Skip to content
Back of the Box Builds

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
    • Submit Instructions!
    • New Instructions
    • New Official Sets
    • New Alternate Builds
    • Minifigs
    • Very Small Builds
    • Small Builds
    • Medium Builds
    • Large Builds
    • Extra Large Builds
    • How BOTBB was Built
  • 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 4621 Views

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

Contributions

  1. PDF and .io file submitted on November 17, 2021 by: Krysto
  • ← 6831: Message Decoder
  • 6831 – Back B →

You May Also Like

6277 – Back C

January 6, 2022January 6, 2022 Master Builder

6016: Knight’s Arsenal

October 12, 2021October 12, 2021 Master Builder

6056 – Back D

May 12, 2023May 19, 2023 Master Builder

1558 – Back A

December 18, 2021December 18, 2021 Master Builder

6367 – Back B

February 17, 2023May 19, 2023 Master Builder

6643 – Back A

July 2, 2024July 2, 2024 Master Builder

EXPLORE MORE OFFICIAL SETS

1687: Midnight Transport
Airport Classic Town Large Builds Official Sets Town Town Sets 

1687: Midnight Transport

January 25, 2022January 25, 2022 Master Builder

Year Released: 1993BricklinkInstructions

6874: Moon Rover
Classic Space Classic Space Sets Official Sets Small Builds Space 

6874: Moon Rover

November 6, 2023November 6, 2023 Master Builder
6296: Shipwreck Island
Medium Builds Official Sets Pirates Pirates I Pirates Sets 

6296: Shipwreck Island

January 12, 2022January 12, 2022 Master Builder
6454: Countdown Corner
Medium Builds Official Sets Space Port Town Town Sets 

6454: Countdown Corner

July 14, 2021July 14, 2021 Master Builder
7134: A-wing Fighter
Episode IV/V/VI Medium Builds Official Sets Star Wars Star Wars Sets 

7134: A-wing Fighter

December 29, 2021December 29, 2021 Master Builder
6861: X-1 Patrol Craft
Classic Space Classic Space Sets Official Sets Small Builds Space 

6861: X-1 Patrol Craft

May 4, 2020May 4, 2020 Master Builder
6049: Viking Voyager
Castle Castle Sets Lion Knights Official Sets Small Builds 

6049: Viking Voyager

June 30, 2022June 30, 2022 Master Builder
4565: Freight and Crane Railway
9V Extra Large Builds Official Sets Town Train Train Sets 

4565: Freight and Crane Railway

January 5, 2026January 5, 2026 Master Builder
2788: Katie’s Kitchen
Duplo Duplo Sets Official Sets Playhouse Small Builds 

2788: Katie’s Kitchen

July 10, 2024July 10, 2024 Master Builder
6510: Mud Runner
Official Sets Race Town Town Sets Very Small Builds 

6510: Mud Runner

May 8, 2022May 8, 2022 Master Builder
6894: Invader
Blacktron Blacktron Sets Medium Builds Official Sets 

6894: Invader

November 20, 2019November 20, 2019 Master Builder
725: Basic Building Set
Basic Extra Large Builds Official Sets Universal Building Set 

725: Basic Building Set

July 22, 2024July 22, 2024 Master Builder
8002: Destroyer Droid
Episode I Extra Large Builds Official Sets Star Wars Star Wars Sets Star Wars Technic Technic 

8002: Destroyer Droid

August 17, 2023September 1, 2023 Master Builder
3051: Blaze Attack
Medium Builds Ninja Ninja Alternate Builds Ninja Official Sets Official Sets 

3051: Blaze Attack

October 26, 2026October 26, 2026 Master Builder
6097: Night Lord’s Castle
Box Story Castle Castle Sets Extra Large Builds Fright Knights Official Sets 

6097: Night Lord’s Castle

March 1, 2023March 17, 2025 Master Builder
379: Bus Station
Classic Town Medium Builds Official Sets Town Town Sets Traffic 

379: Bus Station

April 10, 2021May 31, 2023 Master Builder

BOXES

INSTRUCTIONS

FAVORITES

MINIFIGS

About This Site

Logo
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.