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 Instructions Added Large Alt Build Large Builds Model Team Model Team Alternate Builds

5521 – Back A

January 29, 2026March 4, 2026 Master Builder 4659 Views

From: 5521: Sea Jet
Name: TBD ¹
Instructions: View PDF | Download .io File

Contributions

Name, PDF and .io file submitted on January 29, 2026 by: livi

← Space Skeletal Horse Concept
5581 – Back A →

You May Also Like

2551 – Back B

February 27, 2023February 27, 2023 Master Builder

6581 – Back D

September 14, 2023September 18, 2023 Master Builder

6665 – Back D

June 1, 2022June 2, 2022 Master Builder

920 – Back D

February 2, 2021August 30, 2023 Master Builder

6030 – Back C

May 10, 2022May 12, 2022 Master Builder

6952 – Back A

September 22, 2019August 16, 2023 Master Builder

EXPLORE MORE OFFICIAL SETS

Daniel August Krentz Imperial Soldiers Medium Builds Official Sets Pirates Pirates I Pirates Sets

6267: Lagoon Lock-Up

October 11, 2021July 29, 2023 Master Builder

Year Released: 1991Designer: Daniel August KrentzBricklinkInstructions

Black Knights Castle Castle Sets Official Sets Small Builds

1491: Dual Defender

October 11, 2021October 11, 2021 Master Builder

9V Medium Builds Official Sets Town Train Train Sets

4539: Manual Level Crossing

May 22, 2026May 22, 2026 Master Builder

Alpha Team Alpha Team Sets Medium Builds Mission Deep Sea Official Sets

4789: AT Aquatic Mech

February 12, 2024February 21, 2024 Master Builder

Alternate Instructions Included BIONICLE BIONICLE Sets Instructions Added Medium Alt Build Medium Builds Official Sets Titans

8593: Makuta

April 23, 2026April 23, 2026 Master Builder

Bonus/Value Pack Sets Futron Sets Futuron Official Sets Small Builds Space

1974-4: Star Quest

September 7, 2023September 8, 2023 Master Builder

ABCs Jørn Thomsen Medium Builds Official Sets Spyrius Spyrius Sets

6939: Saucer Centurion

November 9, 2019October 1, 2024 Master Builder

Castle Castle Sets Lion Knights Official Sets Small Builds

6012: Siege Cart

September 24, 2024September 24, 2024 Master Builder

Batman I BATMAN™ BATMAN™ Sets Large Builds Official Sets

7781: The Batmobile: Two-Face’s Escape

March 27, 2026March 27, 2026 Master Builder

Episode I Official Sets Star Wars Star Wars Sets Very Small Builds

7204: Jedi Defense II

June 27, 2022June 27, 2022 Master Builder

Airport Classic Town Official Sets Small Builds Town Town Sets

6341: Gas N’ Go Flyer

December 27, 2021December 27, 2021 Master Builder

Official Sets Town Town Jr Town Sets Traffic Very Small Builds

6422: Telephone Repair

July 28, 2020July 28, 2020 Master Builder

Classic Town Off-Road Official Sets Small Builds Town Town Sets

6641: 4-Wheelin’ Truck (Four Wheelin’ Truck)

May 7, 2022May 7, 2022 Master Builder

9V Extra Large Builds Official Sets Town Train Train Sets

4561: Railway Express with Transformer and Speed Regulator

January 5, 2026January 5, 2026 Master Builder

Aquanauts Aquazone Aquazone Sets Jørn Thomsen Official Sets Very Small Builds

6125: Sea Sprint 9

April 9, 2020July 29, 2023 Master Builder

Classic Space Classic Space Sets Large Builds Official Sets Space Super Model

1593: Super Model

February 3, 2021March 18, 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.