diff --git a/client/src/views/DemoGame.vue b/client/src/views/DemoGame.vue
index 1222fd1..641fe51 100644
--- a/client/src/views/DemoGame.vue
+++ b/client/src/views/DemoGame.vue
@@ -55,6 +55,8 @@
         </div>
       </div>
 
+      <ChatWidget />
+
       <div class="game-footer">
         <button @click="leaveGame" class="btn btn-leave">Leave Game</button>
       </div>
@@ -73,6 +75,7 @@ import G2 from './games/G2.vue';
 import G3 from './games/G3.vue';
 import G4 from './games/G4.vue';
 import G5 from './games/G5.vue';
+import ChatWidget from './games/ChatWidget.vue';
 
 const router = useRouter();
 
diff --git a/client/src/views/games/ChatWidget.vue b/client/src/views/games/ChatWidget.vue
new file mode 100644
index 0000000..90ecd9e
--- /dev/null
+++ b/client/src/views/games/ChatWidget.vue
@@ -0,0 +1,242 @@
+<template>
+  <div class="chat-widget">
+    <TransitionGroup name="ephem" tag="div" class="ephemeral-stack" v-if="ephemeralBubbles.length">
+      <div class="bubble" :class="{ fading: e.fading }" v-for="e in ephemeralBubbles" :key="e.id">{{ e.text }}</div>
+    </TransitionGroup>
+
+    <div class="composer" :class="{ 'is-focused': isComposerFocused }">
+      <input
+        v-model="text"
+        @keyup.enter="send"
+        @focus="isComposerFocused = true"
+        @blur="isComposerFocused = false"
+        type="text"
+        placeholder="Mensaje (no vinculante)"
+      />
+      <button class="btn" @click="send">Enviar</button>
+      <button class="btn secondary" @click="openModal" title="Abrir chat">💬</button>
+    </div>
+
+    <div class="modal-backdrop" v-if="showModal" @click.self="closeModal">
+      <div class="modal">
+        <div class="modal-header compact">
+          <div class="title">Chat</div>
+          <button class="btn close" @click="closeModal" aria-label="Cerrar">✕</button>
+        </div>
+        <div class="messages" ref="messagesEl">
+          <div
+            v-for="m in messages"
+            :key="m.id"
+            :class="['msg', m.mine ? 'mine' : 'theirs']"
+          >
+            <div class="meta">
+              <span class="author">{{ m.mine ? 'Tú' : m.from }}</span>
+              <span class="time">{{ formatTime(m.ts) }}</span>
+            </div>
+            <div class="body">{{ m.text }}</div>
+          </div>
+        </div>
+        <div class="modal-composer">
+          <input
+            v-model="text"
+            @keyup.enter="send"
+            type="text"
+            placeholder="Escribe un mensaje"
+          />
+          <button class="btn" @click="send">Enviar</button>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted, onUnmounted, watch, nextTick } from "vue";
+import { colyseusService } from "../../services/colyseus";
+
+interface ChatMsg {
+  id: string;
+  from: string;
+  fromId: string;
+  text: string;
+  ts: number;
+  mine: boolean;
+}
+
+const text = ref("");
+const isComposerFocused = ref(false);
+const messages = ref<ChatMsg[]>([]);
+const showModal = ref(false);
+const messagesEl = ref<HTMLDivElement | null>(null);
+const ephemeralBubbles = ref<{ id: string; text: string; expiresAt: number; fading?: boolean }[]>([]);
+
+const ephemeralTimers = new Map<string, { fade?: any; remove?: any }>();
+let removeHandler: (() => void) | null = null;
+const FADE_MS = 500; // start leave transition this long before removal
+
+function send() {
+  const t = text.value.trim();
+  if (!t) return;
+
+  // Push locally
+  const id = `${Date.now()}-${Math.random().toString(36).slice(2)}`;
+  const mine: ChatMsg = {
+    id,
+    from: colyseusService.playerName.value || "Yo",
+    fromId: colyseusService.sessionId.value || "",
+    text: t,
+    ts: Date.now(),
+    mine: true,
+  };
+  messages.value.push(mine);
+  scrollToBottomSoon();
+
+  // Try to send through the room (server will broadcast)
