diff --git a/css/game.css b/css/game.css
index be42713..dc3faba 100644
--- a/css/game.css
+++ b/css/game.css
@@ -327,6 +327,42 @@ h2, h3 {
     opacity: 0.4;
 }
 
+/* Upgrades header + Buy All button */
+.upgrades-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 10px;
+}
+
+.upgrades-header h3 {
+    margin: 0;
+}
+
+.buy-all-btn {
+    background: var(--accent-gold);
+    color: var(--bg-primary, #1a1035);
+    border: none;
+    border-radius: 6px;
+    padding: 6px 14px;
+    cursor: pointer;
+    font-weight: bold;
+    font-size: 0.8rem;
+    transition: all 0.2s ease;
+}
+
+.buy-all-btn:hover:not(:disabled) {
+    background: #f1c40f;
+    transform: scale(1.03);
+}
+
+.buy-all-btn:disabled {
+    background: var(--text-muted);
+    color: var(--bg-primary, #1a1035);
+    cursor: not-allowed;
+    opacity: 0.4;
+}
+
 /* Side Panel Tabs */
 .tabs {
     display: flex;
diff --git a/dev-journal.md b/dev-journal.md
index f54de9b..53339de 100644
--- a/dev-journal.md
+++ b/dev-journal.md
@@ -386,3 +386,31 @@ Wrote a headless Node.js test (`/opt/data/idle-game-test/slot-preview-test.mjs`)
 - Consider adding a "Buy Max" button to upgrades too (one-time purchases — less critical).
 - Potential new building tiers or prestige milestones.
 - Sound variations or background music.
+
+---
+
+### Session 14 - 2026-08-24 (Morning)
+**Status:** ✅ Buy All Upgrades (Bulk-Buy for Upgrades) Added
+
+#### What was done:
+- Followed up on Sessions 10, 11, and 13's recurring "next goal" by adding a **Buy All** button to the Upgrades tab. Previously one-time upgrades could only be purchased individually (one click each), which was tedious once dozens were available — buildings already had a Buy Max bulk-buy from Session 10, but upgrades did not.
+- Added `Game.buyAllUpgrades()` which loops through every upgrade in `UPGRADES`, skips owned ones, respects each upgrade's `requirements` (building-count gates), and buys everything affordable at once. It runs until a full pass purchases nothing (so buying one upgrade can unlock affordability for another via the stardust re-check), then returns `{ bought: count, ids: [...] }`.
+- Wired a **Buy All** button into the Upgrades tab header in `index.html` (`#buy-all-upgrades`).
+- Added `UI.updateBuyAllButton()` (called from `UI.updateUpgrades()` each tick) which shows/hides the button based on whether any unowned, requirement-met upgrade is currently affordable, and toggles its disabled state live.
+- Added CSS for `.upgrades-header` (flex layout) and `.buy-all-btn` (gold accent theme matching existing buttons, hover scale, disabled state).
+- Fixed a latent bug found during testing: the empty-slot branch of `Game.switchSlot()` did not reset `state.productionBoostUntil`, which could leave a stale golden-bloom boost active after switching to a fresh slot. Added `productionBoostUntil: 0` to that branch for symmetry with `reset()`.
+
+#### Files modified:
+- `js/game.js` - added `buyAllUpgrades()` method; wired Buy All button click listener in setupEventListeners(); fixed empty-slot productionBoostUntil reset in switchSlot()
+- `js/ui.js` - added `updateBuyAllButton()`; called it from `updateUpgrades()` each tick
+- `index.html` - added Buy All button to Upgrades tab header
+- `css/game.css` - `.upgrades-header`, `.buy-all-btn` styles
+- `dev-journal.md` - appended Session 14 entry
+
+#### Verification:
+Wrote a headless Node.js test (`/opt/data/idle-game-test/buy-all-upgrades-test.mjs`) evaluating the real game.js and ui.js in-process with DOM/audio/particle stubs. **24/24 checks pass**, covering: no-op when nothing affordable, bulk purchase with requirement gating (blocks unmet requirements), chained affordability across loop passes, idempotent second call, already-owned upgrade skipping, notification-on-purchase vs silence on no-op, and the real `UI.updateBuyAllButton()` show/hide/enabled state against actual BUILDINGS/UPGRADES data. Existing buy-max (6/6) and golden-bloom (22/22) tests re-ran clean — no regressions. All modified JS files pass `node --check`.
+
+#### Next goals:
+- Consider adding a "Buy Max" button to the prestige upgrades list as well.
+- Potential new building tiers or prestige milestones.
+- Sound variations or background music.
diff --git a/index.html b/index.html
index 44fe786..e7ba9dc 100644
--- a/index.html
+++ b/index.html
@@ -58,7 +58,10 @@
                 </div>
 
                 <div id="upgrades-tab" class="tab-content active">
-                    <h3>Upgrades</h3>
+                    <div class="upgrades-header">
+                        <h3>Upgrades</h3>
+                        <button id="buy-all-upgrades" class="buy-all-btn" style="display:none" title="Buy every upgrade you can currently afford">Buy All</button>
+                    </div>
                     <div id="upgrades-list"></div>
                 </div>
 
diff --git a/js/game.js b/js/game.js
index ed29e12..f363cf7 100644
--- a/js/game.js
+++ b/js/game.js
@@ -124,6 +124,14 @@ const Game = {
             UI.hideImportModal();
         });
 
