diff --git a/.gitignore b/.gitignore
index 86732f5..157050f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 !README.md
 !*.py
 !*.h
+!*.mk
diff --git a/Makefile b/Makefile
index bf1e2c6..4db3ffc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,10 @@
 CFLAGS=-Wall -g
 
-EXERCISES = $(patsubst %.c,%,$(shell ls ex*.c))
+EXERCISES = $(patsubst %.c,%,$(shell ls ex*.c | grep -v ex19))
 
 
 all: $(EXERCISES)
+	$(MAKE) -f ex19.mk
 
 
 clean:
diff --git a/ex19.h b/ex19.h
new file mode 100644
index 0000000..0131465
--- /dev/null
+++ b/ex19.h
@@ -0,0 +1,54 @@
+#ifndef _ex19_h
+#define _ex19_h
+
+#include "object.h"
+
+
+struct Monster {
+    Object proto;
+    int hit_points;
+};
+
+
+typedef struct Monster Monster;
+
+
+int Monster_attack(void *self, int damage);
+int Monster_init(void *self);
+
+
+struct Room {
+    Object proto;
+
+    Monster *bad_guy;
+
+    struct Room *north;
+    struct Room *south;
+    struct Room *east;
+    struct Room *west;
+};
+
+
+typedef struct Room Room;
+
+
+void *Room_move(void *self, Direction direction);
+int Room_attack(void *self, int damage);
+int Room_init(void *self);
+
+
+struct Map {
+    Object proto;
+    Room *start;
+    Room *location;
+};
+
+
+typedef struct Map Map;
+
+
+void *Map_move(void *self, Direction direction);
+int Map_attack(void *self, int damage);
+int Map_init(void *self);
+
+#endif
diff --git a/ex19.mk b/ex19.mk
new file mode 100644
index 0000000..aea800f
--- /dev/null
+++ b/ex19.mk
@@ -0,0 +1,8 @@
+CFLAGS=-Wall -g
+
+all: ex19
+
+ex19: object.o
+
+clean:
+	rm -f ex19