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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
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    • Technic
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    • Universal Building Set
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    • Misc
  • USEFUL LINKS
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    • How BOTBB was Built
  • THIS IS AN INDEPENDENT SITE NOT AUTHORIZED OR SPONSORED BY THE LEGO GROUP

Concepts and Prototypes

Bjarne Tveskov Concepts and Prototypes Space Spectron 

Space Skeletal Horse Concept

January 22, 2026January 22, 2026 Master Builder 6556 Views

MiscTheme: ? Excerpt from LEGO® Space: 1978-1992, Page 160, Interview with Bjarne Panduro Tveskov, “And I remember in 1991 we

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ABCs Bjarne Tveskov Concepts and Prototypes Space Spectron 

Spectron Concept

January 22, 2026January 23, 2026 Master Builder 6885 Views

MiscTheme: Spectron Excerpt from LEGO® Space: 1978-1992, Page 154, Interview with Bjarne Panduro Tveskov, “I did design a few of

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Blacktron Blacktron Alternate Builds Captain Indigo Concepts and Prototypes Instructions Added LEGO Builders Club LEGO Magazine Space Very Small Alt Build Very Small Builds 

T42

March 9, 2025March 22, 2025 Master Builder 7575 Views

MiscBuild: T42 Instructions: View PDF | Download .io File Also Pictured: Blacktron Time Machine Bricks n Pieces: Spring 1988 – Page 4UK LEGO

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Blacktron Blacktron Alternate Builds Captain Indigo Concepts and Prototypes Instructions Added LEGO Builders Club LEGO Magazine Small Alt Build Small Builds Space 

Blacktron Time Machine

March 1, 2025March 22, 2025 Master Builder 7009 Views

MiscBuild: Blacktron Time Machine Instructions: View PDF | Download .io File Also pictured: T42 Bricks n Pieces: Spring 1988 – Page 4UK LEGO

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ABCs Concepts and Prototypes Sea People Sea-Tron Space 

Sea People

February 12, 2025February 12, 2025 Master Builder 6477 Views

MiscTheme: Seatron, Aquadome *Alternate Build Connection: Aquazone BrickJournal: Issue 6 Volume 2 – Page 43TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal

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ABCs Concepts and Prototypes Sea People Sea-Tron Space 

Aquadome

February 11, 2025February 18, 2025 Master Builder 7134 Views

MiscTheme: Seatron, Sea People *Alternate Build Connection: Aquazone, 6195: Neptune Discovery Lab (Aqua Dome 7), 6199: Hydro Crystalization Station LEGO®

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Concepts and Prototypes Grey:tron Grøntrøn Space 

Greytron

February 11, 2025February 11, 2025 Master Builder 8651 Views

MiscTheme: Greytron (Not Official) BrickJournal: Issue 6 Volume 2 – Page 42TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives LEGO®

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Concepts and Prototypes LEGO Builders Club LEGO Magazine You Can Build This 

Swinging On A Star

February 6, 2025March 22, 2025 Master Builder 6741 Views

MiscBuild: Would You Like to Swing on a StarSubmitted By: USERInstructions: Also pictured: Islander Mask Brick Kicks: Fall 1994 –

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ABCs Adventurers Adventurers Alternate Builds Concepts and Prototypes Desert You Can Build This 

Desert Buggy

February 6, 2025March 22, 2025 Master Builder 6618 Views

MiscBuild: Desert BuggySubmitted By: USERInstructions: *Alternate Build Connection: 5918: Scorpion Detector LEGO Mania Magazine: May-June 1998 – Page 7US LEGO

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ABCs Concepts and Prototypes Futuron Futuron Alternate Builds LEGO Builders Club LEGO Magazine Space You Can Build This 

Space Sunglasses

February 6, 2025March 22, 2025 Master Builder 6964 Views

MiscBuild: Space SunglassesSubmitted By: USERInstructions: *Alternate Build Connection: 6990: Futuron Monorail Transport System Brick Kicks: Fall 1989 – Page 7US LEGO

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Concepts and Prototypes LEGO Builders Club LEGO Magazine 

Marble Run

February 5, 2025March 22, 2025 Master Builder 6771 Views

MiscBuild: Marble RunSubmitted By: USERInstructions: Bricks n Pieces: Autumn 1987 – Page 10UK LEGO Club Magazine 

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ABCs Concepts and Prototypes Islanders LEGO Builders Club LEGO Magazine Pirates You Can Build This 

Islander Mask

January 26, 2025March 22, 2025 Master Builder 7004 Views

MiscBuild: Islander MaskSubmitted By: USERInstructions: *Alternate Build Connection: Islanders Also pictured: Swinging On A Star Brick Kicks: Fall 1994 –

