diff --git a/functions/dist/questions/assignDailyQuestion.js b/functions/dist/questions/assignDailyQuestion.js
index 042511d3..f663c356 100644
--- a/functions/dist/questions/assignDailyQuestion.js
+++ b/functions/dist/questions/assignDailyQuestion.js
@@ -34,6 +34,8 @@ var __importStar = (this && this.__importStar) || (function () {
 })();
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.assignDailyQuestionCallable = exports.assignDailyQuestion = void 0;
+exports.dayOfYearUtc = dayOfYearUtc;
+exports.isWildcardDay = isWildcardDay;
 exports.formatCstDate = formatCstDate;
 exports.parseCstDate = parseCstDate;
 exports.timestampAt6PmCst = timestampAt6PmCst;
@@ -202,12 +204,26 @@ function epochDayOf(dateStr) {
     const [y, m, d] = dateStr.split('-').map(Number);
     return Math.floor(Date.UTC(y, m - 1, d) / 86400000);
 }
+// The client promotes ~10% of days to a "Wildcard" surprise theme instead of the weekday mode
+// (DailyModeResolver.resolve(): dayOfYear % 10 === 3). FROZEN to mirror that tag + cadence.
+const WILDCARD_MODE_TAG = 'mode_wildcard';
+/** 1-based day of the year for a YYYY-MM-DD date (UTC) — matches Java's Calendar.DAY_OF_YEAR,
+ *  which the client's DailyModeResolver uses for its wildcard cadence. */
+function dayOfYearUtc(dateStr) {
+    const [y, m, d] = dateStr.split('-').map(Number);
+    return Math.floor((Date.UTC(y, m - 1, d) - Date.UTC(y, 0, 1)) / 86400000) + 1;
+}
+/** Mirrors the client's DailyModeResolver ~10% wildcard override (dayOfYear % 10 === 3). */
+function isWildcardDay(dateStr) {
+    return dayOfYearUtc(dateStr) % 10 === 3;
+}
 /**
  * Deterministically pick the SAME daily question the free client would compute for [dateStr]:
- * today's weekday mode, ordered by id, indexed by epochDay % poolSize. Making this SERVER-side and
- * authoritative also fixes partners in different time zones getting different questions (the client
- * falls back to device-local weekday only when there is no server assignment). Returns null if the
- * questions pool is unseeded so the caller can no-op rather than write an unresolvable id.
+ * today's mode (weekday, or wildcard on ~10% of days), ordered by id, indexed by epochDay %
+ * poolSize. Making this SERVER-side and authoritative also fixes partners in different time zones
+ * getting different questions (the client falls back to device-local weekday only when there is no
+ * server assignment). Returns null if the questions pool is unseeded so the caller can no-op rather
+ * than write an unresolvable id.
  */
 async function pickDailyQuestionId(dateStr) {
     const db = admin.firestore();
@@ -220,14 +236,16 @@ async function pickDailyQuestionId(dateStr) {
         .get();
     if (snapshot.empty)
         return null;
-    const weekday = new Date(`${dateStr}T12:00:00Z`).getUTCDay();
-    const modeTag = WEEKDAY_MODE_TAGS[weekday];
-    const inMode = snapshot.docs
-        .filter((d) => d.get('modeTag') === modeTag)
-        .sort((a, b) => (a.id < b.id ? -1 : a.id > b.id ? 1 : 0));
-    const pool = inMode.length > 0
-        ? inMode
-        : snapshot.docs.slice().sort((a, b) => (a.id < b.id ? -1 : a.id > b.id ? 1 : 0)); // wildcard/empty-mode fallback
+    const byId = (a, b) => (a.id < b.id ? -1 : a.id > b.id ? 1 : 0);
+    const inTag = (tag) => snapshot.docs.filter((d) => d.get('modeTag') === tag).sort(byId);
+    const weekdayTag = WEEKDAY_MODE_TAGS[new Date(`${dateStr}T12:00:00Z`).getUTCDay()];
+    // On a wildcard day prefer the wildcard pool; if it isn't seeded yet, fall back to today's
+    // WEEKDAY mode (not the whole pool), so this stays a safe no-op until wildcard content lands.
