Skip to content Skip to sidebar Skip to footer

Widget HTML #1

Learn Stealth Game Development | Unity 3D Hitman Game Clone

Learn Stealth Game Development | Unity 3D Hitman Game Clone

In this course you will learn and build stealth game like hitman using unity game engine. Unity is a cross-platform game engine developed

Enroll Now

Creating a stealth game similar to the Hitman series in Unity 3D can be both an exciting and challenging project. The Hitman games are known for their deep mechanics, engaging AI, and intricate level design, which combine to offer a compelling stealth experience. This guide will provide an overview of the essential elements you need to consider and develop to create a basic stealth game clone in Unity 3D.

Getting Started with Unity 3D

First, make sure you have Unity installed. You can download it from the Unity website and follow the installation instructions. Once installed, create a new project. Choose the 3D template, as this will be the foundation of our game.

Project Structure and Organization

Organizing your project is crucial for efficient development. Here’s a suggested structure:

  • Assets/: All game assets.
    • Scripts/: All your C# scripts.
    • Prefabs/: Prefabricated game objects.
    • Models/: 3D models.
    • Animations/: Animation files.
    • Scenes/: Different game levels or scenes.
    • Textures/: Textures and materials.

Player Character

3D Model and Animations

Start with the player character. You can either create your own 3D model or find a free model online. Import the model into Unity and set up the animations for walking, running, sneaking, and any other necessary actions. Unity’s Animator component will be used to control these animations.

Movement Script

Create a new C# script named PlayerMovement. This script will handle the player's movement, including walking, running, and sneaking.

using UnityEngine; public class PlayerMovement : MonoBehaviour { public float walkSpeed = 2f; public float runSpeed = 6f; public float sneakSpeed = 1f; private Rigidbody rb; void Start() { rb = GetComponent<Rigidbody>(); } void Update() { float moveHorizontal = Input.GetAxis("Horizontal"); float moveVertical = Input.GetAxis("Vertical"); Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical); if (Input.GetKey(KeyCode.LeftShift)) { rb.velocity = movement * runSpeed; } else if (Input.GetKey(KeyCode.LeftControl)) { rb.velocity = movement * sneakSpeed; } else { rb.velocity = movement * walkSpeed; } } }

This script uses Rigidbody for physics-based movement. It adjusts the speed based on player input, allowing for walking, running, and sneaking.

Enemy AI

Enemy AI is a critical component of a stealth game. The AI should be able to patrol, detect the player, chase, and attack.


Create a new C# script named EnemyPatrol. This script will handle the patrolling behavior.

using UnityEngine; public class EnemyPatrol : MonoBehaviour { public Transform[] waypoints; public float speed = 2f; private int currentWaypointIndex = 0; void Update() { if (waypoints.Length == 0) return; Transform targetWaypoint = waypoints[currentWaypointIndex]; Vector3 direction = targetWaypoint.position - transform.position; transform.Translate(direction.normalized * speed * Time.deltaTime, Space.World); if (Vector3.Distance(transform.position, targetWaypoint.position) < 0.3f) { currentWaypointIndex = (currentWaypointIndex + 1) % waypoints.Length; } } }

This script makes the enemy move between predefined waypoints.

Detection and Chasing

Create another script named EnemyDetection.

using UnityEngine; public class EnemyDetection : MonoBehaviour { public float viewDistance = 10f; public float viewAngle = 45f; public LayerMask playerMask; public LayerMask obstacleMask; private Transform player; void Start() { player = GameObject.FindGameObjectWithTag("Player").transform; } void Update() { Vector3 directionToPlayer = (player.position - transform.position).normalized; float distanceToPlayer = Vector3.Distance(transform.position, player.position); if (Vector3.Angle(transform.forward, directionToPlayer) < viewAngle / 2 && distanceToPlayer < viewDistance) { if (!Physics.Linecast(transform.position, player.position, obstacleMask)) { // Player detected, chase player ChasePlayer(); } } } void ChasePlayer() { // Implement chasing logic here transform.position = Vector3.MoveTowards(transform.position, player.position, 2f * Time.deltaTime); } }

This script allows the enemy to detect the player within a certain field of view and distance. If the player is detected, the enemy will chase the player.

Stealth Mechanics

Hiding Spots

Create hiding spots where the player can hide. These can be simple objects like lockers or bushes. Use colliders to detect when the player enters a hiding spot.

using UnityEngine; public class HidingSpot : MonoBehaviour { void OnTriggerEnter(Collider other) { if (other.CompareTag("Player")) { // Player enters hiding spot other.GetComponent<PlayerMovement>().enabled = false; // Implement hiding logic } } void OnTriggerExit(Collider other) { if (other.CompareTag("Player")) { // Player leaves hiding spot other.GetComponent<PlayerMovement>().enabled = true; } } }

This script disables player movement when hiding and re-enables it when leaving the hiding spot.

Level Design

Design levels that support stealth gameplay. Include multiple paths, hiding spots, and vantage points. Use lighting and shadows strategically to create areas where the player can remain unseen.


Lighting plays a significant role in stealth games. Use dark areas where the player can hide and well-lit areas where they are more visible. Dynamic lights can add to the atmosphere and complexity of the gameplay.

Sound Design

Sound is crucial in stealth games. Footsteps, enemy alerts, and ambient sounds enhance immersion and gameplay. Use Unity’s AudioSource and AudioListener components to manage sounds.

Footstep Sounds

Add footstep sounds to the player character.

using UnityEngine; public class FootstepSounds : MonoBehaviour { public AudioClip[] footstepClips; private AudioSource audioSource; void Start() { audioSource = GetComponent<AudioSource>(); } void Update() { if (Input.GetAxis("Vertical") != 0 || Input.GetAxis("Horizontal") != 0) { if (!audioSource.isPlaying) { PlayFootstep(); } } } void PlayFootstep() { AudioClip clip = footstepClips[Random.Range(0, footstepClips.Length)]; audioSource.PlayOneShot(clip); } }

This script plays random footstep sounds when the player moves.

User Interface

Create a simple UI to show health, objectives, and other game information. Unity’s UI system can be used to create health bars, mission objectives, and inventory systems.

Polishing and Testing

After implementing the basic mechanics, spend time polishing your game. Playtest frequently to identify issues and gather feedback. Refine the AI, tweak the level design, and enhance the visuals and sounds based on feedback.


Developing a stealth game like Hitman in Unity 3D involves understanding and implementing various mechanics, from player movement and enemy AI to level design and sound. By following this guide and continuously iterating on your design, you can create a compelling and engaging stealth game. Unity’s extensive documentation and community resources are invaluable tools as you embark on this game development journey. Happy coding!