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 Aquazone Aquazone Alternate Builds Hydronauts Small Builds 

6150 – Back B

February 23, 2023February 23, 2023 Master Builder 3703 Views

From: 6150: Crystal Detector
Name: TBD
Submitted by: USER
Instructions

  • ← 6150 – Back A
  • 6150 – Back C →

You May Also Like

6190 – Back D

December 22, 2023January 1, 2024 Master Builder

4920 – Back C

March 1, 2023March 1, 2023 Master Builder

6848 – Back B

March 11, 2024March 11, 2024 Master Builder

6340 – Back C

December 29, 2021August 1, 2022 Master Builder

6596 – Back D

September 15, 2022September 15, 2022 Master Builder

4940: Granite Grinder

April 4, 2020April 4, 2020 Master Builder

EXPLORE MORE OFFICIAL SETS

7161: Gungan Sub
Large Builds Official Sets Star Wars Star Wars Sets 

7161: Gungan Sub

April 21, 2026April 21, 2026 Master Builder

Year Released: 1999BricklinkInstructions

1821: Rally Racers
ABCs Box Plus Classic Town Medium Builds Official Sets Playscape/Play Stage Box Race Town Town Sets 

1821: Rally Racers

February 10, 2025March 22, 2025 Master Builder
6155: Deep Sea Predator
Aquashark Aquazone Aquazone Sets Official Sets Small Builds 

6155: Deep Sea Predator

May 10, 2022May 10, 2022 Master Builder
2154: Robo Master
ABCs Box Story Large Builds Official Sets Robo Force Robo Force Sets Space 

2154: Robo Master

June 14, 2023February 11, 2025 Master Builder
6546: Slick Racer
Official Sets Town Town Sets Very Small Builds 

6546: Slick Racer

May 23, 2022May 23, 2022 Master Builder
6273: Rock Island Refuge
Box Story Large Builds Official Sets Pirates Pirates I Pirates Sets 

6273: Rock Island Refuge

July 4, 2024July 4, 2024 Master Builder
6646: Screaming Patriot
Classic Town Official Sets Race Small Builds Town Town Sets 

6646: Screaming Patriot

March 16, 2022March 16, 2022 Master Builder
10182: Café Corner
Creator Expert Extra Large Builds Modular Buildings Collection Official Sets 

10182: Café Corner

January 23, 2024January 23, 2024 Master Builder
6556: Scuba Squad
Divers Official Sets Small Builds Town Town Sets 

6556: Scuba Squad

June 28, 2022June 28, 2022 Master Builder
6982: Explorien Starship
Exploriens Exploriens Sets Extra Large Builds Official Sets 

6982: Explorien Starship

November 9, 2019December 13, 2024 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
725-3: Town Plan
Large Builds Official Sets Samsonite Samsonite Sets Town Town Sets 

725-3: Town Plan

October 9, 2024October 9, 2024 Master Builder
1895: Sky Patrol
Classic Town Official Sets Police Small Builds Town Town Sets 

1895: Sky Patrol

June 1, 2022June 1, 2022 Master Builder
6862: Secret Space Voyager
Large Builds M:Tron M:Tron Alternate Builds M:Tron Sets Official Sets Space Super Model 

6862: Secret Space Voyager

July 29, 2023July 29, 2023 Master Builder
6681: Police Van
Classic Town Official Sets Police Small Builds Town Town Sets 

6681: Police Van

October 13, 2021October 13, 2021 Master Builder
565: Build-N-Store Chest
Basic Large Builds Official Sets Universal Building Set 

565: Build-N-Store Chest

December 28, 2023July 11, 2024 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.