diff --git a/Assets/Scripts/AIBehaviour.cs b/Assets/Scripts/AIBehaviour.cs
new file mode 100644
index 0000000..b182b89
--- /dev/null
+++ b/Assets/Scripts/AIBehaviour.cs
@@ -0,0 +1,298 @@
+using UnityEngine;
+using UnityEngine.AI;
+
+/// <summary>
+/// Call of Duty Zombies-style enemy AI.
+/// States: Seeking (chase player) → BreakingBarrier (hammer a blocked door/window) → Attacking (melee the player)
+///
+/// Setup requirements:
+///   - NavMeshAgent on this GameObject
+///   - Player GameObject tagged "Player" with a PlayerHealth component
+///   - Barrier objects on a layer assigned to barrierLayer, with a Barrier component + NavMeshObstacle (carving on)
+/// </summary>
+[RequireComponent(typeof(NavMeshAgent))]
+public class AIBehaviour : MonoBehaviour
+{
+    public enum ZombieState { Seeking, BreakingBarrier, Attacking, Dead }
+
+    // -------------------------------------------------------------------------
+    //  Inspector
+    // -------------------------------------------------------------------------
+    [Header("Movement")]
+    public float moveSpeed = 3.5f;
+    public float acceleration = 12f;
+
+    [Header("Attack — Player")]
+    public float attackRange = 1.8f;
+    public float attackDamage = 15f;
+    [Tooltip("Attacks per second")] public float attackRate = 1f;
+
+    [Header("Attack — Barrier")]
+    public float barrierDetectRange = 1.6f;
+    public float barrierDamage = 25f;
+    [Tooltip("Barrier hits per second")] public float barrierAttackRate = 1.5f;
+    public LayerMask barrierLayer;
+
+    [Header("Health")]
+    public float maxHealth = 100f;
+
+    [Header("Animation (optional)")]
+    public Animator animator;
+
+    // -------------------------------------------------------------------------
+    //  Private state
+    // -------------------------------------------------------------------------
+    private NavMeshAgent _agent;
+    private Transform _player;
+    private PlayerHealth _playerHealth;
+    private ZombieState _state = ZombieState.Seeking;
+    private float _health;
+    private float _attackTimer;
+    private float _barrierTimer;
+    private Barrier _targetBarrier;
+
+    // -------------------------------------------------------------------------
+    //  Lifecycle
+    // -------------------------------------------------------------------------
+    void Awake()
+    {
+        _agent = GetComponent<NavMeshAgent>();
+        _agent.speed = moveSpeed;
+        _agent.acceleration = acceleration;
+        _agent.stoppingDistance = attackRange * 0.85f;
+        _agent.autoBraking = true;
+        _health = maxHealth;
+    }
+
+    void Start()
+    {
+        GameObject playerObj = GameObject.FindGameObjectWithTag("Player");
+        if (playerObj != null)
+        {
+            _player       = playerObj.transform;
+            _playerHealth = playerObj.GetComponent<PlayerHealth>();
+        }
+        else
+        {
+            Debug.LogWarning("[ZombieAI] No GameObject tagged 'Player' found.");
+        }
+    }
+
+    void Update()
+    {
+        if (_state == ZombieState.Dead || _player == null) return;
+
+        _attackTimer  -= Time.deltaTime;
+        _barrierTimer -= Time.deltaTime;
+
+        switch (_state)
+        {
+            case ZombieState.Seeking:         UpdateSeeking();         break;
+            case ZombieState.BreakingBarrier: UpdateBreakingBarrier(); break;
+            case ZombieState.Attacking:       UpdateAttacking();       break;
+        }
+
+        UpdateAnimator();
+    }
+
+    // -------------------------------------------------------------------------
+    //  Seeking — navigate toward the player, detect barriers blocking the path
+    // -------------------------------------------------------------------------
+    void UpdateSeeking()
+    {
+        float dist = Vector3.Distance(transform.position, _player.position);
+
+        // Close enough to swing
+        if (dist <= attackRange)
+        {
+            _agent.ResetPath();
+            TransitionTo(ZombieState.Attacking);
+            return;
+        }
+
+        // Keep chasing
+        _agent.SetDestination(_player.position);
+
+        // If the NavMesh path can't reach the player, a barrier may be blocking
+        if (_agent.pathStatus == NavMeshPathStatus.PathPartial ||
+            _agent.pathStatus == NavMeshPathStatus.PathInvalid)
+        {
+            Barrier b = ScanForBarrierAhead();
+            if (b != null)
+            {
+                _targetBarrier = b;
+                _agent.ResetPath();
+                TransitionTo(ZombieState.BreakingBarrier);
+                return;
+            }
+        }
+
+        // Also do a short spherecast while moving in case the path is briefly valid
+        // but a barrier is right in front of us (tight corridor)
+        if (_agent.velocity.magnitude > 0.2f)
+        {
+            Barrier bAhead = ScanForBarrierAhead();
+            if (bAhead != null)
+            {
+                _targetBarrier = bAhead;
+                _agent.ResetPath();
+                TransitionTo(ZombieState.BreakingBarrier);
+            }
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    //  Breaking barrier — face it and hammer until it falls
+    // -------------------------------------------------------------------------
+    void UpdateBreakingBarrier()
+    {
+        // Barrier was destroyed (by us or another zombie)
+        if (_targetBarrier == null || _targetBarrier.IsDestroyed)
+        {
+            _targetBarrier = null;
+            TransitionTo(ZombieState.Seeking);
+            return;
+        }
+
+        // Face the barrier
+        FaceTarget(_targetBarrier.transform.position);
+
+        // Hit on cooldown
+        if (_barrierTimer <= 0f)
+        {
+            _targetBarrier.TakeDamage(barrierDamage);
+            _barrierTimer = 1f / barrierAttackRate;
+            TriggerAnimatorTrigger("BarrierHit");
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    //  Attacking — melee the player
+    // -------------------------------------------------------------------------
+    void UpdateAttacking()
+    {
+        float dist = Vector3.Distance(transform.position, _player.position);
+
+        // Player escaped melee range — resume chase
+        if (dist > attackRange + 0.6f)
+        {
+            TransitionTo(ZombieState.Seeking);
+            return;
+        }
+
+        FaceTarget(_player.position);
+
+        if (_attackTimer <= 0f)
+        {
+            PlayerHealth ph = _player.GetComponent<PlayerHealth>();
+            if (ph != null) ph.TakeDamage(attackDamage);
+            _attackTimer = 1f / attackRate;
+            TriggerAnimatorTrigger("Attack");
+        }
+    }
+
+    // -------------------------------------------------------------------------
+    //  Public API — take damage / die
+    // -------------------------------------------------------------------------
+    public void TakeDamage(float damage)
+    {
+        if (_state == ZombieState.Dead) return;
+        _health -= damage;
+        if (_health <= 0f) Die();
+    }
+
+    void Die()
+    {
+        TransitionTo(ZombieState.Dead);
+        _agent.ResetPath();
+        _agent.enabled = false;
+        TriggerAnimatorTrigger("Die");
+        Destroy(gameObject, 3f);
+    }
+
+    // -------------------------------------------------------------------------
+    //  Helpers
+    // -------------------------------------------------------------------------
+
+    /// Spherecast in the direction of movement to find a Barrier collider.
+    Barrier ScanForBarrierAhead()
+    {
+        Vector3 origin = transform.position + Vector3.up * 0.8f;
+        Vector3 dir    = _agent.desiredVelocity.magnitude > 0.1f
+                         ? _agent.desiredVelocity.normalized
+                         : transform.forward;
+
+        if (Physics.SphereCast(origin, 0.45f, dir, out RaycastHit hit,
+                               barrierDetectRange, barrierLayer,
+                               QueryTriggerInteraction.Ignore))
+        {
+            Barrier b = hit.collider.GetComponentInParent<Barrier>();
+            if (b != null && !b.IsDestroyed)
+                return b;
+        }
+        return null;
+    }
+
+    void FaceTarget(Vector3 targetPos)
+    {
+        Vector3 dir = (targetPos - transform.position);
+        dir.y = 0f;
+        if (dir.sqrMagnitude < 0.001f) return;
+        Quaternion target = Quaternion.LookRotation(dir);
+        transform.rotation = Quaternion.Slerp(transform.rotation, target, 10f * Time.deltaTime);
+    }
+
+    void TransitionTo(ZombieState next)
+    {
+        _state = next;
+    }
+
+    // -------------------------------------------------------------------------
+    //  Animator bridge — all parameters are optional; missing params are ignored
+    // -------------------------------------------------------------------------
+    void UpdateAnimator()
+    {
+        if (animator == null) return;
+        SetAnimFloat("Speed",   _agent.velocity.magnitude);
+        SetAnimBool("IsAttacking",      _state == ZombieState.Attacking);
+        SetAnimBool("IsBreakingBarrier",_state == ZombieState.BreakingBarrier);
+        SetAnimBool("IsDead",           _state == ZombieState.Dead);
+    }
+
+    void SetAnimFloat(string name, float value)
+    {
+        if (animator.HasParameterByName(name)) animator.SetFloat(name, value);
+    }
+
+    void SetAnimBool(string name, bool value)
+    {
+        if (animator.HasParameterByName(name)) animator.SetBool(name, value);
+    }
+
+    void TriggerAnimatorTrigger(string name)
+    {
+        if (animator != null && animator.HasParameterByName(name))
+            animator.SetTrigger(name);
+    }
+
+#if UNITY_EDITOR
+    void OnDrawGizmosSelected()
+    {
+        Gizmos.color = Color.red;
+        Gizmos.DrawWireSphere(transform.position, attackRange);
+        Gizmos.color = Color.yellow;
+        Gizmos.DrawWireSphere(transform.position, barrierDetectRange);
+    }
+#endif
+}
+
+/// Extension to safely check Animator parameter existence
+public static class AnimatorExtensions
+{
+    public static bool HasParameterByName(this Animator animator, string name)
+    {
+        foreach (AnimatorControllerParameter p in animator.parameters)
+            if (p.name == name) return true;
+        return false;
+    }
+}
diff --git a/Assets/Scripts/AIBehaviour.cs.meta b/Assets/Scripts/AIBehaviour.cs.meta
new file mode 100644
index 0000000..6523321
--- /dev/null
+++ b/Assets/Scripts/AIBehaviour.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 1dace61880c5f3c4ebca0fd5711cc442
\ No newline at end of file
diff --git a/Assets/Scripts/Barrier.cs b/Assets/Scripts/Barrier.cs
new file mode 100644
index 0000000..c18c65a
--- /dev/null
+++ b/Assets/Scripts/Barrier.cs
@@ -0,0 +1,82 @@
+using UnityEngine;
+using UnityEngine.AI;
+
+/// <summary>
+/// Attach to any door/window barrier the zombie should break through.
+///
+/// Setup:
+///   - Add a NavMeshObstacle component (Carve = true) so the NavMesh treats it as blocked.
+///   - Assign the barrier's layer to match AIBehaviour.barrierLayer.
+///   - Optionally populate the 'boards' array with child visuals that get hidden as health drops.
+/// </summary>
+public class Barrier : MonoBehaviour
+{
+    [Header("Health")]
+    public float maxHealth = 100f;
+
+    [Header("Board Visuals (optional)")]
+    [Tooltip("Child objects representing planks/boards. They are hidden progressively as health drops.")]
+    public GameObject[] boards;
+
+    public bool IsDestroyed { get; private set; }
+
+    private float _health;
+    private NavMeshObstacle _obstacle;
+
+    void Awake()
+    {
+        _health   = maxHealth;
+        _obstacle = GetComponent<NavMeshObstacle>();
+    }
+
+    public void TakeDamage(float damage)
+    {
+        if (IsDestroyed) return;
+
+        _health -= damage;
+        UpdateBoards();
+
+        if (_health <= 0f)
+            Break();
+    }
+
+    void UpdateBoards()
+    {
+        if (boards == null || boards.Length == 0) return;
+
+        // Show boards proportional to remaining health
+        int boardsToShow = Mathf.CeilToInt((_health / maxHealth) * boards.Length);
+        for (int i = 0; i < boards.Length; i++)
+        {
+            if (boards[i] != null)
+                boards[i].SetActive(i < boardsToShow);
+        }
+    }
+
+    void Break()
+    {
+        IsDestroyed = true;
+
+        // Disable the NavMesh obstacle so pathfinding opens back up
+        if (_obstacle != null)
+            _obstacle.enabled = false;
+
+        // Disable colliders so zombies walk through
+        foreach (Collider col in GetComponentsInChildren<Collider>())
+            col.enabled = false;
+
+        // Hide visuals
+        foreach (GameObject board in boards)
+            if (board != null) board.SetActive(false);
+
+        Destroy(gameObject, 0.1f);
+    }
+
+#if UNITY_EDITOR
+    void OnDrawGizmosSelected()
+    {
+        Gizmos.color = new Color(1f, 0.5f, 0f, 0.5f);
+        Gizmos.DrawWireCube(transform.position, transform.localScale);
+    }
+#endif
+}
diff --git a/Assets/Scripts/Barrier.cs.meta b/Assets/Scripts/Barrier.cs.meta
new file mode 100644
index 0000000..c11db32
--- /dev/null
+++ b/Assets/Scripts/Barrier.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: db8fa53b3e3928e42878084d32a9d6b6
\ No newline at end of file
diff --git a/Assets/Scripts/PlayerHealth.cs b/Assets/Scripts/PlayerHealth.cs
new file mode 100644
index 0000000..284ad71
--- /dev/null
+++ b/Assets/Scripts/PlayerHealth.cs
@@ -0,0 +1,49 @@
+using UnityEngine;
+using UnityEngine.Events;
+
+/// <summary>
+/// Simple player health component. Attach to the Player GameObject.
