diff --git a/public/game.html b/public/game.html
index 53694ab..fa7c774 100644
--- a/public/game.html
+++ b/public/game.html
@@ -76,6 +76,7 @@
       <section class="panel action-panel" id="action-panel">
         <div class="tabs" role="tablist">
           <button class="tab active" data-tab="hunt" role="tab" aria-selected="true">Hunt</button>
+          <button class="tab" data-tab="expedition" role="tab" aria-selected="false">Expedition</button>
           <button class="tab" data-tab="inventory" role="tab" aria-selected="false">Inventory</button>
         </div>
         <div id="hunt-tab">
@@ -83,6 +84,10 @@
             <p class="loading">Loading zones...</p>
           </div>
         </div>
+        <div id="expedition-tab" style="display:none;">
+          <div id="expedition-status"></div>
+          <div id="expedition-defs" class="expedition-defs"></div>
+        </div>
         <div id="inventory-tab" style="display:none;">
           <div class="inventory-container">
             <div class="equipment-panel">
diff --git a/public/js/game.js b/public/js/game.js
index 045a043..ac01170 100644
--- a/public/js/game.js
+++ b/public/js/game.js
@@ -17,6 +17,7 @@ function switchTab(tab) {
     t.setAttribute('aria-selected', isActive);
   });
   document.getElementById('hunt-tab').style.display = tab === 'hunt' ? '' : 'none';
+  document.getElementById('expedition-tab').style.display = tab === 'expedition' ? '' : 'none';
   document.getElementById('inventory-tab').style.display = tab === 'inventory' ? '' : 'none';
 }
 
@@ -593,6 +594,196 @@ async function handleUnequip(slot) {
   }
 }
 
+// ===== Expedition UI =====
+let expeditionInterval = null;
+
+function formatTimeRemaining(ms) {
+  if (ms <= 0) return 'Finished';
+  const totalSec = Math.ceil(ms / 1000);
+  const mins = Math.floor(totalSec / 60);
+  const secs = totalSec % 60;
+  if (mins >= 60) {
+    const hours = Math.floor(mins / 60);
+    const remMins = mins % 60;
+    return `${hours}h ${remMins}m`;
+  }
+  return `${mins}:${secs.toString().padStart(2, '0')}`;
+}
+
+function formatDuration(sec) {
+  if (sec < 3600) return `${sec / 60} min`;
+  const hours = sec / 3600;
+  if (hours < 24) return `${hours}h`;
+  return `${hours / 24}d`;
+}
+
+async function loadExpeditions() {
+  try {
+    const data = await api.get('/expeditions/active');
+    if (!data || !data.ok) return;
+
+    const statusEl = document.getElementById('expedition-status');
+    const defsEl = document.getElementById('expedition-defs');
+
+    if (data.data) {
+      renderActiveExpedition(statusEl, defsEl, data.data);
+    } else {
+      statusEl.innerHTML = '';
+      renderExpeditionDefs(defsEl);
+    }
+  } catch (_) {
+    const statusEl = document.getElementById('expedition-status');
+    statusEl.innerHTML = '<p class="placeholder">Failed to load expedition data.</p>';
+  }
+}
+
+function renderActiveExpedition(statusEl, defsEl, expeditionData) {
+  defsEl.innerHTML = '';
+
+  const { expedition, definition, timeRemaining, isFinished } = expeditionData;
+  const elapsed = (definition.durationSec * 1000) - timeRemaining;
+  const pct = Math.min(100, Math.max(0, (elapsed / (definition.durationSec * 1000)) * 100));
+
+  let html = `<div class="expedition-active-card">`;
+  html += `<div class="expedition-name">${definition.name}</div>`;
+  html += `<div class="expedition-desc">${definition.description}</div>`;
+
+  // Progress bar
+  html += `<div class="expedition-progress">`;
+  html += `<div class="expedition-progress-bar">`;
+  html += `<div class="expedition-progress-fill" style="width:${pct}%"></div>`;
+  html += `</div>`;
+  html += `<div class="expedition-progress-text">${formatTimeRemaining(timeRemaining)}</div>`;
+  html += `</div>`;
+
+  if (isFinished) {
+    html += `<button class="btn btn-expedition btn-claim" data-expedition-id="${expedition.id}">Claim Rewards</button>`;
+    html += `<div class="expedition-rewards-preview">Rewards: ${definition.xpReward} XP, ${definition.goldMin}–${definition.goldMax} Gold</div>`;
+  } else {
