diff --git a/DorkNet.Server/Controllers/Admin/AdminController.cs b/DorkNet.Server/Controllers/Admin/AdminController.cs
index 298bde0..f95e432 100644
--- a/DorkNet.Server/Controllers/Admin/AdminController.cs
+++ b/DorkNet.Server/Controllers/Admin/AdminController.cs
@@ -975,7 +975,8 @@ public class AdminController(
         double? HotScore,
         int? State,
         string? ImageName,
-        int? MaxCapacity);
+        int? MaxCapacity,
+        bool? IsAGRoom);
 
     /// <summary>POST <c>api/admin/v1/rooms/{id}/props</c> — partial
     /// update of room properties. Only the non-null fields in the
@@ -1005,6 +1006,20 @@ public class AdminController(
             room.MaxCapacity = Math.Clamp(cap, 1, 80);
             changes.Add($"maxCapacity={room.MaxCapacity}");
         }
+        if (body.IsAGRoom is bool ag)
+        {
+            // IsAGRoom is what the client reads as IsRRO. True: load the
+            // baked scene from the client's own assets AND consult the
+            // client-baked AGRoomRuntimeConfig table (which, per original,
+            // decides e.g. whether creation is allowed — Rec Center yes, Rec
+            // Royale no). False: treat the room as a custom room (roles and
+            // blob decide everything). Flipping a CLONE of a baked original
+            // to false is the server-side experiment for "editable Rec
+            // Royale"; whether the client still loads the baked scene for a
+            // non-original is what that experiment answers.
+            room.IsAGRoom = ag;
+            changes.Add($"isAGRoom={ag}");
+        }
 
         if (changes.Count == 0) return Ok(new { room.Id, unchanged = true });
 
diff --git a/DorkNet.Server/admin-ui/src/pages/Room.tsx b/DorkNet.Server/admin-ui/src/pages/Room.tsx
index 395ddf8..4a6eae7 100644
--- a/DorkNet.Server/admin-ui/src/pages/Room.tsx
+++ b/DorkNet.Server/admin-ui/src/pages/Room.tsx
@@ -165,6 +165,7 @@ function GeneralTab({ room, onSaved }: { room: RoomDetail; onSaved: () => void }
   const [description, setDescription] = useState(room.description);
   const [accessibility, setAccessibility] = useState(room.accessibility);
   const [cloningAllowed, setCloningAllowed] = useState(room.cloningAllowed);
+  const [isAGRoom, setIsAGRoom] = useState(room.isAGRoom);
   const [tagsCsv, setTagsCsv] = useState(room.tagsCsv);
   const [hotScore, setHotScore] = useState(String(room.hotScore));
   const [imageName, setImageName] = useState(room.imageName);
@@ -176,6 +177,7 @@ function GeneralTab({ room, onSaved }: { room: RoomDetail; onSaved: () => void }
     setDescription(room.description);
     setAccessibility(room.accessibility);
     setCloningAllowed(room.cloningAllowed);
+    setIsAGRoom(room.isAGRoom);
     setTagsCsv(room.tagsCsv);
     setHotScore(String(room.hotScore));
     setImageName(room.imageName);
@@ -193,6 +195,7 @@ function GeneralTab({ room, onSaved }: { room: RoomDetail; onSaved: () => void }
           Description: description,
           Accessibility: accessibility,
           CloningAllowed: cloningAllowed,
+          IsAGRoom: isAGRoom,
           TagsCsv: tagsCsv,
           HotScore: Number.isFinite(hot) ? hot : undefined,
           ImageName: imageName,
@@ -283,6 +286,14 @@ function GeneralTab({ room, onSaved }: { room: RoomDetail; onSaved: () => void }
         />
         <span>Cloning allowed</span>
       </label>
+      <label className="flex items-center gap-2 text-sm" title="What the client reads as IsRRO. On: load the baked scene from the client's assets and consult the client's built-in per-original table (which forbids creation in Rec Royale). Off: treat as a custom room — roles and blob decide. Flip a CLONE of an original off to test editable Rec Royale.">
+        <input
+          type="checkbox"
+          checked={isAGRoom}
+          onChange={e => setIsAGRoom(e.target.checked)}
+        />
+        <span>Rec Room Original (IsRRO) — baked scene + client creation table</span>
+      </label>
       <div className="flex gap-2 pt-2 border-t border-ink-800">
         <button onClick={save} disabled={busy} className="btn-primary text-xs">
           {busy ? 'Saving…' : 'Save changes'}
diff --git a/docs/admin.md b/docs/admin.md
index 620d2a6..01c1c45 100644
--- a/docs/admin.md
+++ b/docs/admin.md
@@ -279,6 +279,24 @@ Procedure that makes Rec Royale playable AND editable:
 
 Tests: `RroRoomBlobTests`.
 
+### Why Rec Royale still has no Maker Pen after all of the above
+
+The Maker Pen permission check (`AGMBHDNGOEH.IJEIEBGJJLB`) first runs a
+room precondition (`LALJEMHEIBH`) that, via `MLKAFHHHEGA.GHPIBJPNOFF` →
+`PNPLLCBBMJP.JGPBNEHFLJA`, looks the current room up in
+`AGRoomRuntimeConfig` — a table **baked into the client's
+`resources.assets`** — and returns a per-original boolean. Rec Center and
+Stunt Runner allow creation there; Rec Royale does not. No blob, role or
+server response changes that table, and it is consulted only for rooms the
+client considers originals (`IsRRO` = our `IsAGRoom`).
+
+Server-side experiment: clone Rec Royale, flip the clone's **Rec Room
+Original (IsRRO)** checkbox off on the General tab
+(`rooms/{id}/props` `IsAGRoom: false`), upload a real save to it, join. If
+the client still loads the Frontier scene for a non-original, Rec Royale
+becomes an editable template; if the scene fails to load, the table gate
+has to be bypassed client-side (ClientMod postfix on `GHPIBJPNOFF`).
+
 ## Test cases ↔ GitHub issues
 
 QA test cases can file and track GitHub issues. Configure with: