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 4092 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

6694 – Back B

July 10, 2022July 15, 2022 Master Builder

7119 – Back A

February 26, 2023February 26, 2023 Master Builder

6380 – Back E

February 14, 2023February 19, 2023 Master Builder

6813 – Back A

April 8, 2020October 25, 2021 Master Builder

6077 – Back A

July 13, 2021July 13, 2021 Master Builder

6972 – Back A

September 15, 2019November 21, 2023 Master Builder

EXPLORE MORE OFFICIAL SETS

Classic Town Construction Official Sets Town Town Sets Very Small Builds

6512: Landscape Loader

May 10, 2022May 10, 2022 Master Builder

Year Released: 1992BricklinkInstructions

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

4480: Jabba’s Palace

March 18, 2022March 18, 2022 Master Builder

Airport Bonus/Value Packs Castle Castle Sets Classic Town Forestmen Futron Sets Futuron Official Sets Small Builds Space Town

1974: Legoland Triple Pack

September 7, 2023September 7, 2023 Master Builder

Official Sets Race Town Town Sets Very Small Builds

6503: Sprint Racer

July 9, 2022July 9, 2022 Master Builder

Classic Town Extra Large Builds Gas Station Official Sets Town Town Sets Wrecker

6397: Gas N’ Wash Express

July 14, 2021July 14, 2021 Master Builder

Basic Large Builds Official Sets Universal Building Set

565: Build-N-Store Chest

December 28, 2023July 11, 2024 Master Builder

Classic Town Official Sets Police Town Town Sets Very Small Builds

600: Police Patrol

July 11, 2024July 11, 2024 Master Builder

Box Story Extra Large Builds Niels Milan Pedersen Official Sets Pirates Pirates I Pirates Sets

6285: Black Seas Barracuda

August 3, 2023February 20, 2025 Master Builder

Drome Racers Official Sets Racers Very Small Builds

4592: Red Monster

November 14, 2025November 14, 2025 Master Builder

Official Sets Racers Radio Control Small Builds

8369: Dirt Crusher RC (Yellow)

November 13, 2024November 13, 2024 Master Builder

ABCs Black Falcons Castle Castle Sets Large Builds Official Sets

6062: Battering Ram

October 11, 2021July 31, 2023 Master Builder

Official Sets Small Builds Space Port Town Town Sets

6465: Space Port Jet

March 3, 2025March 3, 2025 Master Builder

Islanders Medium Builds Official Sets Pirates Pirates I Pirates Sets

6262: King Kahuka’s Throne

June 1, 2022June 1, 2022 Master Builder

Official Sets Space UFO UFO Sets Very Small Builds

6800 (6816, Kabaya: Space 2): Cyber Blaster

October 4, 2024February 25, 2025 Master Builder

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

4707: Hagrid’s Hut

December 29, 2021December 29, 2021 Master Builder

Large Builds Model Team Model Team Sets Official Sets

5510: Off Road 4×4

February 10, 2026February 10, 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.