Skip to content

Back of the Box Builds

LEGO Alternate Builds!

SETS
- Adventurers
- Aquazone
- Belville
- Building Set with People
- Castle
- Duplo
- Fabuland
- Harry Potter
- Holiday and Event
- LEGOLAND
- Model Team
- Pirates
- Space
- Star Wars
- Technic
- 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 3195 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

6484 – Back D

June 28, 2023June 30, 2023 Master Builder

4502 – Back A

May 15, 2023May 15, 2023 Master Builder

6856: Planetary Decoder

April 16, 2021March 22, 2025 Master Builder

6845 – Back C

January 14, 2025January 14, 2025 Master Builder

720 – Inside F

February 8, 2024February 9, 2024 Master Builder

6891 – Back C

September 13, 2019September 28, 2019 Master Builder

EXPLORE MORE OFFICIAL SETS

Episode IV/V/VI Large Builds Official Sets Star Wars Star Wars Sets

7166: Imperial Shuttle

April 16, 2021September 4, 2023 Master Builder

Year Released: 2001BricklinkInstructions

Aquaraiders I Aquazone Aquazone Sets Medium Builds Official Sets

2160: Crystal Scavenger

April 25, 2023April 25, 2023 Master Builder

Large Builds Official Sets Space Unitron Unitron Sets

1793: Space Station Zenon

April 19, 2021April 19, 2021 Master Builder

Episode IV/V/VI Medium Builds Official Sets Star Wars Star Wars Sets

7134: A-wing Fighter

December 29, 2021December 29, 2021 Master Builder

Basic Official Sets Small Builds Universal Building Set

510: Basic Building Set

July 11, 2024July 11, 2024 Master Builder

Blacktron Blacktron Sets Medium Builds Official Sets

6894: Invader

November 20, 2019November 20, 2019 Master Builder

Large Builds Official Sets Time Cruisers Time Cruisers Sets

6493: Flying Time Vessel

July 14, 2021December 29, 2021 Master Builder

Blacktron II Blacktron II Sets Official Sets Very Small Builds

6832: Super Nova II

October 5, 2019October 5, 2019 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

ABCs Official Sets Small Builds Space UFO UFO Sets

6829: Radon Rover

August 4, 2020March 22, 2025 Master Builder

Black Knights Castle Castle Sets Official Sets Small Builds

6018: Battle Dragon

October 5, 2019April 4, 2020 Master Builder

Castle Castle Sets Dragon Knights Large Builds Official Sets

6082: Fire Breathing Fortress

January 13, 2022January 13, 2022 Master Builder

Harry Potter Harry Potter Sets Medium Builds Official Sets Sorcerer's Stone

4705: Snape’s Class

April 16, 2021April 16, 2021 Master Builder

Classic Space Classic Space Sets Duplicate Set Number Official Sets Small Builds Space

6848: Interplanetary Shuttle

March 11, 2024March 11, 2024 Master Builder

Castle Castle Sets Official Sets Very Small Builds Wolfpack

1596: Ghostly Hideout

July 25, 2024July 25, 2024 Master Builder

Alpha Team Alpha Team Sets Mission Deep Sea Official Sets Very Small Builds

Kabaya: Alpha Team 1

September 9, 2024September 9, 2024 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
Belville
Building Set with People
Castle
Duplo
Fabuland
Harry Potter
Holiday and Event
LEGOLAND
Model Team
Pirates
Space
Star Wars
Technic
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.