diff --git a/api/advent22_api/core/depends.py b/api/advent22_api/core/depends.py
index c9bf5f1..7925258 100644
--- a/api/advent22_api/core/depends.py
+++ b/api/advent22_api/core/depends.py
@@ -5,6 +5,7 @@ from fastapi import Depends
 from PIL import Image, ImageFont
 
 from .advent_image import _XY, AdventImage
+from .calendar_config import CalendarConfig, get_calendar_config
 from .config import Config, get_config
 from .image_helpers import list_images_auto, load_image
 from .sequence_helpers import Random, set_len, shuffle
@@ -21,6 +22,41 @@ async def shuffle_solution(
     return "".join(await shuffle(cfg.puzzle.solution))
 
 
+async def get_days(
+    cal_cfg: CalendarConfig = Depends(get_calendar_config),
+) -> list[int]:
+    """
+    Alle Tage, für die es ein Türchen gibt
+    """
+
+    return list(set(door.day for door in cal_cfg.doors))
+
+
+async def get_solution_parts(
+    cfg: Config = Depends(get_config),
+    days: list[int] = Depends(get_days),
+) -> dict[int, set[str]]:
+    """
+    Lösung auf vorhandene Tage aufteilen
+    """
+
+    solution_length = len(cfg.puzzle.solution)
+    num_days = len(days)
+
+    rnd = await Random.get()
+    solution_days = [
+        *rnd.shuffled(days * (solution_length // num_days)),
+        *rnd.sample(days, solution_length % num_days),
+    ]
+
+    result: dict[int, set[str]] = {}
+    for day, letter in zip(solution_days, cfg.puzzle.solution):
+        result[day] = result.get(day, set())
+        result[day].add(letter)
+
+    return result
+
+
 async def shuffle_images_auto(
     images: list[str] = Depends(list_images_auto),
 ) -> list[str]:
diff --git a/api/advent22_api/core/sequence_helpers.py b/api/advent22_api/core/sequence_helpers.py
index a4911d0..477c1b6 100644
--- a/api/advent22_api/core/sequence_helpers.py
+++ b/api/advent22_api/core/sequence_helpers.py
@@ -1,9 +1,11 @@
 import itertools
 import random
-from typing import Any, Self, Sequence
+from typing import Any, Self, Sequence, TypeVar
 
 from .config import get_config
 
+T = TypeVar("T")
+
 
 class Random(random.Random):
     @classmethod
@@ -11,6 +13,9 @@ class Random(random.Random):
         cfg = await get_config()
         return cls(f"{cfg.puzzle.solution}{cfg.puzzle.random_seed}{bonus_salt}")
 
+    def shuffled(self, population: Sequence[T]) -> Sequence[T]:
+        return self.sample(population, k=len(population))
+
 
 async def shuffle(seq: Sequence, rnd: random.Random | None = None) -> list:
     # Zufallsgenerator
diff --git a/api/advent22_api/routers/admin.py b/api/advent22_api/routers/admin.py
index ddcdde3..b0be7a9 100644
--- a/api/advent22_api/routers/admin.py
+++ b/api/advent22_api/routers/admin.py
@@ -5,13 +5,20 @@ from pydantic import BaseModel
 
 from ..core.calendar_config import CalendarConfig, get_calendar_config
 from ..core.config import Config, get_config
-from ..core.depends import shuffle_solution
+from ..core.depends import get_solution_parts, shuffle_solution
 from ..core.settings import SETTINGS
 from ._security import require_admin, user_is_admin
 
 router = APIRouter(prefix="/admin", tags=["admin"])
 
 
+@router.get("/parts")
+async def get_parts(
+    shuffle=Depends(get_solution_parts),
+) -> dict[int, set[str]]:
+    return shuffle
+
+
 @router.get("/is_admin")
 async def is_admin(
     is_admin: bool = Depends(user_is_admin),