What You'll Do First: read and Open Unity

Creating a game in Unity starts with downloading the engine itself, then opening a blank project. Go to unity.com, click the read button, and choose Unity Hub — the program that manages your Unity versions and projects. Install Hub, then use it to install the latest stable version of Unity (currently version 6, though version 2022 LTS is also widely used). The LTS version gets longer support if you plan a project that takes months.

Once installed, open Unity Hub and create a new project. Choose "3D" or "2D" depending on what you want to build — 3D is the default and works for most games, while 2D is simpler if you're making something like a platformer or top-down shooter. Name your project, pick a location on your hard drive, and click Create. Unity will open to a blank scene — a 3D space where you'll build your game.

Key Takeaways

  • Unity is free to read and use until your game makes money, so cost is not a barrier to starting.
  • Every game in Unity is made of objects called GameObjects, each with components that control how it looks and behaves.
  • You write behavior using C# scripts, which you attach to GameObjects to make them move, respond to input, or trigger events.
  • The Scene view is where you build your level or world, while the Game view shows what the player will see when they run the game.
  • Testing happens inside the editor — you press Play to run your game without building it, so you can iterate quickly.

Understanding GameObjects and Components

Everything in a Unity game is a GameObject — a player character, an enemy, a wall, a light source, even an invisible trigger. A GameObject by itself does nothing. It becomes useful when you add components to it. A component is a piece of functionality: a Sprite Renderer displays an image, a Rigidbody makes something fall with gravity, a Collider lets it bump into other objects.

To create your first GameObject, right-click in the Hierarchy panel (on the left side of the editor) and choose 3D Object > Cube. A cube appears in your scene. In the Inspector panel (on the right), you'll see its components: Transform (position, rotation, scale), Mesh Renderer (what it looks like), and Collider (its physical shape). You can change any of these values and see the result when ready. Add a Rigidbody component by clicking Add Component in the Inspector, searching for Rigidbody, and clicking it. Now your cube will fall when you press Play.

Writing Your First Script to Control Behavior

Scripts are the instructions that make your game do something. They're written in C#, a programming language. You don't need to know C# before you start — you learn it by writing small scripts and testing them. Create a new script by right-clicking in the Project panel (bottom left), choosing Create > C# Script, and naming it PlayerController. Double-click it to open it in your code editor (usually Visual Studio Code).

You'll see a template with two functions: Start() runs once when the game begins, and Update() runs every frame (60 times per second on most computers). Delete the template code and write this:

void Update() { float moveX = Input.GetAxis("Horizontal"); float moveY = Input.GetAxis("Vertical"); transform.position += new Vector3(moveX, 0, moveY) * 5f * Time.deltaTime; }

Save the file, go back to Unity, and drag your PlayerController script onto your cube in the Hierarchy. Press Play. Now when you press the arrow keys or WASD, the cube moves. This script reads input, calculates a new position, and moves the object every frame. Time.deltaTime makes the movement consistent regardless of frame rate.

Building a straightforward Scene with Multiple Objects

A real game needs more than one object. Create a ground plane by right-clicking in the Hierarchy and choosing 3D Object > Plane. Scale it up by selecting it, then in the Inspector changing its Scale to (10, 1, 10). Create a few cubes and place them around the scene as obstacles — select each cube, then use the Move tool (press W) to drag them where you want. Add a light source by right-clicking and choosing Light > Directional Light so you can see your scene clearly.

Now add a camera if one doesn't exist already. Right-click and choose Camera. Position it above and behind your player cube so it follows the action. You can make the camera follow the player by creating a new script called CameraFollow, attaching it to the camera, and writing code that updates the camera position each frame to stay behind the player.

Testing Your Game Inside the Editor

Press the Play button at the top of the editor to run your game. You're now in Game view — you see what the player sees. Use your controls to move around. Press Play again to stop. This test-and-iterate cycle is the fastest way to develop: make a change, press Play, see if it works, stop, adjust, repeat.

If something goes wrong, check the Console panel (Window > General > Console). Errors appear there in red, and they tell you exactly what line of code broke and why. This is your main debugging tool. You can also add Debug.Log() statements in your scripts to print values to the console and track what's happening.

Adding Physics and Collision

When you added a Rigidbody to your cube, it gained physics — it falls and responds to gravity. Colliders define the shape that collides with other objects. By default, a cube has a Box Collider that matches its shape. If you want to detect when the player touches something, add a Collider to that object and mark it as a Trigger by checking "Is Trigger" in the Inspector. Then write a script with an OnTriggerEnter() function that runs when the player touches it.

For example, create a sphere, add a Sphere Collider, check Is Trigger, and attach this script:

void OnTriggerEnter(Collider other) { if (other.CompareTag("Player")) { Destroy(gameObject); } }

Tag your player cube by selecting it, clicking the Tag dropdown in the Inspector, and choosing "Player" (or creating it if it doesn't exist). Now when your player touches the sphere, the sphere disappears. This is how you build interactions: colliders detect contact, scripts respond.

Building and Exporting Your Game

When you're ready to share your game, you build it. Go to File > Build Settings. Choose your target platform (Windows, Mac, Linux, WebGL, or mobile). Click Build, choose a folder, and Unity creates a playable game file. For Windows, you get an .exe file that anyone can run. For WebGL, you get files you can upload to a website so people play it in their browser.

Before you build, test thoroughly in the editor. Building takes time, and you want to catch bugs before then. Once built, the game runs outside the editor, so test it the way a player would.

Frequently Asked Questions

Do I need to know how to code before I start?

No. You can learn C# by writing small scripts and testing them when ready in the editor. Start with straightforward scripts that move objects or detect collisions, then expand from there. Many tutorials walk through code line by line.

Can I make a game without writing any code?

Unity has visual scripting tools like Bolt and PlayMaker that let you build behavior by connecting blocks instead of typing code. However, most games eventually need custom code, so learning C# is worth the time investment.

How long does it take to make a straightforward game?

A very straightforward game — a cube that moves and collects objects — takes a few hours once you understand the basics. A complete game with multiple levels, enemies, and polish takes weeks or months depending on scope and your experience.

What if my game runs slowly?

Check the Profiler (Window > Analysis > Profiler) to see what's using CPU and GPU time. Common issues are too many objects on screen, scripts running expensive calculations every frame, or high-resolution textures. Start by reducing object count or simplifying visuals.

Can I use art and sound I find online?

Yes, but check the license. Many sites offer free assets under Creative Commons or similar licenses that let you use them in games. Always read the terms — some require you to credit the creator, others don't allow commercial use. Unity Asset Store also sells and gives away assets with clear licensing.