Type a set number. Build it from the official instructions.
The real LEGO® booklets from LEGO.com, one page at a time — solo or with up to 10 builders in sync.
Try:
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My Collection
Your shelf is empty. Search a set above to start building — or add one to your wishlist.
No set loaded. Go Home and enter a set number.
Start a room
Build with up to 10 people. Share the code; they join from any device.
Join a room
Enter the 6-letter code from the host.
Same-device mode needs no code — just create a room and add names.
Profile
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Build
Instructions come from LEGO.com. Booklets you open are kept on this device so they load instantly next time.
Data sources
No key — the "Find pieces" helper won't show a piece list. Instructions work without it.
Only needed when the site is hosted on another domain — see README for the 2-minute Cloudflare Worker.
⚠ Keys stay in this browser only. Never commit keys to a public repo.