diff --git a/src/entities/entity.c b/src/entities/entity.c
index cede9dd..5cbe7ce 100644
--- a/src/entities/entity.c
+++ b/src/entities/entity.c
@@ -26,6 +26,7 @@ static void action(void);
 static void applyDamage(int damage);
 static float bounce(float x);
 static void tick(void);
+static void activate(int active);
 static void touch(Entity *other);
 static void animate(void);
 static void load(cJSON *root);
@@ -61,6 +62,7 @@ void initEntity(Entity *e)
 	e->animate = animate;
 	e->tick = tick;
 	e->touch = touch;
+	e->activate = activate;
 	e->applyDamage = applyDamage;
 	e->bounce = bounce;
 	e->getCurrentSprite = getCurrentSprite;
@@ -147,6 +149,10 @@ static void touch(Entity *other)
 {
 }
 
+static void activate(int active)
+{
+}
+
 static SDL_Rect *getCurrentSprite(void)
 {
 	return &self->sprite[self->facing]->frames[self->spriteFrame]->rect;
diff --git a/src/entities/structures/door.c b/src/entities/structures/door.c
index 7038816..f0bdf98 100644
--- a/src/entities/structures/door.c
+++ b/src/entities/structures/door.c
@@ -27,6 +27,7 @@ static void openWithKey(void);
 static int isClosed(void);
 static int isOpening(void);
 static int isClosing(void);
+static void activate(int active);
 static void load(cJSON *root);
 static void save(cJSON *root);
 
@@ -55,6 +56,7 @@ Entity *initDoor(void)
 	s->init = init;
 	s->tick = tick;
 	s->touch = touch;
+	s->activate = activate;
 	s->load = load;
 	s->save = save;
 	
@@ -266,6 +268,25 @@ static int isClosed(void)
 	return (s->state == DOOR_CLOSED && ((int) s->x == s->closedX && (int) s->y == s->closedY));
 }
 
+static void activate(int active)
+{
+	Structure *s = (Structure*)self;
+	
+	s->state = (s->state == DOOR_CLOSED) ? DOOR_OPEN : DOOR_CLOSED;
+
+	playSound(SND_DOOR_START, CH_MECHANICAL);
+
+	if (active)
+	{
+		observeActivation(self);
+
+		if (!isOnScreen(self))
+		{
+			setGameplayMessage(MSG_GAMEPLAY, "Door opened ...");
+		}
+	}
+}
+
 static void load(cJSON *root)
 {
 	Structure *s;
diff --git a/src/entities/structures/door.h b/src/entities/structures/door.h
index af447a8..3010bbb 100644
--- a/src/entities/structures/door.h
+++ b/src/entities/structures/door.h
@@ -30,6 +30,8 @@ extern void removeItem(char *name);
 extern Structure *createStructure(void);
 extern char *getLookupName(const char *prefix, long num);
 extern long lookup(const char *name);
+extern int isOnScreen(Entity *e);
+extern void observeActivation(Entity *e);
 
 extern Entity *self;
 extern Dev dev;
diff --git a/src/world/entities.c b/src/world/entities.c
index 6e106e6..e5d31bf 100644
--- a/src/world/entities.c
+++ b/src/world/entities.c
@@ -771,8 +771,29 @@ static int isObserving(void)
 	return 0;
 }
 
-void activateEntities(char *names, int activate)
+void activateEntities(char *names, int active)
 {
+	Entity *oldSelf;
+	char *name;
+	
+	oldSelf = self;
+
+	name = strtok(names, "|");
+
+	while (name)
+	{
+		for (self = world.entityHead.next ; self != NULL ; self = self->next)
+		{
+			if (strcmp(self->name, name) == 0)
+			{
+				self->activate(active);
+			}
+		}
+
+		name = strtok(NULL, "|");
+	}
+	
+	self = oldSelf;
 }
 
 void teleportEntity(Entity *e, float tx, float ty)
diff --git a/src/world/world.c b/src/world/world.c
index aa08516..5ab822c 100644
--- a/src/world/world.c
+++ b/src/world/world.c
@@ -478,10 +478,11 @@ void observeActivation(Entity *e)
 			{
 				world.entitiesToObserve[i] = e;
 				world.observationTimer = FPS * 2;
+				return;
 			}
 		}
+		
+		SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_ERROR, "Can't observe entity - out of array space");
+		exit(1);
 	}
-
-	SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_ERROR, "Can't observe entity - out of array space");
-	exit(1);
 }