diff --git a/css/game.css b/css/game.css
index dc3faba..0814732 100644
--- a/css/game.css
+++ b/css/game.css
@@ -363,6 +363,23 @@ h2, h3 {
opacity: 0.4;
}
+/* Prestige Upgrades header + Buy Max button */
+.prestige-upgrades-header {
+ display: flex;
+ align-items: center;
+ justify-content: space-between;
+ margin-bottom: 10px;
+}
+
+.prestige-upgrades-header h3 {
+ margin: 0;
+}
+
+.prestige-buy-all {
+ background: var(--accent-gold);
+ color: var(--bg-primary, #1a1035);
+}
+
/* Side Panel Tabs */
.tabs {
display: flex;
diff --git a/dev-journal.md b/dev-journal.md
index 53339de..092c6e3 100644
--- a/dev-journal.md
+++ b/dev-journal.md
@@ -414,3 +414,31 @@ Wrote a headless Node.js test (`/opt/data/idle-game-test/buy-all-upgrades-test.m
- 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.
+
+---
+
+### Session 15 - 2026-08-24 (Morning)
+**Status:** ✅ Buy Max Prestige Upgrades (bulk-buy for prestige upgrades) Added
+
+#### What was done:
+- Followed up on Session 14's own "next goal" by adding a **Buy Max** button to the **Prestige Upgrades** list. Previously one-time prestige upgrades could only be purchased individually (one click each), which was tedious once several were available — buildings had Buy Max (Session 10) and regular upgrades had Buy All (Session 14), but prestige upgrades did not. This brings prestige upgrades in line with that established bulk-buy convention.
+- Added `Game.buyMaxPrestigeUpgrades()` to `js/game.js`. It loops through every entry in `PRESTIGE_UPGRADES`, skips owned ones, respects each upgrade's (optional) `requirements` building-count gate, and buys everything affordable at once from **Stellar Essence**. It runs until a full pass purchases nothing (loop kept for symmetry with `buyAllUpgrades` and to stay safe if future prestige upgrades gain requirement gates), then decrements `stellarEssence` per purchase (mirroring `PRESTIGE.buyUpgrade`) and returns `{ bought: count, ids: [...] }`.
+- Wired the button into the Prestige tab in `index.html` (`#buy-all-prestige`, placed alongside a left-aligned header row mirroring the Upgrades tab's Buy All layout). Added a click listener in `PrestigeUI.setupEventListeners()`.
+- Added `PrestigeUI.updateBuyMaxPrestigeButton()` (called from `PrestigeUI.update()` each tick) which shows/hides and enables/disables the button based on whether any unowned, requirement-met prestige upgrade is currently affordable with Stellar Essence — a read-only state check, exactly mirroring `UI.updateBuyAllButton()`.
+- Added CSS for `.prestige-upgrades-header` (flex layout) and `.prestige-buy-all` (gold accent theme reusing the existing `.buy-all-btn` base, matching the Upgrades tab's Buy All button).
+- **Bug found & fixed during testing:** the first implementation of `buyMaxPrestigeUpgrades()` added upgrades to the list but never decremented `stellarEssence`, which would have let players prestige-buy unlimited upgrades for free. The headless test asserted essence depletion and caught it; added the missing `this.state.stellarEssence -= upgrade.cost` line so spend mirrors `PRESTIGE.buyUpgrade`.
+
+#### Files modified:
+- `js/game.js` - added `buyMaxPrestigeUpgrades()` method (with correct Stellar Essence spend)
+- `js/prestigeUI.js` - added click listener for the Buy Max button + `updateBuyMaxPrestigeButton()`; called from `update()` each tick
+- `index.html` - added Buy Max button to the Prestige Upgrades header
+- `css/game.css` - `.prestige-upgrades-header`, `.prestige-buy-all` styles
+- `dev-journal.md` - appended Session 15 entry
+
+#### Verification:
+Wrote a headless Node.js test (`/opt/data/idle-game-test/prestige-buy-max-test.mjs`) that loads the real `game.js`, `prestige.js`, and `prestigeUI.js` in-process with DOM/audio/particle stubs. **22/22 checks pass**, covering: no-op when nothing affordable, bulk purchase deducting Stellar Essence correctly, ungated-upgrade behavior (real prestige upgrades have no requirement gates), idempotent second call, already-owned upgrade skipping, notification-on-purchase vs silence on no-op, the missing-essence-spend regression (now fixed), and the real `PrestigeUI.updateBuyMaxPrestigeButton()` show/hide/enabled state against actual `PRESTIGE_UPGRADES` data. All existing suites re-ran clean with no regressions: buy-all-upgrades 24/24, buy-max 6/6, golden-bloom 22/22, slot-preview 22/22. All modified JS files pass `node --check`.
