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 M:Tron M:Tron Alternate Builds Medium Alt Build Medium Builds Space 

6923 – Back C

October 1, 2019October 25, 2021 Master Builder 5623 Views

From: 6923: Particle Ionizer
Name: Suborbital Voyager 1
Instructions: PDF (Photo Sequence)

Contributions

  1. Name and PDF (Photo Sequence) submitted on September 18, 2019 by: plastic.ati
  • ← 6923 – Back B
  • 6881: Lunar Rocket Launcher →

You May Also Like

6529 – Back C

July 14, 2022March 14, 2025 Master Builder

6687 – Back A

December 27, 2021December 27, 2021 Master Builder

Invention Adventure Activity Book – Page 25-26

April 28, 2024May 10, 2024 Master Builder

897 – Back D

September 16, 2019October 25, 2021 Master Builder

6487 – Back A

July 25, 2022July 25, 2022 Master Builder

4702 – Back A

August 8, 2024August 8, 2024 Master Builder

EXPLORE MORE OFFICIAL SETS

6376: Breezeway Cafe
Classic Town Food and Drink Medium Builds Official Sets Town Town Sets 

6376: Breezeway Cafe

February 3, 2021February 3, 2021 Master Builder

Year Released: 1990BricklinkInstructions

4032: Passenger Plane
Airport Medium Builds Official Sets Town Town Sets World City 

4032: Passenger Plane

December 29, 2021December 29, 2021 Master Builder
6835: Saucer Scout
Jørn Thomsen Official Sets Small Builds Spyrius Spyrius Sets 

6835: Saucer Scout

November 9, 2019July 29, 2023 Master Builder
6875: Hovercraft
Bjarne Tveskov Futron Sets Futuron Official Sets Small Builds 

6875: Hovercraft

September 16, 2019October 16, 2024 Master Builder
6679: Dark Shark
Classic Town Harbor Official Sets Small Builds Town Town Sets Wrecker 

6679: Dark Shark

December 28, 2021December 28, 2021 Master Builder
6357: Stunt ‘Copter N’ Truck
Classic Town Medium Builds Official Sets Town Town Sets Traffic 

6357: Stunt ‘Copter N’ Truck

January 28, 2022January 28, 2022 Master Builder
6083-2: Samurai Stronghold
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
4735: Slytherin
Chamber of Secrets Harry Potter Harry Potter Sets Official Sets Small Builds 

4735: Slytherin

February 27, 2023February 27, 2023 Master Builder
6249: Pirates Ambush
Medium Builds Official Sets Pirates Pirates I Pirates Sets 

6249: Pirates Ambush

November 16, 2019February 20, 2025 Master Builder
6991: Monorail Transport Base
Extra Large Builds Jørn Thomsen Official Sets Space Unitron Unitron Sets 

6991: Monorail Transport Base

September 28, 2019July 29, 2023 Master Builder
1597: Castle 3-Pack
Bonus/Value Pack Sets Bonus/Value Packs Official Sets Small Builds 

1597: Castle 3-Pack

July 22, 2024January 20, 2026 Master Builder
1499: Twin Starfire
Classic Space Classic Space Sets Official Sets Small Builds Space 

1499: Twin Starfire

February 3, 2021February 3, 2021 Master Builder
5925: Pontoon Plane
Adventurers Adventurers Sets Jungle Official Sets Small Builds 

5925: Pontoon Plane

March 5, 2026March 5, 2026 Master Builder
6687: Turbo Prop I
Airport Classic Town Official Sets Small Builds Town Town Sets 

6687: Turbo Prop I

December 27, 2021December 27, 2021 Master Builder
6086: Black Knight’s Castle
Black Knights Castle Castle Sets Extra Large Builds Niels Milan Pedersen Official Sets 

6086: Black Knight’s Castle

October 11, 2021July 29, 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

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.