Skip to content

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
THIS IS AN INDEPENDENT SITE NOT AUTHORIZED OR SPONSORED BY THE LEGO GROUP

Alternate Builds Classic Space Classic Space Alternate Builds Instructions Added Medium Alt Build Medium Builds Space

6901 – Back C

August 28, 2023March 14, 2025 Master Builder 4221 Views

From: 6901: Mobile Lab
Name: Convertible Cruiser Mobile Lab ¹
Instructions: View PDF | Download .io File

Contributions

Name, PDF and .io file submitted August 28, 2023 by: Mr.AstonishedRaccoon

← 854: Go-Kart
6901 – Back D →

You May Also Like

6234 – Back C

May 23, 2022May 23, 2022 Master Builder

6334 – Back A

June 27, 2022June 27, 2022 Master Builder

6402 – Back A

October 5, 2019November 18, 2021 Master Builder

6532 – Back B

November 19, 2020November 19, 2020 Master Builder

6699 – Back C

October 28, 2025October 28, 2025 Master Builder

6660 – Back A

June 23, 2025June 23, 2025 Master Builder

EXPLORE MORE OFFICIAL SETS

ABCs Aquazone Aquazone Sets Box Story Extra Large Builds Hydronauts Official Sets Stingrays

6199: Hydro Crystalization Station

February 18, 2025February 18, 2025 Master Builder

Year Released: 1998BricklinkInstructions *Alternate Build Connection: Aquadome The box reads, “These underwater heroes search the sea for the powerful Hydrolator crystal. But

ABCs Classic Space Classic Space Sets Large Builds Official Sets

6952: Solar Power Transporter

September 22, 2019March 20, 2025 Master Builder

Islanders Medium Builds Official Sets Pirates Pirates I Pirates Sets

6264: Forbidden Cove

July 1, 2022July 1, 2022 Master Builder

Basic Extra Large Builds Official Sets Universal Building Set

735: Basic Building Set

September 15, 2022September 15, 2022 Master Builder

Classic Space Classic Space Sets Official Sets Small Builds Space

1499: Twin Starfire

February 3, 2021February 3, 2021 Master Builder

ABCs Castle Castle Sets Extra Large Builds Lion Knights Niels Milan Pedersen Official Sets

6080: King’s Castle

October 5, 2019August 16, 2023 Master Builder

Harry Potter Harry Potter Sets Official Sets Prisoner of Azkaban Very Small Builds

4750: Draco’s Encounter with Buckbeak

May 16, 2023May 16, 2023 Master Builder

Black Knights Castle Castle Sets Official Sets Very Small Builds

6009: Black Knight

April 9, 2020April 9, 2020 Master Builder

Extreme Team Official Sets Small Builds Town Town Sets

6580: Land Jet 7

June 25, 2025June 25, 2025 Master Builder

Castle Castle Sets Lion Knights Official Sets Small Builds

6012: Siege Cart

September 24, 2024September 24, 2024 Master Builder

Creator Expert Extra Large Builds Modular Buildings Collection Official Sets

10182: Café Corner

January 23, 2024January 23, 2024 Master Builder

ABCs Castle Castle Sets Classic Castle Daniel August Krentz Different Set Numbers Duplicate Set Number Extra Large Builds Official Sets

375-2 (6075-2): Castle

November 8, 2019September 5, 2025 Master Builder

Bonus/Value Packs Castle Castle Alternate Builds Dragon Knights Official Sets Small Builds

1794 – Side R

March 30, 2026March 30, 2026 Master Builder

Official Sets Pirates Pirates I Pirates Sets Very Small Builds

6235: Buried Treasure

May 23, 2022May 23, 2022 Master Builder

Castle Castle Sets Fright Knights Official Sets Small Builds

6037: Witch’s Windship

December 29, 2021December 29, 2021 Master Builder

Launch Command Medium Builds Official Sets Town Town Sets

6336: Launch Response Unit

July 12, 2021July 12, 2021 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
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.