diff --git a/Ideen.md b/Ideen.md
index 5d12265..14c9e23 100644
--- a/Ideen.md
+++ b/Ideen.md
@@ -1,6 +1,5 @@
 # MUSS
 
-- api: Config-Liste von Extra-Türchen (kein Buchstabe, nur manuelles Bild)
 
 # KANN
 
@@ -21,3 +20,4 @@
 - api: admin Login case sensitivity (username "admin" == "AdMiN")
 - api: `config.solution` - whitespace="IGNORE"->"REMOVE" umbenennen, +Sonderzeichen
 - api: Config-Option "Überspringe leere Türchen" (standard ja)
+- api: Config-Liste von Extra-Türchen (kein Buchstabe, nur manuelles Bild)
diff --git a/api/advent22_api/core/config.py b/api/advent22_api/core/config.py
index a518166..8811661 100644
--- a/api/advent22_api/core/config.py
+++ b/api/advent22_api/core/config.py
@@ -34,9 +34,6 @@ class Site(BaseModel):
 
 
 class Puzzle(BaseModel):
-    # Türchen ohne Buchstabe überspringen
-    skip_empty: bool = True
-
     # Tag, an dem der Kalender startet
     begin_day: int = 1
 
@@ -46,6 +43,12 @@ class Puzzle(BaseModel):
     # Kalender so viele Tage nach der letzten Türöffnung schließen
     close_after: int = 90
 
+    # Tage, für die kein Buchstabe vorgesehen wird
+    extra_days: set[int] = set()
+
+    # Türchen ohne Buchstabe überspringen
+    skip_empty: bool = True
+
 
 class Image(BaseModel):
     # Quadrat, Seitenlänge in px
diff --git a/api/advent22_api/core/depends.py b/api/advent22_api/core/depends.py
index 5a8f26a..dd28a8b 100644
--- a/api/advent22_api/core/depends.py
+++ b/api/advent22_api/core/depends.py
@@ -1,5 +1,4 @@
 import re
-from collections import defaultdict
 from dataclasses import dataclass
 from datetime import date
 from io import BytesIO
@@ -42,6 +41,11 @@ async def get_all_parts(
     Lösung auf vorhandene Tage aufteilen
     """
 
+    # noch keine Buchstaben verteilt
+    result = {day: "" for day in days}
+    # extra-Tage ausfiltern
+    days = [day for day in days if day not in cfg.puzzle.extra_days]
+
     solution_length = len(cfg.solution.clean)
     num_days = len(days)
 
@@ -55,12 +59,9 @@ async def get_all_parts(
         *rnd.sample(days, solution_length % num_days),
     ]
 
-    result: defaultdict[int, str] = defaultdict(str)
     for day, letter in zip(solution_days, cfg.solution.clean):
         result[day] += letter
 
-    result |= {missed_day: "" for missed_day in set(days) - set(result.keys())}
-
     return result
 
 
@@ -74,7 +75,7 @@ async def get_all_event_dates(
     """
 
     if cfg.puzzle.skip_empty:
-        days = [day for day in days if parts[day] != ""]
+        days = [day for day in days if parts[day] != "" or day in cfg.puzzle.extra_days]
 
     return EventDates(
         today=date.today(),
diff --git a/api/advent22_api/routers/admin.py b/api/advent22_api/routers/admin.py
index aef84ee..ee5bb4b 100644
--- a/api/advent22_api/routers/admin.py
+++ b/api/advent22_api/routers/admin.py
@@ -36,12 +36,13 @@ class AdminConfigModel(BaseModel):
         clean: str
 
     class __Puzzle(BaseModel):
-        skip_empty: bool
         first: date
         next: date | None
         last: date
         end: date
         seed: str
+        extra_days: list[int]
+        skip_empty: bool
 
     class __Calendar(BaseModel):
         config_file: str
@@ -88,12 +89,13 @@ async def get_config_model(
                 "clean": cfg.solution.clean,
             },
             "puzzle": {
-                "skip_empty": cfg.puzzle.skip_empty,
                 "first": event_dates.first,
                 "next": event_dates.next,
                 "last": event_dates.last,
                 "end": event_dates.end,
                 "seed": cfg.random_seed,
+                "extra_days": sorted(cfg.puzzle.extra_days),
+                "skip_empty": cfg.puzzle.skip_empty,
             },
             "calendar": {
                 "config_file": cfg.calendar,
diff --git a/ui/src/components/admin/ConfigView.vue b/ui/src/components/admin/ConfigView.vue
index dad5218..d0ce3db 100644
--- a/ui/src/components/admin/ConfigView.vue
+++ b/ui/src/components/admin/ConfigView.vue
@@ -69,6 +69,19 @@
                 "{{ admin_config_model.puzzle.seed }}"
               </dd>
 
+              <dt>Extra-Tage</dt>
+              <dd>
+                <template
+                  v-for="(day, index) in admin_config_model.puzzle.extra_days"
+                  :key="`extra_day-${index}`"
+                >
+                  <span>
+                    <template v-if="index > 0">, </template>
+                    {{ day }}
+                  </span>
+                </template>
+              </dd>
+
               <dt>Leere Türchen</dt>
               <dd v-if="admin_config_model.puzzle.skip_empty">Überspringen</dd>
               <dd v-else>Anzeigen</dd>
@@ -199,12 +212,13 @@ export default class extends Vue {
       clean: "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
     },
     puzzle: {
-      skip_empty: true,
       first: "2023-12-01",
       next: "2023-12-01",
       last: "2023-12-24",
       end: "2024-04-01",
       seed: "",
+      extra_days: [],
+      skip_empty: true,
     },
     calendar: {
       config_file: "lorem ipsum",
diff --git a/ui/src/lib/api.ts b/ui/src/lib/api.ts
index aebd642..47604a8 100644
--- a/ui/src/lib/api.ts
+++ b/ui/src/lib/api.ts
@@ -7,12 +7,13 @@ export interface AdminConfigModel {
     clean: string;
   };
   puzzle: {
-    skip_empty: boolean;
     first: string;
     next: string | null;
     last: string;
     end: string;
     seed: string;
+    extra_days: number[];
+    skip_empty: boolean;
   };
   calendar: {
     config_file: string;