Skip to content

Back of the Box Builds

LEGO Alternate Builds!

SETS
- Adventurers
- Aquazone
- Belville
- Building Set with People
- Castle
- Duplo
- Fabuland
- Harry Potter
- Holiday and Event
- LEGOLAND
- Model Team
- Pirates
- Space
- Star Wars
- Technic
- 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 3611 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

6274 – Back B

February 8, 2022February 21, 2025 Master Builder

6940: Alien Moon Stalker

September 12, 2019September 12, 2024 Master Builder

6814 – Back C

April 6, 2020October 25, 2021 Master Builder

6693 – Back D

May 10, 2022May 10, 2022 Master Builder

6781: SP-Striker

April 19, 2021July 29, 2023 Master Builder

6881 – Back C

October 2, 2019November 18, 2021 Master Builder

EXPLORE MORE OFFICIAL SETS

Bonus/Value Packs Castle Castle Sets Official Sets Royal Knights Small Builds Space Spyrius Spyrius Sets

1843: Space/Castle Value Pack

January 21, 2021September 13, 2023 Master Builder

Year Released: 1996BricklinkInstructionsContains Sets: 1843-2: {Spyrius Unknown} and 1843-3: {Royal Knights Unknown}

Medium Builds Official Sets Technic Technic Sets

8812: Aero Hawk II

January 22, 2026January 22, 2026 Master Builder

Medium Builds Official Sets Paradisa Town Town Sets

6404: Carriage Ride

January 6, 2025January 6, 2025 Master Builder

Adventurers Adventurers Sets Box Plus Desert Medium Builds Official Sets Storage Container

5909: Treasure Raiders set with Mummy Storage Container

October 8, 2024October 10, 2024 Master Builder

Box Story Fabuland Fabuland Sets Official Sets Small Builds

3676: Catherine Cat’s Fun Park

March 1, 2025March 1, 2025 Master Builder

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

4714: Gringott’s Bank

March 2, 2023March 2, 2023 Master Builder

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

4794: Alpha Team Command Sub

February 12, 2024February 21, 2024 Master Builder

Official Sets Paradisa Town Town Sets Very Small Builds

1761: Paradisa Speedboat

April 10, 2023April 10, 2023 Master Builder

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

4731: Dobby’s Release

January 23, 2024January 23, 2024 Master Builder

Classic Space Classic Space Sets Medium Builds Official Sets

6891: Gamma-V Laser Craft

September 13, 2019August 3, 2024 Master Builder

Classic Town Fire Official Sets Town Town Sets Very Small Builds

6611: Fire Chief’s Car

February 20, 2024February 20, 2024 Master Builder

ABCs Aquazone Aquazone Sets Hydronauts Official Sets Small Builds

6150 (6159): Crystal Detector

February 23, 2023February 18, 2025 Master Builder

Blacktron Blacktron Sets Large Builds Official Sets

6941: Battrax

September 13, 2019September 28, 2019 Master Builder

Episode III Official Sets Small Builds Star Wars Star Wars Sets

7255: General Grievous Chase

March 2, 2023March 2, 2023 Master Builder

Classic Town Harbor Official Sets Small Builds Town Town Sets Wrecker

6513: Glade Runner

May 10, 2022May 10, 2022 Master Builder

ABCs Classic Town Official Sets Small Builds Town Town Sets Traffic

6655: Auto & Tire Repair

June 4, 2023July 31, 2023 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
Belville
Building Set with People
Castle
Duplo
Fabuland
Harry Potter
Holiday and Event
LEGOLAND
Model Team
Pirates
Space
Star Wars
Technic
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.