+    html += `<div class="expedition-info">Duration: ${formatDuration(definition.durationSec)} · Cost: ${definition.energyCost}⚡</div>`;
+  }
+
+  html += `</div>`;
+  statusEl.innerHTML = html;
+
+  // Attach claim handler
+  const claimBtn = statusEl.querySelector('.btn-claim');
+  if (claimBtn) {
+    claimBtn.addEventListener('click', handleClaimExpedition);
+  }
+}
+
+function renderExpeditionDefs(container) {
+  container.innerHTML = '';
+
+  // Fetch expedition definitions from the server
+  api.get('/expeditions/defs').then(defsData => {
+    if (!defsData || !defsData.ok || !defsData.data) return;
+
+    const defs = defsData.data;
+    for (const def of defs) {
+      const card = document.createElement('div');
+      card.className = 'expedition-def-card';
+
+      const nameEl = document.createElement('div');
+      nameEl.className = 'expedition-name';
+      nameEl.textContent = def.name;
+
+      const descEl = document.createElement('div');
+      descEl.className = 'expedition-desc';
+      descEl.textContent = def.description;
+
+      const infoEl = document.createElement('div');
+      infoEl.className = 'expedition-info';
+      infoEl.textContent = `${formatDuration(def.durationSec)} · ${def.energyCost}⚡ · Lv${def.min_level}+`;
+
+      const rewardsEl = document.createElement('div');
+      rewardsEl.className = 'expedition-rewards';
+      rewardsEl.textContent = `+${def.xpReward} XP, ${def.goldMin}–${def.gold_max} Gold`;
+
+      const btn = document.createElement('button');
+      btn.className = 'btn btn-expedition';
+      btn.textContent = `Start Expedition (${def.energyCost}⚡)`;
+      btn.disabled = window.heroLevel < def.min_level;
+      btn.dataset.defId = def.id;
+
+      if (window.heroLevel < def.min_level) {
+        btn.title = `Requires level ${def.min_level}`;
+      }
+
+      card.appendChild(nameEl);
+      card.appendChild(descEl);
+      card.appendChild(infoEl);
+      card.appendChild(rewardsEl);
+      card.appendChild(btn);
+      container.appendChild(card);
+
+      btn.addEventListener('click', handleStartExpedition);
+    }
+  }).catch(() => {
+    container.innerHTML = '<p class="placeholder">Failed to load expedition options.</p>';
+  });
+}
+
+async function handleStartExpedition(e) {
+  const btn = e.target;
+  const defId = Number(btn.dataset.defId);
+  if (isNaN(defId)) return;
+
+  btn.disabled = true;
+  btn.textContent = 'Starting...';
+
+  try {
+    const data = await api.post('/expeditions/start', { defId });
+    if (!data || !data.ok) {
+      showToast(data?.error?.message || 'Failed to start expedition.', 'error');
+      return;
+    }
+    showToast('Expedition started!', 'info');
+    loadExpeditions();
+    loadCharacter(); // refresh energy
+  } catch (err) {
+    showToast('Failed to start expedition.', 'error');
+  }
+}
+
+async function handleClaimExpedition(e) {
+  const btn = e.target;
+  const expeditionId = Number(btn.dataset.expeditionId);
+  if (isNaN(expeditionId)) return;
+
+  btn.disabled = true;
+  btn.textContent = 'Claiming...';
+
+  try {
+    const data = await api.post('/expeditions/claim', { expeditionId });
+    if (!data || !data.ok) {
+      showToast(data?.error?.message || 'Failed to claim expedition.', 'error');
+      return;
+    }
+
+    const { xpGained, goldGained } = data.data;
+    showToast(`Expedition complete! +${xpGained} XP, +${goldGained} Gold`, 'info');
+    loadExpeditions();
+    loadCharacter(); // refresh gold/XP
+  } catch (err) {
+    showToast('Failed to claim expedition.', 'error');
+  }
+}
+
+/**
+ * Periodically refresh expedition progress while on the expedition tab.
+ * Updates the progress bar and time remaining every 5 seconds.
+ */
+function startExpeditionSync() {
+  if (expeditionInterval) clearInterval(expeditionInterval);
+  expeditionInterval = setInterval(() => {
+    if (currentTab === 'expedition') {
+      loadExpeditions();
+    }
+  }, 5000);
+}
+
 // ===== Toast notifications =====
 function showToast(message, type = 'info') {
   // Remove existing toasts