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 A

August 25, 2023March 14, 2025 Master Builder 4734 Views

From: 6901: Mobile Lab
Name: Space Lab Tower ¹
Instructions: View PDF | Download .io File

Contributions

Name, PDF and .io file submitted August 26, 2023 by: Mr.AstonishedRaccoon

← 6035 – Back D
6901 – Back B →

You May Also Like

7264 – Back A

April 15, 2026April 15, 2026 Master Builder

6571 – Inside C

August 10, 2026August 10, 2026 Master Builder

6561: Hot Rod Club

November 10, 2019June 3, 2026 Master Builder

6397 – Back C

June 8, 2022June 29, 2022 Master Builder

6883 – Back A

October 22, 2019September 11, 2023 Master Builder

1789 – Back C

July 18, 2020July 18, 2020 Master Builder

EXPLORE MORE OFFICIAL SETS

Indians Official Sets Very Small Builds Western Western Sets

2846: Indian Kayak

October 10, 2023October 10, 2023 Master Builder

Year Released: 1997BricklinkInstructions

Classic Space Classic Space Sets Medium Builds Official Sets

6927: All Terrain Vehicle

October 22, 2019October 22, 2019 Master Builder

Episode II Episode IV/V/VI Medium Builds Official Sets Star Wars Star Wars Sets

4500: Rebel Snowspeeder

April 9, 2020April 9, 2020 Master Builder

Large Builds Official Sets Space Unitron Unitron Sets

1793: Space Station Zenon

April 19, 2021April 19, 2021 Master Builder

Classic Space Classic Space Sets Official Sets Small Builds Space

1499: Twin Starfire

February 3, 2021February 3, 2021 Master Builder

Castle Castle Sets Lion Knights Official Sets Small Builds

6012: Siege Cart

September 24, 2024September 24, 2024 Master Builder

Adventurers Adventurers Sets Dino Island Medium Builds Official Sets

5935: Island Hopper

April 21, 2025April 21, 2025 Master Builder

Black Falcons Castle Castle Sets Daniel August Krentz Large Builds Official Sets

6073: Knight’s Castle

October 23, 2019July 29, 2023 Master Builder

Gears Medium Builds Official Sets Universal Building Set

801: Gear Set

December 17, 2025December 17, 2025 Master Builder

Chamber of Secrets Harry Potter Harry Potter Sets Medium Builds Official Sets

4720: Knockturn Alley

July 9, 2024June 23, 2026 Master Builder

Harry Potter Harry Potter Sets Large Builds Official Sets Sorcerer's Stone

4706: Forbidden Corridor

February 27, 2023February 27, 2023 Master Builder

Classic Town Fire Official Sets Town Town Sets Very Small Builds

6505: Fire Chief’s Car

July 8, 2022July 8, 2022 Master Builder

Islanders Medium Builds Official Sets Pirates Pirates I Pirates Sets

6264: Forbidden Cove

July 1, 2022July 1, 2022 Master Builder

Classic Space Classic Space Sets Official Sets Very Small Builds

6841: Mineral Detector

October 3, 2019October 3, 2019 Master Builder

Classic Town Official Sets Town Town Sets Traffic Very Small Builds

6613: Telephone Booth

November 6, 2024November 6, 2024 Master Builder

Castle Castle Sets Lion Knights Medium Builds Official Sets

6060: Knight’s Challenge

July 2, 2024October 1, 2024 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.