Google Game Builder Alternatives for Making 3D Games

Game Builder is gone. It was a free experiment from Google's Area 120 incubator that let you build 3D, multiplayer games on a PC by snapping together logic cards, and it reached Steam in June 2019. Five months later, on November 7, 2019, the team announced it was ending development. The Steam version was removed a week later, and the final November 15 build dropped multiplayer, Google Poly, Google Image Search and Steam Workshop. Players had to save projects for offline use before then.

The code lives on. Google released it on GitHub under the Apache 2.0 licence and archived the repository on November 16, 2019. The README says the project is no longer maintained, and building it needs Unity 2018.4.12f1, since Unity 2019 does not work. For almost everyone, a live tool is the better choice. The picks below start with free 3D builders that, like Game Builder, give you multiplayer without writing a server, then move to engines that ask for more code but let you ship your own game.

Prices below are as of November 6, 2026. Our method is on How we review tools.

Quick comparison

Roblox Studio

Roblox Studio covers the part of Game Builder people loved most: build a 3D world, press play, and friends can join. Servers, accounts and matchmaking come with the platform. The setup guide calls it a free application for Windows and Mac. The minimum is Windows 10 or macOS 10.14 with 3 GB of RAM, and the guide recommends Windows 11 or macOS 14 with 8 GB.

Terrain tools, a parts library and a big asset Toolbox let you block out a level without code. Behaviour comes from scripts in Luau, Roblox's version of Lua, so expect to write some code sooner than you did with Game Builder's cards. The upside is an audience: your game is published straight to Roblox players on phones, consoles and PCs.

Best for: Game Builder fans who mainly want to make 3D multiplayer games to play with friends.

Pricing:

• Free to download and publish
• Creators can earn through Roblox's own economy, under Roblox's rules

Watch out for:

• Games live only inside Roblox. You cannot export a standalone build to sell on Steam or your own site.
• Logic needs Luau scripts. There is no card or block system like Game Builder's for full game rules.

Official site: Roblox Studio.

GDevelop

GDevelop is the nearest thing to Game Builder's "logic without code" idea in a tool you own. Rules are built in a visual event system of conditions and actions. The homepage calls it an open source 2D and 3D engine and includes a course for a 3D game where you run, drive and fight zombies. Multiplayer lobbies, leaderboards and player accounts are built in.

It is updated often. Version 5.6.287 was tagged on November 4, 2026. The editor runs on the web, Windows, macOS, Linux, iOS and Android, per the download page, and games export to desktop, web and mobile. An AI helper can answer questions and draft game mechanics.

Best for: Beginners who want no-code logic, 3D support and a game they can publish anywhere.

Pricing:

• Free: 3 cloud projects, 40 AI credits a month, 1 desktop and 1 Google Play publish a day, unlimited gd.games publishing
• Silver: $7.99/month or $54.99/year
• Gold: $13.99/month or $95.99/year
• Pro: $39.99/month or $399.99/year

Watch out for:

• The free plan shows a nag screen and cannot remove the watermark or publish to iOS.
• Its 3D tools are newer than its 2D ones. Most templates and community examples are still 2D.

Official site: GDevelop.

Unreal Editor for Fortnite

UEFN takes the Game Builder idea, make a game inside another game, and gives it Unreal Engine 5. The Epic Games Store listing says you get UE5 tools for lighting, VFX, animation and worldbuilding, plus Fortnite's own gameplay mechanics, multiplayer and backend. Islands publish to every platform Fortnite runs on, including PlayStation, Xbox and Nintendo Switch.

Money is the other difference. Epic says developers have earned over $722 million in engagement payouts, a share of Fortnite's revenue split among creators, and that selling items from islands is coming. Custom logic is written in Epic's Verse language, or assembled from prebuilt devices for simpler games.

Best for: Teens and hobbyists with a gaming PC who want their 3D game in front of Fortnite players.

