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

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 – Side L

January 22, 2021March 14, 2025 Master Builder 5147 Views

From: 1843: Space / Castle Value Pack
Name: Space / Castle Secret Armory ¹
Instructions: View PDF | Download .io File

Contributions

Name, PDF, and .io file submitted on January 29, 2021 by: Mr.AstonishedRaccoon

← 1843: Space/Castle Value Pack
1843 – Side R →

You May Also Like

6039 – Back A

August 18, 2023August 22, 2023 Master Builder

6312: Straight Road Plates

October 10, 2022October 10, 2022 Master Builder

6506 – Back B

November 22, 2025November 25, 2025 Master Builder

6593 – Back E

February 9, 2022July 20, 2022 Master Builder

924 – Bottom A

September 11, 2023September 11, 2023 Master Builder

4593: Zero Hurricane & Red Blizzard

January 27, 2025February 21, 2025 Master Builder

EXPLORE MORE OFFICIAL SETS

Castle Castle Sets Crusaders Daniel August Krentz Extra Large Builds Official Sets

6081: King’s Mountain Fortress

June 30, 2022July 29, 2023 Master Builder

Year Released: 1990Designer: Daniel August KrentzBricklinkInstructions

Classic Space Classic Space Sets Official Sets Space Very Small Builds

6806: Surface Hopper

April 16, 2021April 16, 2021 Master Builder

Hospital LEGOLAND Medium Builds Official Sets

770: Rescue Set

September 15, 2022February 14, 2024 Master Builder

Episode IV/V/VI Extra Large Builds Official Sets Star Wars Star Wars Sets

6211: Imperial Star Destroyer

February 6, 2024February 7, 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

Box Plus FreeStyle FreeStyle Official Sets Official Sets Poster Small Builds

4150: FreeStyle Building Set

December 17, 2025December 17, 2025 Master Builder

Boat Fire Medium Builds Official Sets

775: Fire Fighter Ship

July 22, 2024July 22, 2024 Master Builder

Airport Classic Town Official Sets Small Builds Town Town Sets

6615: Eagle Stunt Flyer

January 5, 2022January 5, 2022 Master Builder

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

6074: Black Falcon’s Fortress

October 14, 2021July 29, 2023 Master Builder

Classic Town Coast Guard Official Sets Small Builds Town Town Sets

6518: Baja Buggy

May 23, 2022May 23, 2022 Master Builder

Box Marketing Blurb Classic Town Extra Large Builds Official Sets Town Town Sets Traffic

6390: Main Street

February 10, 2023April 3, 2024 Master Builder

Blacktron Blacktron Sets Large Builds Official Sets

6941: Battrax

September 13, 2019September 28, 2019 Master Builder

Airport Classic Town Medium Builds Official Sets Town Town Sets

2532: Aircraft and Ground Crew

December 28, 2021December 28, 2021 Master Builder

Castle Castle Sets Lion Knights Official Sets Small Builds

6010: Supply Wagon

July 13, 2021July 13, 2021 Master Builder

Basic Set Duplo Duplo Sets Official Sets Very Small Builds

1657: Bird

December 28, 2021December 29, 2021 Master Builder

Large Builds Official Sets Star Wars Star Wars Sets

7140: X-wing Fighter

November 10, 2019April 17, 2020 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.