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 2764 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 2735 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 5425 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 2580 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 2538 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 2567 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 4737 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 2570 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 2550 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 4620 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 2457 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 2214 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 2646 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 4688 Views

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

Read more

EXPLORE MORE OFFICIAL SETS

2963: Extreme Racer
Extreme Team Official Sets Small Builds Town Town Sets 

2963: Extreme Racer

January 30, 2024January 30, 2024 Master Builder

Year Released: 1998BricklinkInstructions

7310: Mono Jet
Life on Mars Life on Mars Sets Official Sets Very Small Builds 

7310: Mono Jet

April 16, 2021April 16, 2021 Master Builder
1843 – Side L
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
6716: Weapons Wagon
Cowboys Jørn Thomsen Official Sets Small Builds Western Western Sets 

6716: Weapons Wagon

April 2, 2022July 29, 2023 Master Builder
6546: Slick Racer
Official Sets Town Town Sets Very Small Builds 

6546: Slick Racer

May 23, 2022May 23, 2022 Master Builder
6655: Auto & Tire Repair
ABCs Classic Town Official Sets Small Builds Town Town Sets Traffic 

6655: Auto & Tire Repair

June 4, 2023July 31, 2023 Master Builder
7474: Urban Avenger vs. Raptor
Dino Attack Official Sets Small Builds 

7474: Urban Avenger vs. Raptor

April 27, 2023April 27, 2023 Master Builder
671: Shell Fuel Pumper
Classic Town Gas Station Official Sets Small Builds Town Town Sets 

671: Shell Fuel Pumper

October 20, 2019April 4, 2020 Master Builder
6086: Black Knight’s Castle
Black Knights Castle Castle Sets Extra Large Builds Niels Milan Pedersen Official Sets 

6086: Black Knight’s Castle

October 11, 2021July 29, 2023 Master Builder
6799: Showdown Canyon
Box Plus Cowboys Official Sets Playscape/Play Stage Box Small Builds Western Western Sets 

6799: Showdown Canyon

August 1, 2023October 8, 2024 Master Builder
6848: Strategic Pursuer
Bjarne Tveskov Duplicate Set Number Futron Sets Futuron Official Sets Small Builds Space 

6848: Strategic Pursuer

April 16, 2021March 11, 2024 Master Builder
6806: Surface Hopper
Classic Space Classic Space Sets Official Sets Space Very Small Builds 

6806: Surface Hopper

April 16, 2021April 16, 2021 Master Builder
6360: Weekend Cottage
Building Classic Town Medium Builds Official Sets Town Town Sets 

6360: Weekend Cottage

October 19, 2019April 4, 2020 Master Builder
7134: A-wing Fighter
Episode IV/V/VI Medium Builds Official Sets Star Wars Star Wars Sets 

7134: A-wing Fighter

December 29, 2021December 29, 2021 Master Builder
6354: Pursuit Squad
Classic Town Medium Builds Official Sets Police Town Town Sets 

6354: Pursuit Squad

February 9, 2022February 9, 2022 Master Builder
6493: Flying Time Vessel
Large Builds Official Sets Time Cruisers Time Cruisers Sets 

6493: Flying Time Vessel

July 14, 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.