diff --git a/main.cc b/main.cc
index ed6a602..b0c8595 100644
--- a/main.cc
+++ b/main.cc
@@ -43,6 +43,8 @@ main(int argc, char *argv[])
 	while (true) {
 		std::cout << "tick " << tick_id << '\n';
 
+		map.on_tick();
+
 		if (agent) {
 			agent->on_tick();
 			if (agent->conn && agent->conn->error) {
diff --git a/map.h b/map.h
index 3ed7095..16f31c1 100644
--- a/map.h
+++ b/map.h
@@ -54,6 +54,12 @@ public:
 		return *tiles[y * w + x];
 	};
 
+	void on_tick(void)
+	{
+		for (int i = 0; i < w * h; i++)
+			tiles[i]->on_tick();
+	}
+
 	void print_map(void);
 };