fix end terminal pluralisation

Assets/Engine/Runtime/Measurements/Measure.cs

@@ -18,7 +18,7 @@ namespace EscapeRoomEngine.Engine.Runtime.Measurements
         /// </summary>
         public static bool Store { get; set; }
         public static bool PreferLessPlayed => GameControl.Instance.preferLessPlayed.Value;
-        public static int PuzzlesSolved => _currentSession.PuzzlesSolved.Count;
+        public static int PuzzlesSolved { get; private set; }
         
         private static Dictionary<int, PuzzleMeasurement> _runningMeasurements;
         private static Session _currentSession;
@@ -97,6 +97,7 @@ namespace EscapeRoomEngine.Engine.Runtime.Measurements
                 PuzzleStorage.Instance.EndMeasurement(_currentSession, puzzle, measurement);
             }
             _runningMeasurements.Remove(puzzle.Id);
+            PuzzlesSolved++;
             
             Logger.Log($"Solved {puzzle} with measurement {measurement}", LogType.Measuring);
         }