Skip to content

Back of the Box Builds

LEGO Alternate Builds!

SETS
- Adventurers
- Aquazone
- Belville
- BATMAN™
- BIONICLE
- Building Set with People
- Castle
- Duplo
- Fabuland
- Harry Potter
- Holiday and Event
- LEGOLAND
- Model Team
- Pirates
- Space
- Star Wars
- Technic
- Train
- Town
- Universal Building Set
- Western
- More Sets
- Misc
USEFUL LINKS
THIS IS AN INDEPENDENT SITE NOT AUTHORIZED OR SPONSORED BY THE LEGO GROUP

Alternate Builds Instructions Added Space Space Police I Space Police I Alternate Builds Very Small Alt Build Very Small Builds

6831 – Back A

May 3, 2020November 18, 2021 Master Builder 4367 Views

From: 6831: Message Decoder
Name: Message Runner ¹
Instructions: View PDF | Download .io File

Contributions

PDF and .io file submitted on November 17, 2021 by: Krysto

← 6831: Message Decoder
6831 – Back B →

You May Also Like

6805 – Back C

December 10, 2025December 10, 2025 Master Builder

6884 – Back C

September 24, 2019October 25, 2021 Master Builder

2154 – Inside A

June 14, 2023June 15, 2023 Master Builder

6516 – Back B

April 9, 2020April 9, 2020 Master Builder

1526 – Back B

April 4, 2020March 14, 2025 Master Builder

6643 – Back B

July 2, 2024July 2, 2024 Master Builder

EXPLORE MORE OFFICIAL SETS

Extra Large Builds Official Sets Studio Sets Studios

1382: Scary Laboratory

August 10, 2026August 10, 2026 Master Builder

Year Released: 2002BricklinkInstructions

Castle Castle Sets Dragon Knights Medium Builds Official Sets

6076: Dark Dragon’s Den

December 27, 2021December 27, 2021 Master Builder

Castle Castle Sets Forestmen Medium Builds Niels Milan Pedersen Official Sets

6054: Forestmen’s Hideout

April 10, 2021July 29, 2023 Master Builder

Extreme Team Official Sets Small Builds Town Town Sets

2963: Extreme Racer

January 30, 2024January 30, 2024 Master Builder

Black Knights Castle Castle Sets Official Sets Small Builds

6018: Battle Dragon

October 5, 2019April 4, 2020 Master Builder

Castle Castle Sets Official Sets Royal Knights Small Builds

6036: Skeleton Surprise

February 28, 2023February 28, 2023 Master Builder

Batman I BATMAN™ BATMAN™ Sets Large Builds Official Sets

7782: The Batwing: Joker’s Aerial Assault

March 27, 2026March 27, 2026 Master Builder

Episode III Large Builds Official Sets Star Wars Star Wars Sets

7257: Ultimate Lightsaber Duel

March 1, 2023March 1, 2023 Master Builder

Insectoids Insectoids Sets Large Builds Official Sets

6977: Arachnoid Star Base

November 9, 2019November 9, 2019 Master Builder

Dino Attack Official Sets Small Builds

7474: Urban Avenger vs. Raptor

April 27, 2023April 27, 2023 Master Builder

Extra Large Builds Official Sets Race Town Town Sets

6395: Victory Lap Raceway

July 1, 2022July 1, 2022 Master Builder

9V Medium Builds Official Sets Town Train Train Sets

4532: Manual Level Crossing

May 22, 2026May 22, 2026 Master Builder

Adventurers Adventurers Sets Desert Official Sets Small Builds

5928: Bi-Wing Baron

February 22, 2023February 22, 2023 Master Builder

Adventurers Adventurers Sets Desert Medium Builds Official Sets

5948: Desert Expedition

October 8, 2024October 8, 2024 Master Builder

ABCs Exo-Force Exo-Force Sets Medium Builds Official Sets

7700: Stealth Hunter

March 26, 2026March 26, 2026 Master Builder

9V Extra Large Builds Official Sets Town Train Train Sets

4561: Railway Express with Transformer and Speed Regulator

January 5, 2026January 5, 2026 Master Builder

BOXES

INSTRUCTIONS

FAVORITES

MINIFIGS

About This Site

There were once pictures of additional LEGO® builds on the back of set boxes. Written on the boxes was typically something about the endless building possibilities, "Build any of these exciting models with this set!" There were no instructions for these alternate builds, until now.

Sets

Adventurers
Aquazone
BATMAN
Bionicle
Belville
Building Set with People
Castle
Duplo
Fabuland
Harry Potter
Holiday and Event
LEGOLAND
Model Team
Pirates
Space
Star Wars
Technic
Train
Town
Universal Building Set
Western
More Sets
Misc

Useful Links

Submit Instructions!
New Instructions
New Official Sets
New Alternate Builds
Minifigs
Very Small Builds (<35 pcs)
Small Builds (<100 pcs)
Medium Builds (<200 pcs)
Large Builds (<400 pcs)
Extra Large Builds (>400 pcs)
How BOTBB was Built

In Honor of 1526

The classic space set that never was.

Copyright © 2026 Back of the Box Builds. All rights reserved. LEGO® is a trademark of the LEGO Group of companies which does not sponsor, authorize, or endorse this site.