Build anything
Place, stack and paint colorful 3D blocks — cubes, bricks, slopes, spheres, arches and more. Your build plate, your rules.
Universal Labs Games
BLOX — the 3D block building game you play in your browser
BLOX
Build◆Connect◆Customize
Free to play
Best played on desktop
See it in action
Watch builds come to life, block by block
Castles, towers and whole worlds — all built in BLOX, right in a browser tab.
⚡ Instant — no download
💾 Saves to your free account
🖥️ Chrome · Edge · Firefox · Safari
What is BLOX
A whole universe of blocks, in your browser
BLOX is a 3D block building game from Universal Labs. Open a tab, click Play and build whatever you can imagine — alone, or with the community.
Real textures
Paint with grass, brick, metal, sand, snow, water and more. Swap terrain skins to set the scene for your world.
Daily & weekly challenges
Fresh building challenges every day and week. Beat them to earn XP and Bits, level up and climb the ranks.
Share with the community
Publish your best builds to the community feed. Get likes and comments — and find inspiration for your next project.
Zero install
Runs in any modern browser, Chromebooks included. No launcher, no updates to download — always the latest version.
Free, for real
No paywall and no ads. Everything is unlocked by playing — earn Bits as you build and spend them on new looks.
Bits
Earn Bits just by playing
Bits are the BLOX currency. They drip in while you play — and challenges pay out big.
Just play
Bits drip into your wallet automatically while you build. The longer you play, the more you earn.
passive drip
Beat challenges
Main, daily and weekly challenges test your building skills. Harder challenges pay far more Bits.
biggest payouts
Spend on skins
Trade your Bits in the shop for block skins and terrain skins — fresh looks for your world.
shop & pickers
Customize
Collect skins for every block
Grass, brick, metal, sand, snow, water — paint your builds with real textures and unlock more as you play.
Community
See what builders are making
The community feed is where the best builds land. Like them, comment on them, and post your own.
FAQ
BLOX questions
Is BLOX free?
Yes. BLOX is 100% free to play in your browser — no download, no install, no ads.
Do I need to download anything?
No. BLOX runs instantly in Chrome, Edge, Firefox and Safari. Just open bloxbuilder.io and click Play.
What can I build in BLOX?
Anything you imagine: houses, castles, pixel art, vehicles, towers and whole worlds out of 3D blocks — cubes, bricks, slopes, spheres and arches — painted with real textures like grass, brick, metal, sand, snow and water.
Is BLOX like Minecraft or LEGO?
BLOX is a block building game in the spirit of LEGO and creative-mode sandbox games, but it runs right in your browser with no install. It is not affiliated with Roblox, Minecraft or LEGO.
Can I play BLOX on mobile or Chromebook?
BLOX runs on any modern browser, including Chromebooks. It is best played on desktop with a mouse and keyboard.
How do I earn Bits and skins?
Bits drip in while you build and big payouts come from main, daily and weekly building challenges. Spend Bits in the shop on block skins and terrain skins.
Can I share my builds?
Yes. Publish builds to the BLOX community feed to get likes and comments, and browse other players' creations for inspiration.
Do I need an account to play?
No. You can jump in as a guest. A free account saves your progress, Bits, skins and levels, and lets you post to the community.
More answers in the Help center.
Ready to build?
Free to play, right in your browser. Your first block is one click away.
▶ Play BLOX now