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Back of the Box Builds

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
    • Submit Instructions!
    • New Instructions
    • New Official Sets
    • New Alternate Builds
    • Minifigs
    • Very Small Builds
    • Small Builds
    • Medium Builds
    • Large Builds
    • Extra Large Builds
    • How BOTBB was Built
  • THIS IS AN INDEPENDENT SITE NOT AUTHORIZED OR SPONSORED BY THE LEGO GROUP

Chamber of Secrets

Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Small Builds 

4719 – Back A

March 22, 2025March 22, 2025 Master Builder 2351 Views

From: 4719: Quality Quidditch SuppliesName: TBDSubmitted by: USERInstructions:

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

4719: Quality Quidditch Supplies

March 22, 2025March 22, 2025 Master Builder 4089 Views

Year Released: 2003BricklinkInstructions

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Very Small Builds 

4720 – Back C

July 9, 2024July 9, 2024 Master Builder 2283 Views

From: 4720: Knockturn AlleyName: TBDSubmitted by: USERInstructions:

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Medium Builds 

4720 – Back B

July 9, 2024July 9, 2024 Master Builder 2422 Views

From: 4720: Knockturn AlleyName: TBDSubmitted by: USERInstructions:

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Medium Builds 

4720 – Back A

July 9, 2024July 9, 2024 Master Builder 2328 Views

From: 4720: Knockturn AlleyName: TBDSubmitted by: USERInstructions:

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

4720: Knockturn Alley

July 9, 2024July 9, 2024 Master Builder 4052 Views

Year Released: 2003BricklinkInstructions

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Instructions Added Small Builds 

4735 – Back B

June 12, 2024June 17, 2024 Master Builder 2305 Views

From: 4735: SlytherinName: The Grumpy Dude Club Instructions: View PDF | Download .io File

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Instructions Added Small Builds 

4735 – Back A

June 12, 2024June 17, 2024 Master Builder 2483 Views

From: 4735: SlytherinName: Slytherin Secrets Instructions: View PDF | Download .io File

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Small Builds 

4730 – Back C

January 23, 2024 Master Builder 2329 Views

From: 4730: The Chamber of SecretsName: TBDSubmitted by: USERInstructions:

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Medium Builds 

4730 – Back B

January 23, 2024 Master Builder 2332 Views

From: 4730: The Chamber of SecretsName: TBDSubmitted by: USERInstructions:

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Medium Builds 

4730 – Back A

January 23, 2024January 23, 2024 Master Builder 2306 Views

From: 4730: The Chamber of SecretsName: TBDSubmitted by: USERInstructions:

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Chamber of Secrets Extra Large Builds Harry Potter Harry Potter Sets Official Sets 

4730: The Chamber of Secrets

January 23, 2024January 23, 2024 Master Builder 4191 Views

Year Released: 2002BricklinkInstructions

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Very Small Builds 

4731 – Back A

January 23, 2024January 23, 2024 Master Builder 2343 Views

From: 4731: Dobby’s ReleaseName: TBDSubmitted by: USERInstructions:

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

4731: Dobby’s Release

January 23, 2024January 23, 2024 Master Builder 3976 Views

Year Released: 2002BricklinkInstructions

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Small Builds 

4733 – Back B

March 3, 2023March 3, 2023 Master Builder 2270 Views

From: 4733: The Dueling ClubName: TBDSubmitted by: USERInstructions:

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Small Builds 

4733 – Back A

March 3, 2023March 3, 2023 Master Builder 2325 Views

From: 4733: The Dueling ClubName: TBDSubmitted by: USERInstructions:

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

4733: The Dueling Club

March 3, 2023March 3, 2023 Master Builder 4438 Views

Year Released: 2002BricklinkInstructions

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

4735: Slytherin

February 27, 2023February 27, 2023 Master Builder 3988 Views

Year Released: 2002BricklinkInstructions

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Small Builds 

4726 – Back B

February 27, 2023February 27, 2023 Master Builder 2142 Views

From: 4726: Quidditch PracticeName: TBDSubmitted by: USERInstructions:

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Alternate Builds Chamber of Secrets Harry Potter Harry Potter Alternate Builds Small Builds 

4726 – Back A

February 27, 2023February 27, 2023 Master Builder 2309 Views

From: 4726: Quidditch PracticeName: TBDSubmitted by: USERInstructions:

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

4726: Quidditch Practice

February 27, 2023February 27, 2023 Master Builder 3930 Views

Year Released: 2002BricklinkInstructions

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EXPLORE MORE OFFICIAL SETS

6817: Beta Buzzer
ABCs Insectoids Insectoids Sets Official Sets Space Very Small Builds 

6817: Beta Buzzer

June 1, 2022March 22, 2025 Master Builder

Year Released: 1998BricklinkInstructions *Alternate Build Connection: Space Creeper

6939: Saucer Centurion
ABCs Jørn Thomsen Medium Builds Official Sets Spyrius Spyrius Sets 

6939: Saucer Centurion

November 9, 2019October 1, 2024 Master Builder
6265: Sabre Island
Imperial Soldiers Official Sets Pirates Pirates I Pirates Sets Small Builds 

6265: Sabre Island

May 28, 2024May 28, 2024 Master Builder
6018: Battle Dragon
Black Knights Castle Castle Sets Official Sets Small Builds 

6018: Battle Dragon

October 5, 2019April 4, 2020 Master Builder
6367: Truck
Cargo Classic Town Medium Builds Official Sets Town Town Sets 

6367: Truck

February 17, 2023February 17, 2023 Master Builder
6825: Cosmic Comet
Classic Space Classic Space Sets Official Sets Small Builds 

6825: Cosmic Comet

September 12, 2019March 18, 2024 Master Builder
7256: Jedi Starfighter & Vulture Droid
Episode III Medium Builds Official Sets Star Wars Star Wars Sets 

7256: Jedi Starfighter & Vulture Droid

March 1, 2023May 12, 2023 Master Builder
6884: Aero-Module
Bjarne Tveskov Different Box Versions Futron Sets Futuron Official Sets Small Builds 

6884: Aero-Module

September 24, 2019March 17, 2024 Master Builder
5810: Vanity Fun
Belville Belville Sets Lion Knights Official Sets Playhouse Very Small Builds 

5810: Vanity Fun

April 10, 2021April 10, 2021 Master Builder
2151: Robo Raider
Medium Builds Official Sets Robo Force Robo Force Alternate Builds Robo Force Sets Space 

2151: Robo Raider

January 14, 2021January 14, 2021 Master Builder
6648: Mag Racer
Classic Town LL Link Official Sets Race Small Builds Town Town Sets 

6648: Mag Racer

November 19, 2020July 11, 2024 Master Builder
6071: Forestmen’s Crossing
Box Marketing Blurb Castle Castle Sets Forestmen Medium Builds Official Sets 

6071: Forestmen’s Crossing

October 23, 2019April 3, 2024 Master Builder
4762: Rescue from the Merpeople
Goblet of Fire Harry Potter Harry Potter Sets Medium Builds Official Sets 

4762: Rescue from the Merpeople

May 16, 2023May 16, 2023 Master Builder
6815: Hovertron
Exploriens Exploriens Sets Official Sets Space Very Small Builds 

6815: Hovertron

June 28, 2022June 28, 2022 Master Builder
510: Basic Building Set
Basic Official Sets Small Builds Universal Building Set 

510: Basic Building Set

July 11, 2024July 11, 2024 Master Builder
6790: Bandit’s Wheelgun
Cowboys Official Sets Very Small Builds Western Western Sets 

6790: Bandit’s Wheelgun

October 10, 2023October 10, 2023 Master Builder

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INSTRUCTIONS

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MINIFIGS

About This Site

Logo
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 © 2025 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.