How many pieces are in the HYDRO DYNAMICS Challenge Kit?

HYDRO DYNAMICS Challenge Kit contains 2,045 pieces.

When was the HYDRO DYNAMICS Challenge Kit released?

HYDRO DYNAMICS Challenge Kit was released in 2017.

🏛 FIRST LEGO League

Set #45804

HYDRO DYNAMICS Challenge Kit

The HYDRO DYNAMICS Challenge Kit is a fantastic educational tool disguised as a LEGO set.

Before you buy

Who it's for: Intermediate build Ideal for FIRST LEGO League teams, STEM educators, and LEGO Technic enthusiasts aged 10+
Build: 2,045 pieces · about 4.5 hours Build time is an estimate.
Price: $225.00 list price · 11.0¢ per piece
Availability: Likely retired

★★★★☆ 4.2 AI-generated review score, not a customer rating

Generally praised for its extensive parts selection and educational value, though some find the lack of specific instructions and focus on generic building limiting. A great resource for Technic enthusiasts but may not appeal to casual builders.

$225.00

Best Price

$202.50

You Save

10% OFF

📝 Our Take

AI-assisted editorial summary, grounded in our LEGO database and public community discussions. How we use AI

The HYDRO DYNAMICS Challenge Kit is a fantastic educational tool disguised as a LEGO set. Designed for FIRST LEGO League competitions, it provides a wealth of parts and building opportunities for young engineers and robotics enthusiasts.

This set is perfect for teams participating in the FIRST LEGO League or educators looking for hands-on STEM activities. The sheer volume of Technic pieces allows for complex model building and experimentation, promoting problem-solving and teamwork.

Skip this if you're looking for a traditional display model or casual building experience. This set's focus is on functionality and learning rather than aesthetics, so consider sets like the LEGO Technic sports cars if you prefer a display piece.

✨ New

Ask BlockTalk about this set

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Try asking:

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🧱 Building Experience

AI-assisted build estimate, grounded in our LEGO database and public community discussions. How we use AI

🧩

2,045

Pieces

⏱

4.5h

Estimated Build Time

📊

Intermediate

Difficulty

Build Highlights:

Extensive collection of Technic beams, pins, and connectors for complex mechanisms
Focus on building functional models and robotic attachments
Encourages experimentation and iterative design
Provides a platform for learning about engineering principles

📈 Investment Analysis

AI-assisted investment analysis, grounded in our LEGO database and public community discussions. How we use AI

→ Price stable

B-

Investment Grade

⏳ Retired

The HYDRO DYNAMICS Challenge Kit, while not a typical investment set, holds potential value for specific collectors. Its primary appeal lies in its large quantity of Technic parts, making it desirable for MOC builders and robotics enthusiasts. As a retired educational set, it's unlikely to see massive price appreciation, but the demand from FIRST LEGO League teams and the rarity of complete sets could drive moderate growth. The lack of licensing and minifigures limits its broader appeal, so manage expectations accordingly.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

⚖ Compare Similar Sets

The HYDRO DYNAMICS Challenge Kit is unique in its focus on educational applications and sheer quantity of Technic parts. While sets like the LEGO Technic sports cars offer more traditional building experiences, this kit provides unparalleled opportunities for experimentation and learning. Consider this set if you prioritize functionality and STEM education over display value.

1 Minifigure Included

White Torso, Classic Space Figure, White Legs, Black Hair

4 parts

Includes a single minifigure with a Classic Space torso, making it a nice addition for space fans, though not particularly rare.

📦 Parts Inventory

Official piece count: 2,045
Parts cataloged in this inventory: 233 unique parts, 2,048 pieces
Minifigures: 1

LEGO counts 2,045 pieces. This inventory comes from a separate parts catalog and lists 2,052, including the 4 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

Wheel 14mm D. x 9...

Part #: 11208 4× Light Bluish Gray

Tyre 21 x 9.9

Part #: 11209 4× Black

Brick Special 1 x...

Part #: 11211 4× White

Brick Special 1 x...

Part #: 11211 4× Light Bluish Gray

Plate Round 6 x 6...

Part #: 11213 5× Medium Azure

Plate Round 6 x 6...

Part #: 11213 1× White

Plate Round 6 x 6...

Part #: 11213 1× Light Bluish Gray

Plate Special 1 x...

Part #: 11458 2× Red

Brick Curved 2 x ...

Part #: 11477 1× Medium Azure

Plate Round 4 x 4...