+    let pool = isWildcardDay(dateStr) ? inTag(WILDCARD_MODE_TAG) : [];
+    if (pool.length === 0)
+        pool = inTag(weekdayTag);
+    if (pool.length === 0)
+        pool = snapshot.docs.slice().sort(byId); // last-resort: mode unseeded
     const offset = ((epochDayOf(dateStr) % pool.length) + pool.length) % pool.length;
     return pool[offset].id;
 }
diff --git a/functions/dist/questions/assignDailyQuestion.js.map b/functions/dist/questions/assignDailyQuestion.js.map
index 9682dcf5..37b5808b 100644
--- a/functions/dist/questions/assignDailyQuestion.js.map
+++ b/functions/dist/questions/assignDailyQuestion.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/functions/dist/questions/assignDailyQuestion.test.js b/functions/dist/questions/assignDailyQuestion.test.js
index b4a19863..dec4350d 100644
--- a/functions/dist/questions/assignDailyQuestion.test.js
+++ b/functions/dist/questions/assignDailyQuestion.test.js
@@ -35,4 +35,32 @@ describe('Chicago date helpers (DST-safe)', () => {
         }
     });
 });
+// Wildcard cadence must mirror the client's DailyModeResolver (dayOfYear % 10 === 3), or the
+// server would assign a weekday question on days the app themes "Wildcard" (and vice versa).
+describe('wildcard-day cadence (mirrors client DailyModeResolver)', () => {
+    it('computes 1-based day-of-year like Calendar.DAY_OF_YEAR', () => {
+        expect((0, assignDailyQuestion_1.dayOfYearUtc)('2026-01-01')).toBe(1);
+        expect((0, assignDailyQuestion_1.dayOfYearUtc)('2026-01-03')).toBe(3);
+        expect((0, assignDailyQuestion_1.dayOfYearUtc)('2026-02-01')).toBe(32);
+        expect((0, assignDailyQuestion_1.dayOfYearUtc)('2026-12-31')).toBe(365); // 2026 is not a leap year
+        expect((0, assignDailyQuestion_1.dayOfYearUtc)('2028-12-31')).toBe(366); // leap year
+    });
+    it('fires wildcard exactly when day-of-year mod 10 === 3', () => {
+        expect((0, assignDailyQuestion_1.isWildcardDay)('2026-01-03')).toBe(true); // doy 3
+        expect((0, assignDailyQuestion_1.isWildcardDay)('2026-01-13')).toBe(true); // doy 13
+        expect((0, assignDailyQuestion_1.isWildcardDay)('2026-02-01')).toBe(false); // doy 32
+        expect((0, assignDailyQuestion_1.isWildcardDay)('2026-01-01')).toBe(false); // doy 1
+        expect((0, assignDailyQuestion_1.isWildcardDay)('2026-01-04')).toBe(false); // doy 4
+    });
+    it('flags ~10% of the year as wildcard days', () => {
+        let wild = 0;
+        for (let doy = 1; doy <= 365; doy++) {
+            const d = new Date(Date.UTC(2026, 0, doy));
+            const dateStr = d.toISOString().slice(0, 10);
+            if ((0, assignDailyQuestion_1.isWildcardDay)(dateStr))
+                wild++;
+        }
+        expect(wild).toBe(36); // doy ∈ {3,13,…,363} → 36 days
+    });
+});
 //# sourceMappingURL=assignDailyQuestion.test.js.map
\ No newline at end of file
diff --git a/functions/dist/questions/assignDailyQuestion.test.js.map b/functions/dist/questions/assignDailyQuestion.test.js.map
index bc89f3cb..85d36bfb 100644
--- a/functions/dist/questions/assignDailyQuestion.test.js.map
+++ b/functions/dist/questions/assignDailyQuestion.test.js.map
@@ -1 +1 @@
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diff --git a/functions/src/questions/assignDailyQuestion.test.ts b/functions/src/questions/assignDailyQuestion.test.ts
index 089bdfe3..11b8d203 100644
--- a/functions/src/questions/assignDailyQuestion.test.ts
+++ b/functions/src/questions/assignDailyQuestion.test.ts
@@ -1,4 +1,4 @@
-import { formatCstDate, parseCstDate, timestampAt6PmCst } from './assignDailyQuestion'
+import { formatCstDate, parseCstDate, timestampAt6PmCst, dayOfYearUtc, isWildcardDay } from './assignDailyQuestion'
 
 // DST regression tests for the Chicago date helpers (the old hardcoded -6 offset
 // mislabeled dates and shifted reveal times during the ~8 CDT months).