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ABCs Aquazone Concepts and Prototypes LEGO Magazine You Can Build This 

Aqua Rover

January 18, 2025December 31, 2025 Master Builder 6797 Views

MiscBuild: Aqua Rover (Inspired by Aqua Cat)Submitted By: USERInstructions: *Alternate Build Connection: 6150: Crystal Detector LEGO Mania Magazine: May-June 1998 –

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Concepts and Prototypes M:Tron M:Tron Alternate Builds Space 

M:Tron Prototypes

January 23, 2024February 12, 2025 Master Builder 10273 Views

MiscTheme: M:Tron, Rtron (Not Official) BrickJournal: Issue 6 Volume 2 – Page 40TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives BrickJournal:

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Classic Space Classic Space Alternate Builds Concepts and Prototypes Space 

Classic Space Moon Base Concept

January 1, 2024February 12, 2025 Master Builder 6993 Views

MiscTheme: Classic Space LEGO® Space: 1978-1992 – Page 156Published: 2023By: Tim JohnsonDark Horse Books Build: TBDSubmitted By: USERInstructions

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Classic Space Classic Space Alternate Builds Concepts and Prototypes Space 

Robot Prototypes

January 1, 2024February 11, 2025 Master Builder 6891 Views

MiscTheme: Classic Space LEGO® Space: 1978-1992 – Page 156Published: 2023By: Tim JohnsonDark Horse Books Build 1: Build: 2: Build 3:

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Classic Space Classic Space Alternate Builds Concepts and Prototypes Space 

Space Technic Concept

January 1, 2024February 11, 2025 Master Builder 6676 Views

MiscTheme: Space Technic LEGO® Space: 1978-1992 – Page 156Published: 2023By: Tim JohnsonDark Horse Books Build: TBDSubmitted By: USERInstructions

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Concepts and Prototypes 

LEGO® Space: 1978-1992

January 1, 2024January 23, 2024 Master Builder 4446 Views

MiscPublished: 2023By: Tim JohnsonDark Horse Books

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Concepts and Prototypes Instructions Added Medium Alt Build Medium Builds R-TRON R:Tron Space 

Rtron

August 14, 2023February 12, 2025 Master Builder 7894 Views

MiscTheme: Rtron (Not Official), M:Tron Prototypes BrickJournal: Issue 6 Volume 2 – Page 41TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO

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Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 2

June 24, 2023August 15, 2023 Master Builder 3989 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Transforming Vehicle Instructions: View PDF

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Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 1

June 24, 2023August 15, 2023 Master Builder 3933 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Walker Instructions: View PDF

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Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 5

June 22, 2023August 15, 2023 Master Builder 3593 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Powersuit #2 Instructions: View PDF

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Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 12 Page 77 – Proto 1

June 22, 2023August 15, 2023 Master Builder 3816 Views

BrickJournal Issue 12TwoMorrows PublishingPhoto credit the LEGO® Group and Mark Stafford Name: M-Tron Forklift Mecha Instructions: View PDF

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ABCs Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 4

June 21, 2023August 15, 2023 Master Builder 3872 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Powersuit Instructions: View PDF *Alternate Build Connection: 7703

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ABCs Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 3

June 21, 2023August 15, 2023 Master Builder 3752 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Crane Instructions: View PDF *Alternate Build Connection: 6352:

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ABCs Classic Space Classic Space Alternate Builds Concepts and Prototypes Instructions Added Large Alt Build Space 

Classic Space Remote Controlled Vehicle

May 26, 2023February 12, 2025 Master Builder 6630 Views

MiscTheme: Classic Space BrickJournal: Issue 6 Volume 2 – Page 39TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: Classic

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ABCs Concepts and Prototypes Sea People Sea-Tron Space 

Seatron

February 23, 2023February 12, 2025 Master Builder 7242 Views

MiscTheme: Seatron, Sea People, Aquadome *Alternate Build Connection: Aquazone BrickJournal: Issue 6 Volume 2 – Page 43TwoMorrows PublishingPhoto Credit: Niels

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Concepts and Prototypes Sea People Sea-Tron Space 

BrickJournal Issue 6 Volume 2 Page 43 – Proto 1

February 23, 2023August 15, 2023 Master Builder 6229 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives

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Concepts and Prototypes Sea People Sea-Tron Space 

BrickJournal Issue 6 Volume 2 Page 43 – Concept 1

February 23, 2023August 15, 2023 Master Builder 3602 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives

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Concepts and Prototypes Space 

Blacktron II Prototypes

February 23, 2023February 11, 2025 Master Builder 7564 Views

MiscTheme: Blacktron II BrickJournal Issue 6 Volume 2 – Page 42TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Build 1:

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Concepts and Prototypes Grey:tron Grøntrøn Space 

BrickJournal Issue 6 Volume 2 Page 42 – Concept 1

February 23, 2023August 15, 2023 Master Builder 3658 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives

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Concepts and Prototypes Space 

Alien Prototype

February 23, 2023February 12, 2025 Master Builder 7263 Views

MiscTheme: Space BrickJournal: Issue 6 Volume 2 – Page 41TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Build: TBDSubmitted By:

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Concepts and Prototypes Space Space Police I Space Police I Alternate Builds Space Police II Space Police II Alternate Builds 

Space Police II Concept

February 23, 2023February 11, 2025 Master Builder 7862 Views

MiscTheme: Space Police II BrickJournal: Issue 6 Volume 2 – Page 39TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Build

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ABCs Blacktron Blacktron Alternate Builds Blacktron II Blacktron II Alternate Builds Concepts and Prototypes Space 

Blacktron Concept

February 23, 2023February 11, 2025 Master Builder 7276 Views

MiscTheme: Blacktron BrickJournal: Issue 6 Volume 2 – Page 39TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Build 1: TBDSubmitted

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Concepts and Prototypes 

BrickJournal Issue 6 Volume 2

February 23, 2023August 15, 2023 Master Builder 4564 Views

MiscPublished: Summer 2009TwoMorrows Publishing

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Concepts and Prototypes 

BrickJournal Issue 12

February 23, 2023August 15, 2023 Master Builder 3600 Views

MiscPublished: October 2010TwoMorrows Publishing

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EXPLORE MORE OFFICIAL SETS

6077: Knight’s Procession
Castle Castle Sets Classic Castle Official Sets Very Small Builds 

6077: Knight’s Procession

July 13, 2021July 13, 2021 Master Builder

Year Released: 1981Bricklink

1965: Basic Building Set
Basic Official Sets Universal Building Set Very Small Builds 

1965: Basic Building Set

March 6, 2026March 6, 2026 Master Builder
6536: Aero Hawk
Airport Classic Town Official Sets Small Builds Town Town Sets 

6536: Aero Hawk

January 22, 2026January 22, 2026 Master Builder
891: Two-Man Scooter
Classic Space Classic Space Sets Official Sets Small Builds Space 

891: Two-Man Scooter

March 15, 2024March 15, 2024 Master Builder
4705: Snape’s Class
Harry Potter Harry Potter Sets Medium Builds Official Sets Sorcerer's Stone 

4705: Snape’s Class

April 16, 2021April 16, 2021 Master Builder
7151: Sith Infiltrator
Episode I Medium Builds Official Sets Star Wars Star Wars Sets 

7151: Sith Infiltrator

September 1, 2023April 22, 2026 Master Builder
6999: Cyber Saucer with Promotional Mask
Box Plus Mask Medium Builds Official Sets UFO UFO Sets 

6999: Cyber Saucer with Promotional Mask

December 16, 2025December 16, 2025 Master Builder
6892: Modular Space Transport
ABCs Classic Space Classic Space Sets Medium Builds Official Sets Space 

6892: Modular Space Transport

November 17, 2021July 31, 2023 Master Builder
6812: Grid Trekkor
Bjarne Tveskov Blacktron II Blacktron II Sets Official Sets Space Very Small Builds 

6812: Grid Trekkor

February 12, 2021July 29, 2023 Master Builder
6367: Truck
Cargo Classic Town Medium Builds Official Sets Town Town Sets 

6367: Truck

February 17, 2023February 17, 2023 Master Builder
6926: Mobile Recovery Vehicle
Classic Space Classic Space Sets Medium Builds Official Sets Space 

6926: Mobile Recovery Vehicle

October 12, 2021October 12, 2021 Master Builder
7101: Lightsaber Duel
Episode I Official Sets Small Builds Star Wars Star Wars Sets 

7101: Lightsaber Duel

October 28, 2021October 28, 2021 Master Builder
1906: Majisto’s Tower
Box Plus Castle Castle Sets Dragon Knights Medium Builds Official Sets Playscape/Play Stage Box 

1906: Majisto’s Tower

August 1, 2023October 8, 2024 Master Builder
7411: Tygurah’s Roar
Adventurers Adventurers Sets Box Story Official Sets Orient Expedition Small Builds 

7411: Tygurah’s Roar

December 16, 2025December 16, 2025 Master Builder
4883: Gear Grinders
Designer Sets Designer Sets Alternate Builds Designer Sets Set Medium Builds Official Sets 

4883: Gear Grinders

August 2, 2021August 2, 2021 Master Builder
6280: Armada Flagship
Box Story Imperial Armada Large Builds Official Sets Pirates Pirates I Pirates Sets 

6280: Armada Flagship

July 13, 2021February 20, 2025 Master Builder

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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
  • 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.

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