+        // Buy All upgrades button.
+        const buyAllBtn = document.getElementById('buy-all-upgrades');
+        if (buyAllBtn) {
+            buyAllBtn.addEventListener('click', () => {
+                Game.buyAllUpgrades();
+            });
+        }
+
         document.getElementById('reset-btn').addEventListener('click', () => {
             if (confirm('Are you sure you want to reset all progress? This cannot be undone!')) {
                 this.reset();
@@ -419,6 +427,48 @@ const Game = {
         return false;
     },
 
+    /**
+     * Buy every upgrade the player can currently afford at once.
+     * Returns an object describing what happened: { bought: count, ids: [...] }.
+     * Upgrades are one-time purchases, so we loop until nothing affordable remains.
+     */
+    buyAllUpgrades() {
+        const bought = [];
+        // Loop until a pass buys nothing (each purchase may unlock new affordability).
+        let progress = true;
+        while (progress) {
+            progress = false;
+            for (const [id, upgrade] of Object.entries(UPGRADES)) {
+                if (this.state.upgrades.includes(id)) continue;
+                // Respect requirements before attempting purchase.
+                if (upgrade.requirements) {
+                    let met = true;
+                    for (const [reqId, reqCount] of Object.entries(upgrade.requirements)) {
+                        if ((this.state.buildings[reqId] || 0) < reqCount) {
+                            met = false;
+                            break;
+                        }
+                    }
+                    if (!met) continue;
+                }
+                if (this.state.stardust >= upgrade.cost) {
+                    this.state.stardust -= upgrade.cost;
+                    this.state.upgrades.push(id);
+                    bought.push(id);
+                    progress = true; // another purchase may have unlocked more affordability
+                }
+            }
+        }
+
+        if (bought.length > 0) {
+            UI.showNotification(`Bought ${bought.length} upgrade(s)!`, 'success');
+            Audio.playPurchase();
+            UI.update();
+        }
+
+        return { bought: bought.length, ids: bought };
+    },
+
     /**
      * Golden Starbloom - random event system.
      * A rare, time-limited bloom occasionally appears on screen. Clicking it
@@ -758,6 +808,9 @@ const Game = {
                 totalPrestigeEssence: this.state.totalPrestigeEssence || 0,
                 prestigeUpgrades: this.state.prestigeUpgrades || [],
                 goldenBlooms: { active: false, timer: 0, lastSpawn: Date.now(), totalClaimed: 0 },
+                // Reset the temporary golden-bloom production boost so a boost
+                // from a previous slot cannot leak into a fresh slot.
+                productionBoostUntil: 0,
                 activeSlot: slot,
                 autoSave: this.state.autoSave
             };
diff --git a/js/ui.js b/js/ui.js
index 395d47d..52bc7dc 100644
--- a/js/ui.js
+++ b/js/ui.js
@@ -189,15 +189,52 @@ const UI = {
         for (const [id, upgrade] of Object.entries(UPGRADES)) {
             const card = document.getElementById(`upgrade-${id}`);
             if (!card) continue;
-            
+
             const purchased = Game.state.upgrades.includes(id);
             const costEl = card.querySelector('.upgrade-cost');
-            
+
             if (costEl && !purchased) {
                 const canAfford = Game.state.stardust >= upgrade.cost;
                 costEl.textContent = canAfford ? `${Game.formatNumber(upgrade.cost)} ✨` : `❌ ${Game.formatNumber(upgrade.cost)} ✨`;
             }
         }
+
+        // Toggle the "Buy All" button: show it once at least one unowned,
+        // requirement-met upgrade exists, and disable it when nothing is
+        // affordable. Its enabled state is refreshed live each tick.
+        this.updateBuyAllButton();
+    },
+
+    /**
+     * Show/hide and enable/disable the "Buy All upgrades" button based on
+     * whether any unowned upgrade (whose requirements are met) is currently
+     * affordable. Read of game state only; never mutates it.
+     */
+    updateBuyAllButton() {
+        const btn = document.getElementById('buy-all-upgrades');
+        if (!btn) return;
+
+        let affordableAny = false;
+        for (const [id, upgrade] of Object.entries(UPGRADES)) {
+            if (Game.state.upgrades.includes(id)) continue;
+            if (Game.state.stardust < upgrade.cost) continue;
+            // Requirement check mirrors Game.buyUpgrade / buyAllUpgrades.
+            if (upgrade.requirements) {
+                let met = true;
+                for (const [reqId, reqCount] of Object.entries(upgrade.requirements)) {
+                    if ((Game.state.buildings[reqId] || 0) < reqCount) {
+                        met = false;
+                        break;
+                    }
+                }
+                if (!met) continue;
+            }
+            affordableAny = true;
+            break;
+        }
+
+        btn.style.display = affordableAny ? '' : 'none';
+        btn.disabled = !affordableAny;
     },
 
     /**