@@ -38,3 +38,33 @@ describe('Chicago date helpers (DST-safe)', () => {
     }
   })
 })
+
+// Wildcard cadence must mirror the client's DailyModeResolver (dayOfYear % 10 === 3), or the
+// server would assign a weekday question on days the app themes "Wildcard" (and vice versa).
+describe('wildcard-day cadence (mirrors client DailyModeResolver)', () => {
+  it('computes 1-based day-of-year like Calendar.DAY_OF_YEAR', () => {
+    expect(dayOfYearUtc('2026-01-01')).toBe(1)
+    expect(dayOfYearUtc('2026-01-03')).toBe(3)
+    expect(dayOfYearUtc('2026-02-01')).toBe(32)
+    expect(dayOfYearUtc('2026-12-31')).toBe(365) // 2026 is not a leap year
+    expect(dayOfYearUtc('2028-12-31')).toBe(366) // leap year
+  })
+
+  it('fires wildcard exactly when day-of-year mod 10 === 3', () => {
+    expect(isWildcardDay('2026-01-03')).toBe(true) // doy 3
+    expect(isWildcardDay('2026-01-13')).toBe(true) // doy 13
+    expect(isWildcardDay('2026-02-01')).toBe(false) // doy 32
+    expect(isWildcardDay('2026-01-01')).toBe(false) // doy 1
+    expect(isWildcardDay('2026-01-04')).toBe(false) // doy 4
+  })
+
+  it('flags ~10% of the year as wildcard days', () => {
+    let wild = 0
+    for (let doy = 1; doy <= 365; doy++) {
+      const d = new Date(Date.UTC(2026, 0, doy))
+      const dateStr = d.toISOString().slice(0, 10)
+      if (isWildcardDay(dateStr)) wild++
+    }
+    expect(wild).toBe(37) // doy ∈ {3,13,…,363} → 37 days (~10.1%)
+  })
+})
diff --git a/functions/src/questions/assignDailyQuestion.ts b/functions/src/questions/assignDailyQuestion.ts
index 55504cb1..2673f84d 100644
--- a/functions/src/questions/assignDailyQuestion.ts
+++ b/functions/src/questions/assignDailyQuestion.ts
@@ -177,12 +177,29 @@ function epochDayOf(dateStr: string): number {
   return Math.floor(Date.UTC(y, m - 1, d) / 86_400_000)
 }
 
+// The client promotes ~10% of days to a "Wildcard" surprise theme instead of the weekday mode
+// (DailyModeResolver.resolve(): dayOfYear % 10 === 3). FROZEN to mirror that tag + cadence.
+const WILDCARD_MODE_TAG = 'mode_wildcard'
+
+/** 1-based day of the year for a YYYY-MM-DD date (UTC) — matches Java's Calendar.DAY_OF_YEAR,
+ *  which the client's DailyModeResolver uses for its wildcard cadence. */
+export function dayOfYearUtc(dateStr: string): number {
+  const [y, m, d] = dateStr.split('-').map(Number)
+  return Math.floor((Date.UTC(y, m - 1, d) - Date.UTC(y, 0, 1)) / 86_400_000) + 1
+}
+
+/** Mirrors the client's DailyModeResolver ~10% wildcard override (dayOfYear % 10 === 3). */
+export function isWildcardDay(dateStr: string): boolean {
+  return dayOfYearUtc(dateStr) % 10 === 3
+}
+
 /**
  * Deterministically pick the SAME daily question the free client would compute for [dateStr]:
- * today's weekday mode, ordered by id, indexed by epochDay % poolSize. Making this SERVER-side and
- * authoritative also fixes partners in different time zones getting different questions (the client
- * falls back to device-local weekday only when there is no server assignment). Returns null if the
- * questions pool is unseeded so the caller can no-op rather than write an unresolvable id.
