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

ABCs Aquazone Aquazone Sets Hydronauts Official Sets Small Builds

6150 (6159): Crystal Detector

February 23, 2023February 18, 2025 Master Builder 6421 Views

Year Released: 1998
Bricklink
Instructions

*Alternate Build Connection: Aqua Rover (LEGO Mania Magazine: May-June 1998)

Back A

Back A

← 6905 – Back D
6150 – Back A →

You May Also Like

7126 – Back A

July 30, 2023March 14, 2025 Master Builder

7252 – Back B

November 9, 2024November 10, 2024 Master Builder

6558: Shark Cage Cove

December 29, 2021December 29, 2021 Master Builder

6861: X-1 Patrol Craft

May 4, 2020May 4, 2020 Master Builder

194 – Back B

October 4, 2019November 18, 2021 Master Builder

6847 – Comic

September 14, 2025March 28, 2026 Master Builder

EXPLORE MORE OFFICIAL SETS

Extra Large Builds Official Sets Technic Technic Sets

857: Motorcycle

January 6, 2025January 6, 2025 Master Builder

Year Released: 1979BricklinkInstructions

Arctic Medium Builds Official Sets Town Town Sets

6573: Arctic Expedition

May 22, 2026May 22, 2026 Master Builder

Classic Space Classic Space Sets Official Sets Small Builds Space

6880: Surface Explorer

May 4, 2020May 4, 2020 Master Builder

Medium Builds Official Sets Pirates Pirates I Pirates Sets

6250: Cross Bone Clipper

February 20, 2025February 20, 2025 Master Builder

Castle Castle Sets Dragon Knights Official Sets Small Builds

6020: Magic Shop

December 28, 2021December 28, 2021 Master Builder

Bonus/Value Packs Imperial Guards Official Sets Pirates Pirates Alternate Builds Pirates I Small Builds

1795 – Side R

March 30, 2026March 30, 2026 Master Builder

ABCs Jørn Thomsen Medium Builds Official Sets Spyrius Spyrius Sets

6939: Saucer Centurion

November 9, 2019October 1, 2024 Master Builder

Classic Space Classic Space Sets Large Builds Official Sets

6972: Polaris I Space Lab

September 12, 2019November 21, 2023 Master Builder

ABCs Box Plus Insectoids Insectoids Sets Mask Official Sets Small Builds Space

6909: Sonic Stinger with Promotional Mask

October 4, 2024March 22, 2025 Master Builder

Bonus/Value Pack Alternate Builds Castle Castle Alternate Builds Instructions Added Official Sets Royal Knights Small Alt Build Small Builds Space Spyrius Spyrius Alternate Builds

1843 – Bottom

January 22, 2021March 14, 2025 Master Builder

Cargo Classic Town Medium Builds Official Sets Town Town Sets

6367: Truck

February 17, 2023February 17, 2023 Master Builder

Medium Builds Official Sets Super Model Technic Technic Alternate Builds Technic Sets

120270: The Great Technic Racer

March 8, 2025March 8, 2025 Master Builder

9V Official Sets Small Builds Town Train Train Sets

4525: Road and Rail Repair

July 22, 2026July 22, 2026 Master Builder

Black Knights Castle Castle Sets Extra Large Builds Niels Milan Pedersen Official Sets

6085: Black Monarch’s Castle

July 13, 2021July 29, 2023 Master Builder

Castle Castle Sets Dragon Knights Official Sets Very Small Builds

1732 (1712): Crossbow Cart

August 19, 2024October 8, 2024 Master Builder

Medium Builds Official Sets Town Town Sets

6561: Hot Rod Club

November 10, 2019June 3, 2026 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.