+/// </summary>
+public class PlayerHealth : MonoBehaviour
+{
+    [Header("Health")]
+    public float maxHealth = 100f;
+
+    [Header("Events")]
+    public UnityEvent onDeath;
+    public UnityEvent<float> onHealthChanged; // passes current health
+
+    public float CurrentHealth { get; private set; }
+    public bool IsDead { get; private set; }
+
+    void Awake()
+    {
+        CurrentHealth = maxHealth;
+    }
+
+    public void TakeDamage(float damage)
+    {
+        if (IsDead) return;
+
+        CurrentHealth = Mathf.Max(0f, CurrentHealth - damage);
+        onHealthChanged?.Invoke(CurrentHealth);
+
+        if (CurrentHealth <= 0f)
+            Die();
+    }
+
+    public void Heal(float amount)
+    {
+        if (IsDead) return;
+
+        CurrentHealth = Mathf.Min(maxHealth, CurrentHealth + amount);
+        onHealthChanged?.Invoke(CurrentHealth);
+    }
+
+    void Die()
+    {
+        IsDead = true;
+        onDeath?.Invoke();
+        Debug.Log("[PlayerHealth] Player died.");
+    }
+}
diff --git a/Assets/Scripts/PlayerHealth.cs.meta b/Assets/Scripts/PlayerHealth.cs.meta
new file mode 100644
index 0000000..89c621d
--- /dev/null
+++ b/Assets/Scripts/PlayerHealth.cs.meta
@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 4004eaf09fe63cb48bd59da9575615ff
\ No newline at end of file
diff --git a/Assets/Settings/Mobile_RPAsset.asset b/Assets/Settings/Mobile_RPAsset.asset
index 7ceffe7..fedee07 100644
--- a/Assets/Settings/Mobile_RPAsset.asset
+++ b/Assets/Settings/Mobile_RPAsset.asset
@@ -12,8 +12,8 @@ MonoBehaviour:
   m_Script: {fileID: 11500000, guid: bf2edee5c58d82540a51f03df9d42094, type: 3}
   m_Name: Mobile_RPAsset
   m_EditorClassIdentifier: 
-  k_AssetVersion: 12
-  k_AssetPreviousVersion: 12
+  k_AssetVersion: 13
+  k_AssetPreviousVersion: 13
   m_RendererType: 1
   m_RendererData: {fileID: 0}
   m_RendererDataList:
@@ -53,6 +53,7 @@ MonoBehaviour:
   m_AdditionalLightsShadowResolutionTierHigh: 1024
   m_ReflectionProbeBlending: 1
   m_ReflectionProbeBoxProjection: 1
+  m_ReflectionProbeAtlas: 1
   m_ShadowDistance: 50
   m_ShadowCascadeCount: 1
   m_Cascade2Split: 0.25
@@ -78,11 +79,11 @@ MonoBehaviour:
   m_UseAdaptivePerformance: 1
   m_ColorGradingMode: 0
   m_ColorGradingLutSize: 32
+  m_AllowPostProcessAlphaOutput: 0
   m_UseFastSRGBLinearConversion: 1
   m_SupportDataDrivenLensFlare: 1
   m_SupportScreenSpaceLensFlare: 1
   m_GPUResidentDrawerMode: 0
-  m_UseLegacyLightmaps: 0
   m_SmallMeshScreenPercentage: 0
   m_GPUResidentDrawerEnableOcclusionCullingInCameras: 0
   m_ShadowType: 1
@@ -109,6 +110,7 @@ MonoBehaviour:
   m_PrefilterDebugKeywords: 1
   m_PrefilterWriteRenderingLayers: 1
   m_PrefilterHDROutput: 1
+  m_PrefilterAlphaOutput: 0
   m_PrefilterSSAODepthNormals: 1
   m_PrefilterSSAOSourceDepthLow: 1
   m_PrefilterSSAOSourceDepthMedium: 0
@@ -126,8 +128,14 @@ MonoBehaviour:
   m_PrefilterSoftShadowsQualityHigh: 1
   m_PrefilterSoftShadows: 0
   m_PrefilterScreenCoord: 1
+  m_PrefilterScreenSpaceIrradiance: 0
   m_PrefilterNativeRenderPass: 1
   m_PrefilterUseLegacyLightmaps: 0
+  m_PrefilterBicubicLightmapSampling: 0
+  m_PrefilterReflectionProbeRotation: 0
+  m_PrefilterReflectionProbeBlending: 0
+  m_PrefilterReflectionProbeBoxProjection: 0
+  m_PrefilterReflectionProbeAtlas: 0
   m_ShaderVariantLogLevel: 0
   m_ShadowCascades: 0
   m_Textures: