GrowBlocks / Guides
Guides
GrowBlocks is a multiplayer browser game platform and game engine. Players play free 3D games in the browser on PC and phone with their own character. Developers code games in JavaScript with the GrowBlocks Dev Kit (three.js, Rapier physics, characters, multiplayer rooms, free hosting), usually together with an AI assistant such as Claude Code or Cursor.
- GrowBlocks vs Unity 6 WebGL: the same game built in both enginesWe rebuilt BLOCKBLADE, a 3D sword adventure, in Unity 6 WebGL with the same models and rules, and measured both in the same browser: download size, time from a change to playable, AI workflow, and what comes with the engine..
- How to build a multiplayer 3D browser game with Claude CodeStep by step: use Claude Code (or Cursor) with the GrowBlocks Dev Kit to build a multiplayer 3D game that runs in the browser on PC and phone, then publish it with no servers to set up..
- A three.js game framework with characters, physics and multiplayer built inthree.js is a renderer, not a game engine.
- A Roblox and Fortnite UEFN alternative for game creatorsHow GrowBlocks compares with Roblox and Fortnite UEFN for creators: browser play with no install, JavaScript instead of Luau or Verse, a shared character and market, and a 70% share of the fees your game generates..
- A Unity alternative for small web gamesFor small 3D games that should load fast in a browser and work on phones, a web-native engine is often a better fit than a Unity WebGL build.
- Browser game engines compared: GrowBlocks, three.js, Babylon.js, PlayCanvas, GDevelop and RosebudA plain comparison of engines for 3D games in the browser in 2026: three.js, Babylon.js, PlayCanvas, GDevelop, Rosebud AI and the GrowBlocks Dev Kit, by what each one gives you and who it suits..