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 B

May 3, 2020November 18, 2021 Master Builder 4046 Views

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

Contributions

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

← 6831 – Back A
6831 – Back C →

You May Also Like

6765 – Back B

November 10, 2019November 10, 2019 Master Builder

2152 – Back A

January 14, 2021January 14, 2021 Master Builder

1596: Ghostly Hideout

July 25, 2024July 25, 2024 Master Builder

6739 – Back A

April 16, 2026April 16, 2026 Master Builder

6027 – Back A

January 28, 2022January 28, 2022 Master Builder

6668 – Back D

January 9, 2023January 10, 2023 Master Builder

EXPLORE MORE OFFICIAL SETS

Alternate Instructions Included BIONICLE BIONICLE Sets Instructions Added Medium Alt Build Medium Builds Official Sets Titans

8593: Makuta

April 23, 2026April 23, 2026 Master Builder

Year Released: 2003BricklinkInstructions 8593+8594+8595

Airport Classic Town Official Sets Small Builds Town Town Sets

6536: Aero Hawk

January 22, 2026January 22, 2026 Master Builder

Classic Space Classic Space Sets Large Builds Official Sets Space Super Model

1593: Super Model

February 3, 2021March 18, 2024 Master Builder

Large Builds Launch Command Official Sets Town Town Sets

6544: Shuttle Transcon 2

July 20, 2022July 20, 2022 Master Builder

9V Extra Large Builds Official Sets Town Train Train Sets

4554: Metro Station

August 10, 2026August 10, 2026 Master Builder

Bonus/Value Pack Sets Bonus/Value Packs Official Sets Small Builds

1597: Castle 3-Pack

July 22, 2024January 20, 2026 Master Builder

Classic Town Food and Drink Official Sets Small Builds Town Town Sets

6683: Burger Stand

May 1, 2024May 1, 2024 Master Builder

Bjarne Tveskov Official Sets Space Space Police I Space Police I Sets Very Small Builds

6831: Message Decoder

May 3, 2020July 29, 2023 Master Builder

Castle Castle Sets Dragon Knights Medium Builds Official Sets

6048: Majisto’s Magical Workshop

October 14, 2021October 14, 2021 Master Builder

Medium Builds Official Sets Outback Town Town Sets

6553: Crisis News Crew

December 4, 2023December 4, 2023 Master Builder

Castle Castle Sets Lion Knights Medium Builds Official Sets

6041: Armor Shop

September 25, 2024September 25, 2024 Master Builder

Classic Space Classic Space Sets Official Sets Small Builds Space

6874: Moon Rover

November 6, 2023November 6, 2023 Master Builder

Bonus/Value Pack Sets Castle Castle Sets Forestmen Official Sets Small Builds

1877: Crusader’s Cart

October 11, 2021September 24, 2024 Master Builder

Life on Mars Life on Mars Sets Official Sets Very Small Builds

7302 (1416, Kabaya: Life On Mars 2): Worker Robot

February 25, 2025February 25, 2025 Master Builder

Box Story Classic Town Fire Large Builds Official Sets Town Town Sets

6571: Flame Fighters

August 10, 2026August 10, 2026 Master Builder

Box Story Duplicate Set Number Medium Builds Ninja Ninja Alternate Builds Ninja Official Sets Official Sets

6083-2: Samurai Stronghold

December 16, 2025December 16, 2025 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.