JustBuild.World

A FREE BROWSER BUILDING GAME

Build a world.
Block by block.

Choose a landscape and build with blocks, stairs and half-blocks. Fly around your work, undo mistakes and save your world in this browser.

Play JustBuild Explore the game

Free to play. No download. No account.

An illustrated voxel island with grassy terraces, a blue river, trees and a stone arch.
A world made of blocks.ILLUSTRATION · NOT A GAME SCREENSHOT
Play in your browser.SCROLL TO EXPLORE

SANDBOX MODE

Explore. Build. Save.

Choose your materials from the block picker and build at your own pace. Sandbox Mode is single-player, with flight and undo available from the start.

01PROCEDURAL WORLDS

Explore generated terrain

Start with a seed. Explore forests, deserts, oceans and caves in a world that generates as you go.

02CREATIVE BUILDING

Build with blocks and shapes

Choose blocks, stairs and half-blocks from the picker. Place, remove and undo edits, then fly around to inspect your build.

03LOCAL AUTOSAVE

Save and share your builds

Return to your saved world in this browser. Copy a world code to back it up, share your edits or move it to another device.

BUILT IN JUSTBUILD

Choose something to build

Start with a small project. Each guide has dimensions, game screenshots and a world code for the finished example.

An oak-plank bridge with raised edges spanning a water channel in JustBuild.

A wooden bridge

Span a nine-block gap with a three-block-wide deck, supports and raised edges.

Used to building in Minecraft or Roblox? JustBuild is a separate, single-player game: choose blocks from the picker, press F to fly and use Ctrl+Z to undo an edit. A shared world code opens a separate copy; it does not connect players or import worlds from other games.

All building guides

GETTING STARTED

Your first build

Start your world
  1. 01

    Choose a world

    Pick one of nine starting worlds: six landscapes, or ground you choose yourself. Leave the seed blank for a random landscape, or enter a seed to get the same one twice.

  2. 02

    Find a place to build

    Move with WASD and look with the mouse. Press F to fly and Space to climb. Touch devices have on-screen controls.

  3. 03

    Choose blocks and place them

    Press E to open the block picker. Right-click to place, left-click to remove and Ctrl+Z to undo. Press Escape to save or change settings.

GOOD TO KNOW

Before you play

What is JustBuild.World?

JustBuild.World is a free, single-player voxel sandbox game you play in your browser. Its worlds are made of blocks you can place and remove. Sandbox Mode focuses on exploring and creative building.

Do I need to download anything or create an account?

No. Open the game, choose a world and start playing. There is no installation or sign-up. You need a modern browser with WebGL support.

Does JustBuild.World save my builds?

Yes. Changes autosave locally in the browser you use to play. Keep using the same browser and device to return to your world. Clearing browser site data removes local saves.

Can I play with friends?

JustBuild.World is single-player. In the pause menu, use Copy world code to share the world you are in, including your edits. The recipient can use Load world code to open their own copy. A seed shares only the starting terrain; you cannot build together live.

How do I move and build?

On a computer, use WASD to move, the mouse to look, Space to jump and F to toggle flight. Left-click removes a block; right-click places one. Press E to choose blocks and Escape to pause. Touch controls are also available on touch devices.

READY TO BUILD?

Create your world

Choose a preset and start placing blocks.

Play JustBuild Free to play · No download · No account