1 files changed, 7 insertions, 3 deletions

@@ -225,9 +225,13 @@ std::string Panel::Write() {
   }
 
   serializer.writeInt(0);
-  serializer.writeByte(Serializer::NegationsCancelNegations |
-                       Serializer::PrecisePolyominos |
-                       Serializer::FlashForErrors);
+
+  char settings = Serializer::NegationsCancelNegations |
+                  Serializer::PrecisePolyominos | Serializer::FlashForErrors;
+  if (_invisible_symmetry) {
+    settings |= Serializer::InvisibleSymmetry;
+  }
+  serializer.writeByte(settings);
 
   return serializer.str();
 }