+  const room = colyseusService.gameRoom.value;
+  try {
+    room?.send("chat", { id, text: t });
+  } catch (e) {
+    // no-op if room not available
+  }
+  text.value = "";
+}
+
+function handleIncoming(payload: any) {
+  // Avoid duplicates: if we already have this id, skip.
+  if (payload?.id && messages.value.some(m => m.id === payload.id)) {
+    return;
+  }
+  const mine = payload.fromId === colyseusService.sessionId.value;
+  const msg: ChatMsg = {
+    id: payload.id || `${payload.ts}-${payload.fromId}-${Math.random().toString(36).slice(2)}`,
+    from: payload.from || "Jugador",
+    fromId: payload.fromId || "",
+    text: payload.text || "",
+    ts: payload.ts || Date.now(),
+    mine,
+  };
+  messages.value.push(msg);
+  scrollToBottomSoon();
+
+  if (!mine) {
+    queueEphemeral(msg.id, msg.text);
+  }
+}
+
+function openModal() { showModal.value = true; }
+function closeModal() { showModal.value = false; }
+
+function queueEphemeral(id: string, t: string) {
+  // Compute duration based on words: min 3s, +0.5s per word up to 15s
+  const words = (t || '').trim().split(/\s+/).filter(Boolean).length;
+  const computed = Math.min(15, Math.max(3, words * 0.5));
+  const now = Date.now();
+  const upperMax = ephemeralBubbles.value.length
+    ? Math.max(...ephemeralBubbles.value.map(e => e.expiresAt))
+    : 0;
+  const expiresAt = Math.max(now + computed * 1000, upperMax || 0);
+
+  const bubble = { id, text: t, expiresAt };
+  ephemeralBubbles.value.push(bubble);
+
+  // Schedule removal when its time comes
+  // Clear old timers if any
+  if (ephemeralTimers.has(id)) {
+    const t = ephemeralTimers.get(id)!;
+    if (t.fade) clearTimeout(t.fade);
+    if (t.remove) clearTimeout(t.remove);
+  }
+  const delay = Math.max(0, expiresAt - now);
+  const startDelay = Math.max(0, delay - FADE_MS);
+  const fadeTimer = setTimeout(() => {
+    const b = ephemeralBubbles.value.find(e => e.id === id);
+    if (b) b.fading = true;
+  }, startDelay);
+  const removeTimer = setTimeout(() => {
+    const idx = ephemeralBubbles.value.findIndex(e => e.id === id);
+    if (idx !== -1) ephemeralBubbles.value.splice(idx, 1);
+    ephemeralTimers.delete(id);
+  }, delay);
+  ephemeralTimers.set(id, { fade: fadeTimer, remove: removeTimer });
+}
+
+function formatTime(ts: number) {
+  const d = new Date(ts);
+  const hh = String(d.getHours()).padStart(2, "0");
+  const mm = String(d.getMinutes()).padStart(2, "0");
+  return `${hh}:${mm}`;
+}
+
+function scrollToBottomSoon() {
+  nextTick(() => {
+    const el = messagesEl.value;
+    if (el) el.scrollTop = el.scrollHeight;
+  });
+}
+
+onMounted(() => {
+  const room = colyseusService.gameRoom.value;
+  if (room) {
+    const handler = (data: any) => handleIncoming(data);
+    room.onMessage("chat", handler);
+    removeHandler = () => {
+      try { room.off?.("chat", handler as any); } catch(e) {}
+    };
+  }
+});
+
+onUnmounted(() => {
+  if (removeHandler) removeHandler();
+  for (const [, obj] of ephemeralTimers) {
+    if (obj.fade) clearTimeout(obj.fade);
+    if (obj.remove) clearTimeout(obj.remove);
+  }
+  ephemeralTimers.clear();
+});
+
+// Ensure modal autoscrolls when opened
+watch(showModal, (v) => { if (v) scrollToBottomSoon(); });
+</script>
+
+<style scoped>
+.chat-widget { position: fixed; right: 16px; bottom: 16px; z-index: 50; }
+.composer { display:flex; gap:8px; background:rgba(255,255,255,0.5); padding:8px; border-radius:10px; border:1px solid #000; box-shadow: 0 16px 48px rgba(0,0,0,0.45), 0 4px 12px rgba(0,0,0,0.35); transition: background-color 0.2s ease, background 0.2s ease; }
+.composer.is-focused { background:#ffffff; }
+.composer input { width: 60px; padding:8px; border:1px solid #e0e0e0; border-radius:8px; background: rgba(255,255,255,0.2); transition: width 0.25s ease, background-color 0.2s ease, border-color 0.2s ease; }
+.composer.is-focused input { width: 240px; }
+.composer.is-focused input { background: #ffffff; }
+.composer .btn { background: rgba(227,242,253,0.5); transition: background-color 0.2s ease, background 0.2s ease; }
+.composer .btn.secondary { background: rgba(245,245,245,0.4); }
+.composer.is-focused .btn { background: #e3f2fd; }
+.composer.is-focused .btn.secondary { background: #f5f5f5; }
+.btn { padding:8px 10px; border:none; border-radius:8px; background:#e3f2fd; color:#1565c0; cursor:pointer; }
+.btn.secondary { background:#f5f5f5; color:#333; }
+.btn.close { background:#f5f5f5; color:#333; }
+
+.ephemeral-stack { position:absolute; right: 0; bottom: 56px; display:flex; flex-direction: column; align-items:flex-end; gap:8px; pointer-events: none; width: clamp(220px, 50vw, 380px); }
+.bubble { max-width: 100%; background:#333; color:#fff; padding:8px 10px; border-radius:12px; box-shadow:0 8px 16px rgba(0,0,0,0.25); transition: opacity 0.5s ease; white-space: normal; overflow-wrap: anywhere; word-break: break-word; }
+.bubble.fading { opacity: 0; }
+/* TransitionGroup animations for stacking upward smoothly and fading */
+.ephem-enter-from { opacity: 0; transform: translateY(10px); }
+.ephem-enter-to { opacity: 1; transform: translateY(0); }
+.ephem-enter-active { transition: all 0.25s ease; }
+.ephem-leave-from { opacity: 1; transform: translateY(0); }
+.ephem-leave-to { opacity: 0; transform: translateY(0); }
+.ephem-leave-active { transition: opacity 0.5s ease; position: absolute; }
+.ephem-move { transition: transform 0.25s ease; }
+@keyframes fadein { from { opacity:0; transform: translateY(8px);} to { opacity:1; transform: translateY(0);} }
+
+.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.3); display:flex; align-items:flex-end; justify-content:center; padding: 8px; }
+.modal { width: 100%; max-width: 480px; background:#fff; border-radius: 10px; box-shadow: 0 -10px 30px rgba(0,0,0,0.25); display:flex; flex-direction:column; max-height: 70vh; }
+.modal-header { display:flex; align-items:center; justify-content:space-between; padding:4px 6px; border-bottom:1px solid #eee; min-height: 28px; }
+.modal-header.compact .title { font-weight:600; font-size: 12px; line-height: 1; }
+.messages { padding: 10px; overflow:auto; display:flex; flex-direction:column; gap:10px; flex: 1 1 auto; }
+.modal-composer { display:flex; gap:8px; padding:8px 10px; border-top:1px solid #eee; }
+.modal-composer input { flex:1; padding:8px; border:1px solid #e0e0e0; border-radius:8px; }
+.btn.close { width: 22px; height: 22px; padding: 0; line-height: 1; display: inline-flex; align-items:center; justify-content:center; border-radius: 6px; }
+.msg { max-width: 75%; padding:8px 10px; border-radius:12px; box-shadow:0 4px 10px rgba(0,0,0,0.08); }
+.msg .meta { font-size: 12px; color:#666; margin-bottom: 2px; display:flex; gap:8px; }
+.msg .body { white-space: pre-wrap; }
+.msg.mine { align-self: flex-end; background:#e3f2fd; }
+.msg.theirs { align-self: flex-start; background:#f5f5f5; }
+</style>
diff --git a/client/src/views/games/G5.vue b/client/src/views/games/G5.vue
index b427b28..02b3f70 100644
--- a/client/src/views/games/G5.vue
+++ b/client/src/views/games/G5.vue
@@ -1,10 +1,6 @@
 <template>
   <div class="g">
     <h3>G5 – Cheap talk (chat previo no vinculante)</h3>
-    <div class="chat">
-      <input v-model="msg" placeholder="Mensaje (no vinculante)" />
-      <button class="btn" @click="send">Enviar</button>
-    </div>
     <OfferControls v-if="myRole==='P1' && !state.offer?.active" @propose="onPropose" @no-offer="onNoOffer"/>
     <div v-if="state.offer?.active && !state.p2Action" class="controls">
       <div class="offer-view">Oferta: 🦃 {{ state.offer.offerPavo }} / 🌽 {{ state.offer.offerElote }} | Pedido: 🦃 {{ state.offer.requestPavo }} / 🌽 {{ state.offer.requestElote }}</div>
@@ -19,20 +15,11 @@
 </template>
 
