You will get a full functional prototype from your game idea.


Let a pro handle the details

Buy Game Prototyping services from Guillaume, priced and ready to go.

You will get a full functional prototype from your game idea.


Select service tier

  • Delivery Time 7 days
  • Number of Revisions 1
    • Source Code
7 days delivery — Jul 2, 2024
Revisions may occur after this date.
Upwork Payment Protection
Fund the project upfront. Guillaume gets paid once you are satisfied with the work.

Let a pro handle the details

Buy Game Prototyping services from Guillaume, priced and ready to go.

Project details

This project offer a full implementation based on your game idea.
We will go through your game requirement together, establish a proper game design document from this and prototype the game.

My goal is to provide you with as much iteration on the gameplay so you can test and estimate your idea, refine it so you can decide wether or not you are ready and confident to go onto the next step building a full game.
Game Engine
Platform Type
PC, Mobile Device
Action, Adventure, Shooter, Role Playing, Educational, Platformers
What's included
Service Tiers Starter
Delivery Time 7 days 15 days 45 days
Number of Revisions
Source Code

Frequently asked questions

54 reviews
83% Complete
15% Complete
2% Complete
1% Complete
1% Complete
Rating breakdown


Spencer S.
Dec 17, 2023
HA: Empires & Interconnections - Unity Port to iOS and Android Guillaume is a game engineering virtuoso, and I'm thrilled to endorse his exceptional Unity 3D skills. Over several years, he's been instrumental in crafting numerous complex games using Unity 3D. Guillaume consistently delivers top-tier work, showcasing unparalleled expertise and dedication. His technical prowess, problem-solving finesse, and collaborative spirit make him a true rockstar in the field. Each project with him has not just met but exceeded our expectations. For anyone seeking a seasoned Unity 3D expert, Guillaume is the go-to professional. Our highest recommendation—working with him is a guarantee of excellence in every aspect of game development. A true Upwork gem. Highly recommend!!


Ohad B.
Jul 29, 2022
Developing a 3D Puzzle Game Guillaume is a star developer. Professional, super skilled, mature, excellent communicator. It was super enjoyable working with him and there was no task or feature he couldn’t handle. If I ever build a game studio with remote developers he will be the first I’ll try to hire.


Spencer S.
Oct 1, 2021
Expert Unity Game Programmer for Mobile Game About Contact Tracing Guillaume is a top-notch, professional game engineer and expert Unity developer that's a total joy to work with. Exceptional technical as well as project management skills. On top of every detail. Awesome follow-through. Understands all aspects of game production, from design, to art, to sound, extremely well. Big league talent. Consummate professional. Highly recommend!!


Kevin L.
Sep 2, 2021
2D Unity Dev


Robert R.
May 21, 2021
Mobile game Script editing Skillful programmer
Excellent in communication
Will be coming back
Guillaume L.

About Guillaume

Guillaume L.
Unity Game Development
100% Job Success
4.8  (54 reviews)
Naha, Japan - 11:31 am local time
Thanks for visiting my profile !

If you are looking for a full game development 2D or 3D, prototype implementation, additional features or optimizations, you came to the right place !

- Build a full 2D or 3D game from start to finish with Unity.
- Build a prototype to test your game idea.
- Build kit for your game idea so you can re-use and re-skin it
- Porting an existing game to different platforms.
- Update your old game project to last tech and engine version.
- Assisting you in publishing your game to store.
- Multiplayer integration using Mirror.


Can I build game with other engine ?
- My proficiency go over Unity, but I can also provide Construct 3 service ( usually for Html 5/WebGL game )

Do you only develop game ?
- Mostly , but I am always interested in new things,

What platform can you deliver for and test on ?
- I can provide , MacOS, Windows, WebGL, iOS and Android support.

Can you integrate 3rd party plugins ?
- Yes, including Ads, Metric tools ( Firebase )

Can you help with publishing ?
- yes I can guide you trough google and App store setup if you are not familiar with it.

Can you provide 100% original custom 2D or 3D artwork
- No, even I do have design experience, I am not dedicated 3d or 2d artist and this is not what I'am offering.
However I can help grab and put stock asset together including character animation, scene lighting and slight touch up on 3d models.

Is your rate negotiable ?
- Yes I am always open to discussion , so I can be flexible about it depending on your project time and requirements.


My name is Guillaume Letaeron, I am a self taught game developer with more than 10 years experience using Unity engine for mobile, desktop platforms.
During those years I have got the opportunity to work on various game genre as also less game app too.

I am also have background and experience in 3D modeling and audio production.

Thank you for your time reading.

Steps for completing your project

After purchasing the project, send requirements so Guillaume can start the project.

Delivery time starts when Guillaume receives requirements from you.

Guillaume works on your project following the steps below.

Revisions may occur after the delivery date.

Gather Requirements

From your idea, we will create a basic game document that will prepare for prototype.

Prototype first draft

Based on established document, a first playable prototype implementing core gameplay will be created.

Review the work, release payment, and leave feedback to Guillaume.