Build Your First C# Game: Unity, Godot, Stride or MonoGame

Your first C# game should prove a small loop: read input, move a player, collect a target, update a score, and restart. A single screen is enough. Choose your engine after deciding where the game must run and how much of the workflow you want to control in code.

If you are still learning variables, conditions and methods, begin with the C# learning path. The video learning guide can support that practice. Use the package and engine directory when you need a specific dependency.

Choose the workflow and target together

These are workflow comparisons, not speed or quality rankings. Engine capabilities below were reviewed in official documentation on 4 October 2026. No editor, rendered game, or platform export was run for this guide.

Define a game you can finish

Make a collection game with one player, one target, and one score counter. Use an untextured shape first. Keep all play on one screen. When the player touches the target, increment the score and move the target. Add a restart control that resets both score and position.

1. Pick the first deployment target, such as a Windows or Linux desktop build. Export an empty project before adding game logic.
2. Record the editor/framework version, SDK, graphics backend, and target. Keep the first working project in version control.
3. Implement left and right movement with a fixed speed in units per second. Clamp the position to the visible play area.
4. Add target collection and a score update. Confirm one overlap produces one collection event, rather than one event per frame.
5. Add restart and a clear end condition, such as collecting five targets. Build and launch the exported game outside the editor.

That sequence is an editorial project plan. It keeps installation, game rules and deployment problems separate enough to investigate each one.

Start in Unity

Create a project for your chosen editor version, save a scene, and add a visible object. Create a C# component and attach it to the object. Keep the first behavior limited to movement before adding UI or imported assets. Follow the versioned script creation and scene guidance.

Our documentation baseline is Unity 6.0, identified as 6000.0. That is an editor/manual version, not a .NET runtime version. Mono uses JIT compilation; IL2CPP converts IL to C++ and produces native code. The available choice depends on your player target. Check the scripting backend and system requirements before the first export.

Review Unity’s editor terms for the organization and use case. A package that works in a desktop .NET console project does not automatically work with Unity’s APIs or IL2CPP.

Start in Godot with C#

Install the .NET-enabled editor and the SDK required by your chosen Godot release. Create a 2D project, make a player scene, attach a C# script, and run it. Follow the official first 2D game, which provides C# examples alongside GDScript examples. Use the C# examples deliberately; the two languages have different API conventions.

The archive lists 4.7.2-stable as an observed release. The stable C# platform page says desktop exports are supported, Android and iOS remain experimental, and C# projects cannot export to Web. iOS export requires macOS; the official iOS simulator templates support x64 only.

Match editor and export templates. Verify exact-release SDK requirements rather than copying a requirement from another version: the retrieved C# basics page gives a prerequisite specifically for Godot 4.5. A working editor scene is not proof that a mobile export works.

Start in Stride

Use the official getting-started guide to create a beginner project and open Game Studio. Add or modify one C# script on a visible entity, then run the scene. The C# beginner series provides a learning route through scripts and engine concepts.

The observed Stride 4.3 release notes describe .NET 10 and C# 14 integration. Distinguish packaged-engine requirements from instructions for building the engine itself from a moving source branch.

Check export support against your pinned release. The retrieved platform list contains older operating-system minima. We do not treat that list as a verified modern deployment matrix. Export a minimal project to the intended target before selecting Stride for a platform commitment.

Start in MonoGame

Follow the OS and IDE setup guide, choose a desktop project template, and run the empty game. Keep game-state changes in the update phase and rendering in the draw phase. Start with simple shapes or one licensed sprite before building a larger content pipeline.

MonoGame is a framework, so your code owns more of the scene and gameplay structure. Desktop, mobile and console targets have different setup requirements; console access requires platform-holder developer approval. Check the supported-platform guide for your target.

The retrieved Ubuntu guide specifies a .NET 9 setup and Wine for effect compilation. Our .NET 10 package checks did not execute MonoGame or its graphics pipeline.

Test a movement rule before connecting engine input

Game rules that use plain C# can be checked independently of a rendered scene. This helper moves one coordinate by direction × speed × elapsed seconds, then clamps the result. It does not read engine input, run collision detection, or implement physics.

public static class GameRules
{
    public static float Move(float position, float direction, float speed,
                             float seconds, float minimum, float maximum)
    {
        if (seconds < 0 || speed < 0 || minimum > maximum)
            throw new System.ArgumentOutOfRangeException();
        float next = position + direction * speed * seconds;
        return System.Math.Max(minimum, System.Math.Min(maximum, next));
    }
}

In the checked example, a speed of 4 units per second for half a second moves position 0 to 2 with direction 1, and to −2 with direction −1. Starting at 4 with a maximum of 5 stops at 5. These three results passed in a .NET 10 console fixture on Linux.

When adapting the helper, normalize direction for your input scheme and pass elapsed time from the appropriate engine callback. If the engine’s physics system owns the body, use that system’s movement API and timing rather than assigning the transform independently. Unit tests for the helper cannot validate that integration.

Check the finished project

• Movement uses elapsed time and stays within bounds at different frame rates.
• Target overlap increments the score once and restart resets the same state shown on screen.
• The first exported build starts on the actual target machine, accepts input, and finds its assets.
• Project, framework, packages, and assets have recorded versions and distribution permissions.

Once that small game works, add one feature at a time: a timer, sound, another target, or a menu. Keep the first working export as the baseline you can return to.