 <script setup lang="ts">
-import { ref } from 'vue';
-import { colyseusService } from '../../services/colyseus';
 import OfferControls from './OfferControls.vue';
 
 const props = defineProps<{ state: any; myRole: string }>();
 const emit = defineEmits(['p1Action','p2Action','proposeOffer']);
 
-const msg = ref('');
-function send() {
-  // For MVP, just log locally; can be wired to room message later
-  console.log('cheap talk:', msg.value);
-  msg.value = '';
-}
-
 function onPropose(payload: any) { 
   emit('proposeOffer', payload); 
 }
@@ -44,8 +31,6 @@ function onNoOffer() {
 <style scoped>
 .g { background:#fff; padding:12px; border-radius:8px; }
 .controls { display:flex; gap:8px; margin:8px 0; }
-.chat { display:flex; gap:8px; margin:8px 0; }
-.chat input { flex:1; padding:8px; border-radius:6px; border:1px solid #ddd; }
 .btn { padding:8px 12px; border:none; border-radius:6px; background:#e3f2fd; color:#1565c0; cursor:pointer; }
 .offer-view { font-size: 14px; color:#333; }
 .hint { color:#666; }
diff --git a/server/src/rooms/GameRoom.ts b/server/src/rooms/GameRoom.ts
index 1180af3..9331605 100644
--- a/server/src/rooms/GameRoom.ts
+++ b/server/src/rooms/GameRoom.ts
@@ -128,6 +128,19 @@ export class GameRoom extends Room<GameState> {
       this.advanceRound();
     });
 
+    // Cheap talk / chat broadcast (non-binding)
+    this.onMessage("chat", (client, payload: { id?: string; text: string }) => {
+      const raw = (payload?.text ?? "").toString();
+      const text = raw.slice(0, 500); // basic guard
+      if (!text.trim()) return;
+      const player = this.state.players.get(client.sessionId);
+      const from = player?.name || "player";
+      const ts = Date.now();
+      const id = (payload as any)?.id || `${ts}-${client.sessionId}`;
+      // Broadcast to all (including sender) so both UIs render the same
+      this.broadcast("chat", { id, text, from, fromId: client.sessionId, ts });
+    });
+
     // G3 shame token after snatch
     this.onMessage("assignShame", (client, assign: boolean) => {
       const player = this.state.players.get(client.sessionId);