+
+#### Next goals:
+- Potential new building tiers or prestige milestones / new prestige upgrades.
+- Sound variations or background music.
+- Consider a global "Buy Max" for buildings across all types at once (currently per-building).
diff --git a/index.html b/index.html
index e7ba9dc..6394988 100644
--- a/index.html
+++ b/index.html
@@ -99,6 +99,10 @@
Prestige Upgrades
+
diff --git a/js/game.js b/js/game.js
index f363cf7..755d0e8 100644
--- a/js/game.js
+++ b/js/game.js
@@ -469,6 +469,53 @@ const Game = {
return { bought: bought.length, ids: bought };
},
+ /**
+ * Buy every prestige upgrade the player can currently afford at once,
+ * paid from Stellar Essence. Returns an object describing what happened:
+ * { bought: count, ids: [...] }. Prestige upgrades are one-time purchases,
+ * so we loop until a full pass buys nothing (purchasing one never unlocks
+ * another, but the loop is kept for symmetry with buyAllUpgrades and to
+ * stay safe should future prestige upgrades gain requirement gates).
+ */
+ buyMaxPrestigeUpgrades() {
+ const bought = [];
+ let progress = true;
+ while (progress) {
+ progress = false;
+ for (const [id, upgrade] of Object.entries(PRESTIGE_UPGRADES)) {
+ if ((this.state.prestigeUpgrades || []).includes(id)) continue;
+ // Respect requirements before attempting purchase, mirroring
+ // PRESTIGE.buyUpgrade semantics.
+ 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.stellarEssence || 0) >= upgrade.cost) {
+ this.state.prestigeUpgrades = this.state.prestigeUpgrades || [];
+ this.state.prestigeUpgrades.push(id);
+ // Spend Stellar Essence, mirroring PRESTIGE.buyUpgrade.
+ this.state.stellarEssence -= upgrade.cost;
+ bought.push(id);
+ progress = true;
+ }
+ }
+ }
+
+ if (bought.length > 0) {
+ UI.showNotification(`Bought ${bought.length} prestige upgrade(s)!`, 'achievement');
+ 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
diff --git a/js/prestigeUI.js b/js/prestigeUI.js
index 9a91fb2..e1bd7d9 100644
--- a/js/prestigeUI.js
+++ b/js/prestigeUI.js
@@ -43,6 +43,15 @@ const PrestigeUI = {
}
});
});
+
+ // Buy Max prestige upgrades button - buy every affordable prestige
+ // upgrade at once, paid from Stellar Essence.
+ const buyMaxBtn = document.getElementById('buy-all-prestige');
+ if (buyMaxBtn) {
+ buyMaxBtn.addEventListener('click', () => {
+ Game.buyMaxPrestigeUpgrades();
+ });
+ }
},
/**
@@ -119,7 +128,44 @@ const PrestigeUI = {
if (prestigeTab?.classList.contains('active')) {
this.renderPrestigeUpgrades();
}
- }
+
+ // Show/hide the "Buy Max" button based on whether any unowned prestige
+ // upgrade is currently affordable with Stellar Essence. Read-only.
+ this.updateBuyMaxPrestigeButton();
+ },
+
+ /**
+ * Show/hide and enable/disable the "Buy Max" prestige-upgrades button
+ * depending on whether at least one unowned, requirement-met prestige
+ * upgrade is currently affordable with Stellar Essence. Read of game state
+ * only; never mutates it. Mirrors Game.buyMaxPrestigeUpgrades /
+ * PRESTIGE.buyUpgrade semantics.
+ */
+ updateBuyMaxPrestigeButton() {
+ const btn = document.getElementById('buy-all-prestige');
+ if (!btn) return;
+
+ let affordableAny = false;
+ for (const [id, upgrade] of Object.entries(PRESTIGE_UPGRADES)) {
+ if ((Game.state.prestigeUpgrades || []).includes(id)) continue;
+ if ((Game.state.stellarEssence || 0) < upgrade.cost) continue;
+ 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;
+ },
};
window.PrestigeUI = PrestigeUI;