Pricing:

• Free to download, build and publish, per UEFN Central, a third-party guide updated July 2, 2026
• Eligible islands earn engagement payouts from Fortnite revenue

Watch out for:

• The listing requires 64-bit Windows 10 or 11, 8 GB of RAM at minimum (16 GB recommended) and an NVMe SSD. There is no Mac editor.
• Everything you build stays inside Fortnite and under Epic's content rules.

Official site: Unreal Editor for Fortnite.

Construct 3

Construct 3 runs in a browser tab, so it works on a school Chromebook where Game Builder never did. You build logic in event sheets, rows of "when this happens, do that", which is the closest mainstream match to snapping cards onto an object. It is a 2D tool at heart.

The free edition is enough to learn on: 50 events, 2 layers, 2 effects and HTML5 export. Paid plans add Windows, Mac, Android and iOS export and allow commercial use, royalty-free.

Best for: Learners on a Chromebook or locked-down PC who want 2D games without code.

Pricing:

• Free edition: 50 events, 2 layers, 2 effects, web export, no commercial use
• Personal: $129.99/year or $18.99/month (US), as announced in July 2023
• Business: $469/year per seat, same announcement
• The buy page now shows a Startup plan and no amounts

Watch out for:

• It is a subscription with no one-time option, and a long forum thread complains about exactly that.
• The 50-event cap on the free edition is hit quickly once a game has menus and several levels.

Official site: Construct 3.

Scratch

Scratch is MIT's free block-based programming language and online community, per its FAQ. Kids drag coloured blocks to make sprites move, react and keep score, the same cause-and-effect thinking Game Builder's cards taught. Every shared project can be opened and remixed, which is how most young users learn.

It runs in a browser, and an offline app exists for Windows, Mac, ChromeOS and Android. For other free tools at this level, see our Wick Editor alternatives.

Best for: Children and classrooms starting from zero.

Pricing:

• Free, with no paid tier

Watch out for:

• It is 2D only, with no 3D worlds like Game Builder had.
• Projects run inside Scratch. Turning one into a standalone app needs third-party packagers.

Official site: Scratch.

Godot

Godot is a full game engine with no fee at any size. It is MIT licensed, per the licence page, so you keep everything you make with no royalties or splash screen. Version 4.7.2, dated August 18, 2026, is the current stable release on the download page.

It handles 2D and 3D and uses GDScript, a Python-like language that beginners pick up fast. There is no visual card system, so plan on following a tutorial for your first project. People building classic RPGs in it can compare it with no-code tools on our RPG Maker alternatives page.

Best for: Teens and adults ready to learn real game code without paying anything.

Pricing:

• Free and open source (MIT), with no royalties

Watch out for:

• Consoles need a third-party porting company, because console SDKs are under NDA, per the Godot docs.
• Multiplayer is possible but you build and host it yourself, unlike Roblox or Fortnite.

Official site: Godot. Our listing: Godot.

Unity

Game Builder was itself a Unity project, which tells you what Unity can do. It is the industry engine for indie 3D games and mobile titles, and it has a visual scripting graph for people who do not want to start with C#. The asset store sells or gives away ready-made characters, terrain and full game templates.

Unity Personal is free until revenue or funding passes $200,000 a year, and with Unity 6 the splash screen is optional, per the pricing update page. The planned Runtime Fee was cancelled. Pro costs $2,310 per seat per year.

Best for: Learners who want the engine most indie studios hire for.

Pricing:

• Personal: free up to $200,000 in revenue and funding
• Pro: $2,310 per seat per year, or $210 per month

Watch out for:

• Unity raised prices by 5% on January 12, 2026, per the same page. Pricing has changed often, so read the terms before you commit a long project.
• It is a big, general engine. A first 3D game takes far longer than in Roblox Studio or GDevelop.

Official site: Unity. Our listing: Unity.

How to choose

Can you still run Game Builder

Only as an unsupported build. The archived repository has the full Apache 2.0 source and a reference build, but no releases, and the online features were removed in the last update. If you saved a project offline before November 15, 2019, you can open it in that build to look at it. For anything new, pick a tool above.

Frequently asked questions