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 Medium Alt Build Medium Builds Spyrius Spyrius Alternate Builds 

6939 – Back B

February 5, 2023February 13, 2023 Master Builder 5638 Views

From: 6939: Saucer Centurion
Name: Spy-star Defender 1
Instructions: View PDF | Download .io File

Contributions

  1. Name, PDF and .io file submitted on February 5, 2023 by: Valdis
  • ← 6939 – Back A
  • 6939 – Back C →

You May Also Like

1371 – Instructions A

January 6, 2022June 4, 2024 Master Builder

6543 – Back A

July 22, 2022July 22, 2022 Master Builder

1490: Town Bank

January 23, 2024January 23, 2024 Master Builder

7781 – Instructions B

March 27, 2026March 27, 2026 Master Builder

6642 – Back C

April 8, 2020April 8, 2020 Master Builder

6041: Armor Shop

September 25, 2024September 25, 2024 Master Builder

EXPLORE MORE OFFICIAL SETS

6805: Astro Dasher
Classic Space Classic Space Sets Official Sets Space Very Small Builds 

6805: Astro Dasher

December 10, 2025December 10, 2025 Master Builder

Year Released: 1985BricklinkInstructions

6938: Scorpion Detector
Exploriens Exploriens Sets Medium Builds Official Sets 

6938: Scorpion Detector

March 21, 2023March 5, 2026 Master Builder
7186: Watto’s Junkyard
Episode I Extra Large Builds Official Sets Star Wars Star Wars Sets 

7186: Watto’s Junkyard

April 21, 2026April 21, 2026 Master Builder
6543: Sail N’ Fly Marina
Classic Town Extra Large Builds Harbor Official Sets Town Town Sets Wrecker 

6543: Sail N’ Fly Marina

July 22, 2022July 22, 2022 Master Builder
Kabaya: Alpha Team 2
Alpha Team Alpha Team Sets Mission Deep Sea Official Sets Very Small Builds 

Kabaya: Alpha Team 2

September 9, 2024September 9, 2024 Master Builder
6814: Ice Tunnelator
Ice Planet 2002 Ice Planet 2002 Sets Jørn Thomsen Official Sets Space Very Small Builds 

6814: Ice Tunnelator

April 6, 2020April 2, 2025 Master Builder
6718: Raindance Ridge (Rain Dance Ridge)
Indians Jørn Thomsen Official Sets Small Builds Western Western Sets 

6718: Raindance Ridge (Rain Dance Ridge)

August 4, 2020July 29, 2023 Master Builder
6512: Landscape Loader
Classic Town Construction Official Sets Town Town Sets Very Small Builds 

6512: Landscape Loader

May 10, 2022May 10, 2022 Master Builder
7473: Street Sprinter vs. Mutant Lizard
Dino Attack Official Sets Small Builds 

7473: Street Sprinter vs. Mutant Lizard

March 21, 2023March 21, 2023 Master Builder
194: Family
Building Set with People Building Set with People Sets Official Sets Small Builds 

194: Family

October 4, 2019October 6, 2019 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
6660: Hook and Haul Wrecker
Classic Town Off-Road Official Sets Small Builds Town Town Sets 

6660: Hook and Haul Wrecker

June 23, 2025June 23, 2025 Master Builder
928 (497): Galaxy Explorer
ABCs Classic Space Classic Space Sets Different Box Versions Different Set Numbers Jens Nygaard Knudsen Large Builds LL Link Official Sets Space 

928 (497): Galaxy Explorer

November 24, 2020August 15, 2024 Master Builder
6038: Wolfpack Renegades
Castle Castle Sets Official Sets Small Builds Wolfpack 

6038: Wolfpack Renegades

October 14, 2021October 14, 2021 Master Builder
7127: Imperial AT-ST
Episode IV/V/VI Official Sets Small Builds Star Wars Star Wars Sets 

7127: Imperial AT-ST

December 29, 2021December 29, 2021 Master Builder
6232: Skeleton Crew
Official Sets Pirates Pirates I Pirates Sets Very Small Builds 

6232: Skeleton Crew

July 13, 2021July 13, 2021 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.