diff --git a/src/saland/Game.cpp b/src/saland/Game.cpp
index 7319e86..7863a88 100644
--- a/src/saland/Game.cpp
+++ b/src/saland/Game.cpp
@@ -641,7 +641,7 @@ void Game::Update() {
 		}
 		Monster* monster = dynamic_cast<Monster*> (entity.get());
 		if (monster) {
-			UpdateMonster(monster, deltaTime);
+			UpdateMonster(monster, deltaTime, data->human->X, data->human->Y);
 		}
 		MiscItem* item = dynamic_cast<MiscItem*> (entity.get());
 		if (item) {
diff --git a/src/saland/GameUpdates.cpp b/src/saland/GameUpdates.cpp
index 47a406c..d8947f0 100644
--- a/src/saland/GameUpdates.cpp
+++ b/src/saland/GameUpdates.cpp
@@ -22,6 +22,8 @@ https://github.com/sago007/saland
 */
 
 #include "GameUpdates.hpp"
+#include <cmath>
+#include <cstdlib>
 
 static void SetDesiredVelocity(b2Body* body, float x, float y) {
 	b2Vec2 vel = body->GetLinearVelocity();
@@ -80,25 +82,54 @@ void UpdateHuman(Human* entity, float fDeltaTime) {
 	entity->Y = place.y*pixel2unit;
 }
 
-static void MonsterThink(Monster* entity) {
-	if (rand()%2==0) {
-		//1 in 2 chance of changing direction
-		if (rand()%2==0) {
-			entity->moveX = 0.1f;
-		}
-		else {
-			entity->moveX = -0.1f;
-		}
-		if (rand()%2 == 0) {
-			entity->moveY = 0.1f;
-		}
-		else {
-			entity->moveY = -0.1f;
-		}
+static void MonsterThink(Monster* entity, float playerX, float playerY) {
+	switch (entity->aiState) {
+		case Monster::State::Roaming:
+			// Random wandering behavior
+			if (rand()%2==0) {
+				//1 in 2 chance of changing direction
+				if (rand()%2==0) {
+					entity->moveX = 0.1f;
+				}
+				else {
+					entity->moveX = -0.1f;
+				}
+				if (rand()%2 == 0) {
+					entity->moveY = 0.1f;
+				}
+				else {
+					entity->moveY = -0.1f;
+				}
+			}
+			break;
+		case Monster::State::Aggressive:
+			// Move towards player
+			{
+				float dirX = playerX - entity->X;
+				float dirY = playerY - entity->Y;
+				float length = std::sqrt(dirX * dirX + dirY * dirY);
+				if (length > 0.01f) {
+					entity->moveX = (dirX / length) * entity->speed;
+					entity->moveY = (dirY / length) * entity->speed;
+				}
+			}
+			break;
+		case Monster::State::Fleeing:
+			// Move away from player
+			{
+				float dirX = entity->X - playerX;
+				float dirY = entity->Y - playerY;
+				float length = std::sqrt(dirX * dirX + dirY * dirY);
+				if (length > 0.01f) {
+					entity->moveX = (dirX / length) * entity->speed * 1.2f; // Flee slightly faster
+					entity->moveY = (dirY / length) * entity->speed * 1.2f;
+				}
+			}
+			break;
 	}
 }
 
-void UpdateMonster(Monster* entity, float fDeltaTime) {
+void UpdateMonster(Monster* entity, float fDeltaTime, float playerX, float playerY) {
 	SetCreatureMovementEntity(entity, entity->moveX, entity->moveY);
 	b2Vec2 place = entity->body->GetPosition();
 	entity->X = place.x*pixel2unit;
@@ -108,7 +139,7 @@ void UpdateMonster(Monster* entity, float fDeltaTime) {
 	}
 	else {
 		entity->aiNextThink = 2000.0f;
-		MonsterThink(entity);
+		MonsterThink(entity, playerX, playerY);
 	}
 	if (entity->health <= 0.0) {
 		entity->removeMe = true;
@@ -126,7 +157,7 @@ void UpdateProjectile(Projectile* entity, float fDeltaTime) {
 }
 
 void ProjectileHit(Projectile* p, Placeable* target) {
-	//Monster* monster = dynamic_cast<Monster*> (target);
+	Monster* monster = dynamic_cast<Monster*> (target);
 	if (target->destructible) {
 		float damageAmount = p->damage.getDamage();
 		target->health -= damageAmount;
@@ -140,4 +171,8 @@ void ProjectileHit(Projectile* p, Placeable* target) {
 		dmg.createdAt = SDL_GetTicks();
 		target->damageNumbers.push_back(dmg);
 	}
+	if (monster) {
+		// Potentially change monster state to aggressive
+		monster->aiState = Monster::State::Aggressive;
+	}
 }
\ No newline at end of file
diff --git a/src/saland/GameUpdates.hpp b/src/saland/GameUpdates.hpp
index e164aa6..8995f36 100644
--- a/src/saland/GameUpdates.hpp
+++ b/src/saland/GameUpdates.hpp
@@ -31,7 +31,7 @@ https://github.com/sago007/saland
 
 void ProjectileHit(Projectile* p, Placeable* target);
 void UpdateHuman(Human* entity, float fDeltaTime);
-void UpdateMonster(Monster* entity, float fDeltaTime);
+void UpdateMonster(Monster* entity, float fDeltaTime, float playerX, float playerY);
 void UpdateProjectile(Projectile* entity, float fDeltaTime);
 
 #endif /* GAMEUPDATES_HPP */
diff --git a/src/saland/model/placeables.hpp b/src/saland/model/placeables.hpp
index 51b23cb..b665c1c 100644
--- a/src/saland/model/placeables.hpp
+++ b/src/saland/model/placeables.hpp
@@ -106,10 +106,18 @@ public:
 
 class Monster : public Creature {
 public:
+	enum class State {
+		Roaming,
+		Aggressive,
+		Fleeing
+	};
 	std::string race = "bat";
 	float speed = 1.0f;
 	// AI logic:
 	float aiNextThink = 0.0;
+	State aiState = State::Roaming;
+	float targetX = 0.0f; // Used for fleeing direction
+	float targetY = 0.0f;
 };