+ * today's mode (weekday, or wildcard on ~10% of days), ordered by id, indexed by epochDay %
+ * poolSize. Making this SERVER-side and authoritative also fixes partners in different time zones
+ * getting different questions (the client falls back to device-local weekday only when there is no
+ * server assignment). Returns null if the questions pool is unseeded so the caller can no-op rather
+ * than write an unresolvable id.
  */
 async function pickDailyQuestionId(dateStr: string): Promise<string | null> {
   const db = admin.firestore()
@@ -195,14 +212,16 @@ async function pickDailyQuestionId(dateStr: string): Promise<string | null> {
     .get()
   if (snapshot.empty) return null
 
-  const weekday = new Date(`${dateStr}T12:00:00Z`).getUTCDay()
-  const modeTag = WEEKDAY_MODE_TAGS[weekday]
-  const inMode = snapshot.docs
-    .filter((d) => d.get('modeTag') === modeTag)
-    .sort((a, b) => (a.id < b.id ? -1 : a.id > b.id ? 1 : 0))
-  const pool = inMode.length > 0
-    ? inMode
-    : snapshot.docs.slice().sort((a, b) => (a.id < b.id ? -1 : a.id > b.id ? 1 : 0)) // wildcard/empty-mode fallback
+  type Doc = FirebaseFirestore.QueryDocumentSnapshot
+  const byId = (a: Doc, b: Doc): number => (a.id < b.id ? -1 : a.id > b.id ? 1 : 0)
+  const inTag = (tag: string): Doc[] => snapshot.docs.filter((d) => d.get('modeTag') === tag).sort(byId)
+
+  const weekdayTag = WEEKDAY_MODE_TAGS[new Date(`${dateStr}T12:00:00Z`).getUTCDay()]
+  // On a wildcard day prefer the wildcard pool; if it isn't seeded yet, fall back to today's
+  // WEEKDAY mode (not the whole pool), so this stays a safe no-op until wildcard content lands.
+  let pool: Doc[] = isWildcardDay(dateStr) ? inTag(WILDCARD_MODE_TAG) : []
+  if (pool.length === 0) pool = inTag(weekdayTag)
+  if (pool.length === 0) pool = snapshot.docs.slice().sort(byId) // last-resort: mode unseeded
   const offset = ((epochDayOf(dateStr) % pool.length) + pool.length) % pool.length
   return pool[offset].id
 }
diff --git a/seed/questions/DAILY_SINGLE_CHOICE_WEEKDAY_SYSTEM.md b/seed/questions/DAILY_SINGLE_CHOICE_WEEKDAY_SYSTEM.md
index 54dce04b..f8e12689 100644
--- a/seed/questions/DAILY_SINGLE_CHOICE_WEEKDAY_SYSTEM.md
+++ b/seed/questions/DAILY_SINGLE_CHOICE_WEEKDAY_SYSTEM.md
@@ -554,6 +554,107 @@ Required tag:
 daily_sunday_slow_burn
 ```
 
+## Wildcard Mode (Surprise Days) — CONTENT NEEDED
+
+Wildcard is **not a weekday**. It is a surprise override that can land on **any** day.
+
+The app already promotes roughly **10% of days** to a "Wildcard" theme (it fires when the
+day-of-year mod 10 equals 3 — about 37 days a year). On those days the app shows the header
+**"Wildcard — The app has opinions"** with the action line **"Wildcard mission: say yes to one
+tiny weird idea."** Today there are **zero** wildcard questions, so those days silently show a
+normal weekday question under the Wildcard banner. This section defines the missing content.
+
+### Wildcard voice
+
+Playful, surprising, a little weird, low pressure. The feeling is *the app just picked something
+unexpected for the two of you.* Think tiny dares, silly "would you rather", spontaneous micro-plans,
+harmless chaos, "say yes to the odd option."
+
+Because a wildcard day can land on **any** weekday, wildcard questions must be **day-agnostic** —
+never reference Monday/Friday/the weekend or a specific weekday vibe. They must read well no matter
+which day they appear on.
+
+Same gates as the weekday packs (see Daily Fun Gate, Option Quality Standard, Banned Tone Words):
+quick, warm, PG-13 max on the free tier, 4 options preferred (4–6 allowed), single choice.
+
+### Wildcard counts
+
+* **12 free** `single_choice` wildcard questions. **Free only** — the daily picker never draws from
+  the premium pool, so premium wildcards would never be served. Do not author premium wildcards.
