try generating spaces multiple times if they don't contain any puzzle modules

Assets/Engine/Runtime/Engine.cs

@@ -27,6 +27,8 @@ namespace EscapeRoomEngine.Engine.Runtime
         public delegate void UpdateUIHandler();
         public event UpdateUIHandler UpdateUIEvent;
 
+        [InfoBox("If a space was generated without any puzzles in it, the engine will try generating another new space. To prevent infinite loops, the amount of retries is bound.")]
+        public int maxSpaceGenerationTries;
         [Required] public EngineTheme theme;
 
         public int NumberOfRooms => _rooms.Count;
@@ -68,22 +70,39 @@ namespace EscapeRoomEngine.Engine.Runtime
 
         private void GenerateSpace(Room room, Passage entrance)
         {
-            Logger.Log("Generating space...", LogType.RoomGeneration);
+            var puzzlesAdded = 0;
+            var tries = 0;
+            Space space;
+            Passage exit;
             
-            // create space
+            do
-            var space = new Space(room, entrance);
-            
-            // add exit
-            var exitDoor = new DoorModule(space, theme.exitDoorTypes.RandomElement());
-            if (!space.AddModuleWithRequirements(exitDoor))
-                throw new EngineException("Could not satisfy requirements for exit door.");
-            var exit = new Passage(exitDoor);
-
-            // add puzzles
-            var puzzleCount = Utilities.Utilities.RandomInclusive(theme.puzzleCount.x, theme.puzzleCount.y);
-            for (var i = 0; i < puzzleCount; i++)
             {
-                space.AddModuleWithRequirements(Module.CreateModuleByType(space, theme.puzzleTypes.RandomElement()));
+                tries++;
+                Logger.Log($"Generating space{(tries > 1 ? $" (try {tries})" : "")}...", LogType.RoomGeneration);
+
+                // create space
+                space = new Space(room, entrance);
+
+                // add exit
+                var exitDoor = new DoorModule(space, theme.exitDoorTypes.RandomElement());
+                if (!space.AddModuleWithRequirements(exitDoor))
+                    throw new EngineException("Could not satisfy requirements for exit door.");
+                exit = new Passage(exitDoor);
+
+                // add puzzles
+                var puzzleCount = Utilities.Utilities.RandomInclusive(theme.puzzleCount.x, theme.puzzleCount.y);
+                for (var i = 0; i < puzzleCount; i++)
+                {
+                    if (space.AddModuleWithRequirements(Module.CreateModuleByType(space, theme.puzzleTypes.RandomElement())))
+                    {
+                        puzzlesAdded++;
+                    }
+                }
+            } while (puzzlesAdded == 0 && tries < maxSpaceGenerationTries);
+
+            if (puzzlesAdded == 0)
+            {
+                Logger.Log($"Unable to create space with puzzles after {tries} tries", LogType.Important);
             }
             
             room.AddSpace(space, exit);

Assets/Scenes/TestScene.unity

@@ -1619,6 +1619,7 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: 9a9b6b8b557abbb4ab172444615ebf23, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
+  maxSpaceGenerationTries: 10
   theme: {fileID: 11400000, guid: 568d9a7d70f3edb4cb6db66a0010f105, type: 2}
 --- !u!4 &1568048335
 Transform: