Skip to content
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

Hydronauts

Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Medium Builds Stingrays 

6199 – Back B

February 18, 2025February 18, 2025 Master Builder 2924 Views

From: 6199: Hydro Crystalization StationName: TBDSubmitted by: USERInstructions:

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Medium Builds Stingrays 

6199 – Back A

February 18, 2025February 18, 2025 Master Builder 2884 Views

From: 6199: Hydro Crystalization StationName: TBDSubmitted by: USERInstructions:

Read more
ABCs Aquazone Aquazone Sets Box Story Extra Large Builds Hydronauts Official Sets Stingrays 

6199: Hydro Crystalization Station

February 18, 2025February 18, 2025 Master Builder 5706 Views

Year Released: 1998BricklinkInstructions *Alternate Build Connection: Aquadome The box reads, “These underwater heroes search the sea for the powerful Hydrolator crystal. But

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Medium Builds 

6180 – Back C

February 18, 2025February 18, 2025 Master Builder 2730 Views

From: 6180: Hydro Search SubName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Medium Builds 

6180 – Back B

February 18, 2025February 18, 2025 Master Builder 2676 Views

From: 6180: Hydro Search SubName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Medium Builds 

6180 – Back A

February 18, 2025February 18, 2025 Master Builder 2714 Views

From: 6180: Hydro Search SubName: TBDSubmitted by: USERInstructions

Read more
Aquazone Aquazone Sets Box Story Hydronauts Large Builds Official Sets 

6180: Hydro Search Sub

February 18, 2025February 18, 2025 Master Builder 4974 Views

Year Released: 1998BricklinkInstructions The box reads, “These underwater heroes search the sea for the powerful Hydrolator crystal. But watch out – Enemy

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Small Builds 

6110 – Back B

February 13, 2025February 13, 2025 Master Builder 2729 Views

From: 6110: Solo SubName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Small Builds 

6110 – Back A

February 13, 2025February 13, 2025 Master Builder 2690 Views

From: 6110: Solo SubName: TBDSubmitted by: USERInstructions

Read more
Aquazone Aquazone Sets Hydronauts Official Sets Small Builds 

6110: Solo Sub

February 13, 2025February 13, 2025 Master Builder 4834 Views

Year Released: 1998BricklinkInstructions

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Small Builds 

6150 – Back C

February 23, 2023February 23, 2023 Master Builder 2584 Views

From: 6150: Crystal DetectorName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Small Builds 

6150 – Back B

February 23, 2023February 23, 2023 Master Builder 2348 Views

From: 6150: Crystal DetectorName: TBDSubmitted by: USERInstructions

Read more
Alternate Builds Aquazone Aquazone Alternate Builds Hydronauts Small Builds 

6150 – Back A

February 23, 2023February 23, 2023 Master Builder 2819 Views

From: 6150: Crystal DetectorName: TBDSubmitted by: USERInstructions

Read more
ABCs Aquazone Aquazone Sets Hydronauts Official Sets Small Builds 

6150 (6159): Crystal Detector

February 23, 2023February 18, 2025 Master Builder 4912 Views

Year Released: 1998BricklinkInstructions *Alternate Build Connection: Aqua Rover (LEGO Mania Magazine: May-June 1998)

Read more

EXPLORE MORE OFFICIAL SETS

6876: Alienator
ABCs Bjarne Tveskov Blacktron Blacktron Sets Official Sets Small Builds Space 

6876: Alienator

November 16, 2019October 16, 2024 Master Builder

Year Released: 1988Designer: Bjarne TveskovBricklinkInstructions *Alternate Build Connection: 6882: Walking Astro Grappler, 6878: Sub Orbital Guardian

6829: Radon Rover
ABCs Official Sets Small Builds Space UFO UFO Sets 

6829: Radon Rover

August 4, 2020March 22, 2025 Master Builder
6903: Bug Blaster
Insectoids Insectoids Sets Official Sets Space Very Small Builds 

6903: Bug Blaster

October 4, 2024October 4, 2024 Master Builder
6361: Mobile Crane
Classic Town Construction Medium Builds Official Sets Town Town Sets 

6361: Mobile Crane

April 9, 2020April 9, 2020 Master Builder
6765: Gold City Junction
Jørn Thomsen Large Builds Official Sets Western Western Sets 

6765: Gold City Junction

November 10, 2019July 29, 2023 Master Builder
6706: Frontier Patrol
Cowboys Official Sets Very Small Builds Western Western Sets 

6706: Frontier Patrol

October 10, 2023October 10, 2023 Master Builder
8044: Universal Pneumatic Set
Medium Builds Official Sets Technic Technic Sets 

8044: Universal Pneumatic Set

August 23, 2024August 23, 2024 Master Builder
1593: Super Model
Classic Space Classic Space Sets Large Builds Official Sets Space Super Model 

1593: Super Model

February 3, 2021March 18, 2024 Master Builder
6211: Imperial Star Destroyer
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
4789: AT Aquatic Mech
Alpha Team Alpha Team Sets Medium Builds Mission Deep Sea Official Sets 

4789: AT Aquatic Mech

February 12, 2024February 21, 2024 Master Builder
6883: Terrestrial Rover
Classic Space Classic Space Sets Official Sets Small Builds Space 

6883: Terrestrial Rover

October 22, 2019October 21, 2024 Master Builder
1843-3: {Royal Knights Unknown}
Bonus/Value Pack Sets Castle Castle Sets Official Sets Royal Knights Small Builds 

1843-3: {Royal Knights Unknown}

September 8, 2023September 13, 2023 Master Builder
6038: Wolfpack Renegades
Castle Castle Sets Official Sets Small Builds Wolfpack 

6038: Wolfpack Renegades

October 14, 2021October 14, 2021 Master Builder
7111: Droid Fighter
Episode I Official Sets Small Builds Star Wars Star Wars Sets 

7111: Droid Fighter

July 14, 2021July 14, 2021 Master Builder
6250: Cross Bone Clipper
Medium Builds Official Sets Pirates Pirates I Pirates Sets 

6250: Cross Bone Clipper

February 20, 2025February 20, 2025 Master Builder
6483: Coastal Patrol
Classic Town Large Builds Official Sets Police Town Town Sets 

6483: Coastal Patrol

December 29, 2021December 29, 2021 Master Builder

BOXES

INSTRUCTIONS

FAVORITES

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.