Build and play games with your friends! Make a 3D platformer in 10 minutes, or spend hours jamming on the next indie hit. Game Builder is designed for all skill levels, from players ready to build their first game to designers looking for a faster way to realize their ideas.
Recent Reviews:
Very Positive (12) - 83% of the 12 user reviews in the last 30 days are positive.
All Reviews:
Very Positive (335) - 86% of the 335 user reviews for this game are positive.
Release Date:
Nov 1, 2018

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game is not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“Game Builder is an experimental prototype built to see if a game-tool hybrid is something that folks are interested in. If users are digging it (or what it could become), we’ll continue to grow the app and develop features based on feedback.”

Approximately how long will this game be in Early Access?

“Given this is a free early experimental prototype, it depends on users’ feedback - it could range from several months to a year.”

How is the full version planned to differ from the Early Access version?

“The scope of the full version is based on Early Access user feedback, but here are some of the things we have considered adding:
  • More cards, objects, and game templates
  • Sharing behaviors and pre-made objects on Steam Workshop
  • YouTube textures
  • Advanced audio controls
  • 2D UI creation tools
    What would you like to see in Game Builder?

What is the current state of the Early Access version?

“The current release includes the following features:
  • Spawn pre-made objects as well as 3D models from Google Poly
  • Create levels with terrain blocks
  • Edit the physics of objects
  • Bring actors to life with visual programming or JavaScript
  • Create lighting and particle effects
  • Share your creations on Steam Workshop
  • Play games instantly - no compiling required
    Everything is multiplayer, so you can build and play games with friends in real-time.

Will the game be priced differently during and after Early Access?

“Game Builder will remain free to the foreseeable future.”

How are you planning on involving the Community in your development process?

“We are active on the Steam discussion board as well as Discord. You can also use our built-in feedback forms. However you want to talk to us, we are here to listen and improve the product for you.”
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Play Game Builder


Recent updates View all (12)

July 26

July update: Share actors, custom terrain textures, and more!

You can now share actors on the workshop! Have an idea for a type of enemy or vehicle? Upload your creation to workshop so other builders can put it in their game.

Know JavaScript? Help others by creating new cards that they can use in their games!

Already, awesome builders have created cards for tile movement and custom UI.

We can’t wait to see what you all build for each other!

We’ve also enabled custom terrain textures. Have a cool ground texture you want to use? Just click the load button in the terrain sidebar

Here are the complete build notes for this update:
  • Share your actors!! See the import/export buttons in the "Custom" category of the Creation Library
  • Import your own terrain textures! Click the folder icon in the terrain texture/style picker
  • Road terrain blocks can now be rotated - you can finally create north-south roads!
  • Bug fix: More multiplayer physics improvements (actors not settling where they should be, etc.)
  • Bug fix: Particle emitters now rotate correctly with the actor
  • Bug fix: When you create a custom copy of an assigned card, properties are now copied over
  • Terrain tool: While creating terrain, hold the Control key to temporarily enter Delete mode
  • JavaScript QoL: Scroll positions are now remembered for each card you edit (just for the session)
  • Annoyed by default cards when you add a panel? Type "defaultCards" in the console to toggle this behavior
  • Added Change Camera card to allow dynamic switching of camera for cut-scenes, etc.
  • Cameras without camera cards no longer reparent (and thus no longer follow) the target actor, for flexibility.
  • More options in Board card: max distance and control over whether or not player must be facing vehicle.
  • Fixed missing icons in Change Variable and Variable Is cards.
  • Finally implemented getLocalPos(), getLocalRot(), setLocalPos(), setLocalRot().
  • IF-THEN panel can now be made to work offstage.
  • Added a Go Onstage card to allow an actor to return to the stage upon receiving an event, for instance.
  • Fixed scoreboard colors (were faded)
  • Health Panel changes: deck for actions to perform immediately when about to die, configurable delay, deck for after delay.
  • Player move cards now respect dead state and don't move player while dead, fixing the "player drifts while dead" bug.
  • Event causer for damage/death messages was incorrectly set to the player that was damaged rather than the object that damaged the player. This made it impossible to do deathmatch scoring. Fixed so the event causer is the actor causing the damage.
  • Added API to get/set sky and lighting: getSkyType(), setSkyType()m getSkyColor(), getSkyColor(), setSceneLighting(), getSceneLighting().
  • Added a uiGetScreenHeight() function to return the screen height in the game UI coordinate system, as it's not always 900.
  • Added a uiGetScreenInfo() function to get more info about the screen, including the actual size in pixels.
  • Added uiImageSlice for image slicing with noFilter option for crisp pixelated graphics.
  • Fixed missing parameter in requireNotEquals

We’ve also just been quietly releasing updates and posting the build notes on the forum. If you’re curious about those - here are links:Thanks again for checking out Game Builder!
1 comments Read more

June 21

Building Challenge: Cooking Game!

If you've been hungry for new 3D assets, check out our first artist pack - "Cooking" by Courtney Millman:

To celebrate, we are starting our first weekly challenge!


We challenge you to build a cooking-themed game and share it with the community! This challenge is on the table for one full week, so even if you can't start right away, there should be plenty of time to ketchup.

Given this our first challenge, we’re going to keep it pretty informal. More of a picnic than a fancy dinner, if you will. Just upload your creation to Steam Workshop and post it to this submission thread on the Steam message board. We can't wait to see what great games will turnip there!

The kitchen closes Thursday (June 27) at Midnight GMT, so submit your delicious game before then! We’ll play the games during the weekend and announce a winner Monday.

Ok, it's thyme to start! Bon appetit, and remember: do or donut, there is no try.

Challenge FAQ

Who’s judging and how?
We don’t know! Try the games out, rate them, and leave (constructive) comments. We’ll take your reviews and notes into account when choosing a winner.

What do I get if I win?
No prizes - just the pride of a job well done.

Where can I make suggestions about how to run these weekly challenges?
Post them to this suggestions thread on the forum - these challenges are for the community, so we want to know how you think they should work.

Where can I see more of Courtney’s art?
For more of Courtney’s work, follow her on Twitter or Artstation.

What's with all the food puns in this post?
They are cheesy, but hopefully you will lettuce get away with it. You never think about food puns? We do it on a dairy basis.
7 comments Read more
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Report bugs and leave feedback for this game on the discussion boards

About This Game

Game Builder is designed to empower any person to create 3D video games.

  • Create levels and environments with easy-to-use construction tools.
  • Multiplayer: Build and play games with your friends
  • No code required: Build games with our card-based visual programming system
  • Know how to code? Live-code your game using JavaScript
  • Easily find and use free 3D models from Poly

System Requirements

Mac OS X
    • OS: Windows 7 64 bit
    • Processor: Core 2 Duo
    • Memory: 4 GB RAM
    • Graphics: DX10 (SM 4.0) capable, 512MB VRAM
    • DirectX: Version 9.0
    • Network: Broadband Internet connection
    • Storage: 1 GB available space
    • OS: OS X v10.11 El Capitan or higher
    • Processor: 1.80GHz Processor
    • Memory: 4 GB RAM
    • Graphics: DX10 (SM 4.0) capable, 512MB VRAM
    • Network: Broadband Internet connection
    • Storage: 1 GB available space

What Curators Say

6 Curators have reviewed this product. Click here to see them.

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