-out backwards;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 10px;
+}
+
+@keyframes fadeIn {
+  from {
+    opacity: 0;
+    transform: scale(0.9);
+  }
+  to {
+    opacity: 1;
+    transform: scale(1);
+  }
+}
+
+.uuid-card:hover {
+  transform: translateY(-5px);
+  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+}
+
+.uuid-card:hover .uuid-number,
+.uuid-card:hover .uuid-text,
+.uuid-card:hover .player-name {
+  color: white;
+}
+
+.uuid-card.has-name {
+  background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
+  border: 2px solid rgba(102, 126, 234, 0.3);
+}
+
+.uuid-card.has-name:hover {
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  border-color: transparent;
+}
+
+.uuid-number {
+  font-size: 24px;
+  font-weight: bold;
+  color: #667eea;
+  transition: color 0.3s;
+}
+
+.player-name {
+  font-size: 16px;
+  font-weight: 600;
+  color: #333;
+  transition: color 0.3s;
+  padding: 4px 8px;
+  background: rgba(255, 255, 255, 0.5);
+  border-radius: 8px;
+  margin: 4px 0;
+}
+
+.uuid-text {
+  font-family: 'Monaco', 'Menlo', monospace;
+  font-size: 12px;
+  color: #666;
+  transition: color 0.3s;
+}
+
+.loading {
+  text-align: center;
+  padding: 60px;
+}
+
+.spinner {
+  width: 50px;
+  height: 50px;
+  border: 4px solid #f3f3f3;
+  border-top: 4px solid #667eea;
+  border-radius: 50%;
+  animation: spin 1s linear infinite;
+  margin: 0 auto 20px;
+}
+
+@keyframes spin {
+  0% { transform: rotate(0deg); }
+  100% { transform: rotate(360deg); }
+}
+
+.quick-actions {
+  display: flex;
+  gap: 15px;
+  justify-content: center;
+}
+
+.btn-random,
+.btn-dashboard {
+  padding: 12px 30px;
+  border: none;
+  border-radius: 10px;
+  font-size: 16px;
+  font-weight: 600;
+  cursor: pointer;
+  transition: all 0.3s;
+}
+
+.btn-random {
+  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+  color: white;
+}
+
+.btn-random:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 5px 15px rgba(240, 147, 251, 0.4);
+}
+
+.btn-dashboard {
+  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
+  color: white;
+}
+
+.btn-dashboard:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 5px 15px rgba(79, 172, 254, 0.4);
+}
+
+/* Responsive */
+@media (max-width: 768px) {
+  .selector-card {
+    padding: 20px;
+  }
+
+  .title {
+    font-size: 2rem;
+  }
+
+  .uuids-grid {
+    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
+  }
+
+  .quick-actions {
+    flex-direction: column;
+  }
+
+  .btn-random,
+  .btn-dashboard {
+    width: 100%;
+  }
+}
+</style>
\ No newline at end of file
diff --git a/server/src/adminApi.ts b/server/src/adminApi.ts
index ec94bb6..db0c512 100644
--- a/server/src/adminApi.ts
+++ b/server/src/adminApi.ts
@@ -114,6 +114,48 @@ adminRouter.post("/rooms/:roomId/kick/:playerId", async (req: Request, res: Resp
   }
 });
 
+adminRouter.post("/rooms/:roomId/close", async (req: Request, res: Response) => {
+  try {
+    const { roomId } = req.params;
+    const rooms = await matchMaker.query({ roomId });
+    
+    if (rooms.length === 0) {
+      return res.status(404).json({ error: "Room not found" });
+    }
+
+    await matchMaker.remoteRoomCall(roomId, "executeAdminCommand", ["sendToLobby"]);
+    
+    res.json({ success: true, message: `Room ${roomId} closed and players sent to lobby` });
+  } catch (error) {
+    console.error(`[AdminAPI] Error closing room ${req.params.roomId}:`, error);
+    res.status(500).json({ error: "Failed to close room" });
+  }
+});
+
+adminRouter.post("/rooms/:roomId/variant", async (req: Request, res: Response) => {
+  try {
+    const { roomId } = req.params;
+    const { variant } = req.body;
+    
+    if (!variant || !['G1', 'G2', 'G3', 'G4', 'G5'].includes(variant)) {
+      return res.status(400).json({ error: "Invalid variant. Must be one of: G1, G2, G3, G4, G5" });
+    }
+
+    const rooms = await matchMaker.query({ roomId });
+    
+    if (rooms.length === 0) {
+      return res.status(404).json({ error: "Room not found" });
+    }
+
+    await matchMaker.remoteRoomCall(roomId, "executeAdminCommand", ["setVariant", variant]);
+    
+    res.json({ success: true, message: `Room ${roomId} variant changed to ${variant}` });
+  } catch (error) {
+    console.error(`[AdminAPI] Error changing variant for room ${req.params.roomId}:`, error);
+    res.status(500).json({ error: "Failed to change room variant" });
+  }
+});
+
 adminRouter.get("/stats", async (req: Request, res: Response) => {
   try {
     const stats = await matchMaker.stats.fetchAll();
@@ -461,6 +503,28 @@ adminRouter.get("/admin/uuids", async (req: Request, res: Response) => {
   }
 });
 
+// UUID with names endpoint
+adminRouter.get("/admin/uuids-with-names", async (req: Request, res: Response) => {
+  try {
+    const uuids = listAllowedUuids();
+    const nameManager = NameManager.getInstance();
+    
+    const uuidsWithInfo = uuids.map(uuid => {
+      const name = nameManager.getPlayerName(uuid);
+      return {
+        uuid,
+        name: name || null,
+        hasName: !!name
+      };
+    });
+    
+    res.json({ uuids: uuidsWithInfo });
+  } catch (error) {
+    console.error("[AdminAPI] Error fetching UUIDs with names:", error);
+    res.status(500).json({ error: "Failed to fetch UUIDs with names" });
+  }
+});
+
 // SSE endpoint for real-time dashboard updates
 adminRouter.get("/dashboard-stream", (req: Request, res: Response) => {
   // Set SSE headers