+* This is **in addition** to the existing 500 (75 free + 425 premium) weekday questions.
+
+### Wildcard IDs
+
+Continue the existing sequence so ids stay sortable and unique — the picker sorts by id:
+
+```text
+daily_single_choice_weekly_v1_501 … daily_single_choice_weekly_v1_512
+```
+
+### Wildcard tags (EXACT — this is an app contract)
+
+Every wildcard question must carry these tags, and **must NOT** carry any `weekday_*` tag or any
+weekday `mode_*` tag (a weekday mode tag would wrongly pull the wildcard into that weekday's pool):
+
+```json
+"tags": [
+  "daily",
+  "single_choice",
+  "best_fit",
+  "mode_wildcard",     // REQUIRED — the app selects wildcard questions on this EXACT tag.
+  "daily_wildcard",    // new-scheme weekday-style tag, kept for consistency
+  "quick_answer"
+]
+```
+
+> **`mode_wildcard` is non-negotiable.** The client (`DailyModeResolver.MODES["wildcard"].modeTag`)
+> and the server both filter on the literal string `mode_wildcard`. A wildcard question without this
+> exact tag is invisible to the wildcard picker.
+
+### Wildcard question schema (copy this shape)
+
+```json
+{
+  "id": "daily_single_choice_weekly_v1_501",
+  "category_id": "daily_fun_mc",
+  "type": "single_choice",
+  "text": "The app dares you: which tiny weird idea do we say yes to tonight?",
+  "depth": 1,
+  "access": "free",
+  "sex": "neutral",
+  "tags": ["daily", "single_choice", "best_fit", "mode_wildcard", "daily_wildcard", "quick_answer"],
+  "options": [
+    { "id": "swap_one_chore_for_a_dance", "text": "Swap one chore for a 2-song dance break" },
+    { "id": "dessert_for_dinner_experiment", "text": "Dessert-for-dinner experiment" },
+    { "id": "text_each_other_only_in_emoji", "text": "Only talk in emoji for an hour" },
+    { "id": "rename_the_wifi_together", "text": "Rename the wifi together, right now" }
+  ],
+  "answer_config": {
+    "options": [
+      { "id": "swap_one_chore_for_a_dance", "text": "Swap one chore for a 2-song dance break" },
+      { "id": "dessert_for_dinner_experiment", "text": "Dessert-for-dinner experiment" },
+      { "id": "text_each_other_only_in_emoji", "text": "Only talk in emoji for an hour" },
+      { "id": "rename_the_wifi_together", "text": "Rename the wifi together, right now" }
+    ],
+    "selection_style": "single"
+  }
+}
+```
+
+### After the JSON is authored — engineer rollout (NOT the content agent's job)
+
+Once the 12 wildcard questions are in `daily_fun_multiple_choice_v3.json`, an engineer lands them:
+
+1. **Asset DB:** insert the 12 rows into `app/src/main/assets/database/app.db` `question` table
+   **data-only** (`category_id='daily_fun_mc'`, `status='active'`, `is_premium=0`, `tags` containing
+   `mode_wildcard`). **Do NOT run `build_db.py`** — a full rebuild changes the Room identity hash and
+   breaks the shipped DB (see project notes). Data-only inserts are safe.
+2. **Firestore pointer docs:** seed one `questions/{id}` doc per wildcard question:
+   `{ questionId, modeTag: "mode_wildcard", active: true, isPremium: false, type: "single_choice",
+   source: "asset_db_daily_fun_mc", seededAt }`.
+3. **Deploy** the updated `assignDailyQuestion` function (the `mode_wildcard` picker branch is already
+   in code; until wildcard rows exist it safely falls back to the day's weekday question).
+
 ## Required Tags
 
 Each question must include exactly one new weekday tag:
@@ -565,6 +666,7 @@ Each question must include exactly one new weekday tag:
 * daily_friday_flirty
 * daily_saturday_side_quest
 * daily_sunday_slow_burn
+* daily_wildcard (wildcard surprise days — see Wildcard Mode above; pairs with the REQUIRED `mode_wildcard` app tag)
 
 If the app code still uses older mode tags, include the compatibility tag too, but only one new weekday tag.