Part #: 11833 13× Trans-Clear

Plate Round 4 x 4...

Part #: 11833 11× Bright Light Orange

Technic Panel Cur...

Part #: 11954 4× Black

Technic Panel Cur...

Part #: 11954 6× Medium Azure

Vehicle Base 4 x ...

Part #: 12622c01 1× Red

Plate Special 1 x...

Part #: 14704 1× Light Bluish Gray

Tile 2 x 2 Corner

Part #: 14719 1× Red

Technic Beam 3 x ...

Part #: 14720 2× Light Bluish Gray

Tile Round 2 x 2 ...

Part #: 14769 1× Light Bluish Gray

Tile Round 2 x 2 ...

Part #: 14769 13× Reddish Brown

Tile Round 2 x 2 ...

Part #: 14769 4× Yellow

Tile Round 2 x 2 ...

Part #: 14769 15× Medium Azure

Technic Pin Conne...

Part #: 15100 12× Light Bluish Gray

Brick Arch 1 x 6 ...

Part #: 15254 3× Dark Bluish Gray

Brick Arch 1 x 6 ...

Part #: 15254 2× Light Bluish Gray

Technic Panel 3 x...

Part #: 15458 7× Dark Bluish Gray

Technic Panel 3 x...

Part #: 15458 6× Green

Technic Axle 5 wi...

Part #: 15462 3× Reddish Brown

Brick Special 1 x...

Part #: 15533 2× Medium Nougat

Tile Special Roun...

Part #: 15535 4× Red

Tile Special Roun...

Part #: 15535 18× Light Bluish Gray

Plate Special 1 x...

Part #: 15573 2× Dark Bluish Gray

Brick Round 2 x 2...

Part #: 17485 3× Yellow

Technic Gear 20 T...

Part #: 18575 2× Tan

Technic Axle Pin ...

Part #: 18651 9× Black

Technic Pin Conne...

Part #: 18654 2× Light Bluish Gray

Plate Special 1 x...

Part #: 18677 10× Light Bluish Gray

Plate Round Corne...

Part #: 18980 21× Light Bluish Gray

Brick Special 1 x...

Part #: 22885 1× Light Bluish Gray

Plate Round Half ...

Part #: 22888 10× Dark Bluish Gray

Technic Pin Conne...

Part #: 22961 3× Light Bluish Gray

Tile Special 1 x ...

Part #: 2412b 10× White

Tile Special 1 x ...

Part #: 2412b 28× Light Bluish Gray

Tile Special 1 x ...

Part #: 2412b 1× Pearl Gold

Tile Special 1 x ...

Part #: 2412b 6× Dark Bluish Gray

Wedge Plate 3 x 6...

Part #: 2419 2× Dark Bluish Gray

Tile Round 1 x 1 ...

Part #: 24246 12× Light Bluish Gray

Tile 1 x 4 with G...

Part #: 2431 1× Red

Tile 1 x 4 with G...

Part #: 2431 4× White

Brick 1 x 2 x 5 w...

Part #: 2454b 2× Dark Bluish Gray

Brick 2 x 6

Part #: 2456 1× Dark Bluish Gray

Brick 1 x 16

Part #: 2465 4× Light Bluish Gray

Technic Driving R...

Part #: 26287 4× Red

Plate Round 2 x 2...

Part #: 2654 9× Trans-Light Blue

Plate Round 2 x 2...

Part #: 2654 4× Black

Plate Round 2 x 2...

Part #: 2654 1× Trans-Yellow

Plate Round 2 x 2...

Part #: 2654 1× White

Plate Round 2 x 2...

Part #: 2654 9× Light Bluish Gray

Technic Axle Towball

Part #: 2736 2× Light Bluish Gray

Technic Pin with ...

Part #: 2780 158× Black

Tile 2 x 2 Curved...

Part #: 27925 8× Light Bluish Gray

Brick 2 x 4

Part #: 3001 1× Medium Nougat

Brick 2 x 4

Part #: 3001 2× Dark Bluish Gray

Brick 2 x 4

Part #: 3001 1× Black

Part #: 3004 5× Bright Light Orange

Brick 1 x 2

Part #: 3004 4× Dark Bluish Gray

Brick 1 x 2

Part #: 3004 13× Medium Azure

Brick 1 x 2

Part #: 3004 28× White

Brick 1 x 1

Part #: 3005 11× Medium Azure

Brick 1 x 8

Part #: 3008 6× Dark Bluish Gray

Brick 1 x 8

Part #: 3008 3× Light Bluish Gray

Brick 1 x 6

Part #: 3009 10× Medium Azure

Brick 1 x 4

Part #: 3010 8× Dark Bluish Gray

Brick 1 x 4

Part #: 3010 2× Yellow

Brick 1 x 4

Part #: 3010 17× Medium Azure

Brick 1 x 4

Part #: 3010 5× Red

Brick 1 x 4

Part #: 3010 1× White

Plate 2 x 4

Part #: 3020 1× Black

Plate 2 x 4

Part #: 3020 2× Medium Azure

Plate 2 x 4

Part #: 3020 4× Light Bluish Gray

Plate 2 x 3

Part #: 3021 7× White

Plate 2 x 3

Part #: 3021 2× Tan

Plate 2 x 2

Part #: 3022 3× Light Bluish Gray

Plate 2 x 2

Part #: 3022 1× White

Plate 1 x 2

Part #: 3023 4× Black

Plate 1 x 2

Part #: 3023 7× White

Plate 1 x 2

Part #: 3023 3× Red

Plate 1 x 2

Part #: 3023 7× Light Bluish Gray

Brick Special 1 x...

Part #: 30237b 1× Red

Plate 1 x 1

Part #: 3024 4× Trans-Orange

Plate 6 x 12

Part #: 3028 1× Dark Bluish Gray

Plate 4 x 10

Part #: 3030 2× Dark Bluish Gray

Plate 4 x 10

Part #: 3030 2× Tan

Plate 4 x 10

Part #: 3030 6× White

Plate 4 x 6

Part #: 3032 1× Red

Plate 4 x 6

Part #: 3032 2× White

Plate 6 x 10

Part #: 3033 1× Light Bluish Gray

Plate 2 x 8

Part #: 3034 10× Light Bluish Gray

Plate 2 x 8

Part #: 3034 10× White

Plate 2 x 8

Part #: 3034 4× Dark Bluish Gray

Plate 6 x 8

Part #: 3036 1× Light Bluish Gray

Brick Round 2 x 2...

Part #: 30367c 1× Yellow

Brick Special 1 x...

Part #: 30414 1× Light Bluish Gray

Brick Special 1 x...

Part #: 30526 2× Dark Bluish Gray

Brick Special 1 x...

Part #: 30526 5× Light Bluish Gray

Panel 4 x 4 x 6 Q...

Part #: 30562 4× White

Plate Round Corne...

Part #: 30565 16× White

Brick Curved 2 x ...

Part #: 30602 2× Trans-Light Blue

Brick Round 1 x 1...

Part #: 3062b 3× Light Bluish Gray

Brick Round 1 x 1...

Part #: 3062b 4× White

Brick 1 x 2 witho...

Part #: 3065 4× Trans-Clear

Tile 2 x 2 with G...

Part #: 3068b 2× Light Bluish Gray

Tile 1 x 2 with G...

Part #: 3069b 4× Dark Bluish Gray

Tile 1 x 2 with G...

Part #: 3069b 1× White

Tile 1 x 2 with G...

Part #: 3069b 2× Red

Tile 1 x 2 with B...

Part #: 3069bpr0155 6× Yellow

Tile 1 x 1 with G...

Part #: 3070b 2× Light Bluish Gray

Tile 1 x 1 with G...

Part #: 3070b 1× Medium Azure

Plate Special 3 x...

Part #: 3176 4× Light Bluish Gray

Technic Brick 1 x...

Part #: 32000 1× Light Bluish Gray

Technic Brick 1 x...

Part #: 32000 2× White

Technic Brick 1 x...

Part #: 32000 4× Dark Bluish Gray

Technic Pin 3/4

Part #: 32002 4× Tan

Technic Link 1 x ...

Part #: 32005a 2× Dark Bluish Gray

Technic Axle and ...

Part #: 32013 2× Black

Technic Axle and ...

Part #: 32013 1× Light Bluish Gray

Technic Axle and ...

Part #: 32013 4× Yellow

Technic Axle and ...

Part #: 32014 4× Black

Technic Axle and ...

Part #: 32015 3× Light Bluish Gray

Technic Axle and ...

Part #: 32016 2× Medium Azure

Technic Axle and ...

Part #: 32016 1× Light Bluish Gray

Technic Axle and ...

Part #: 32034 8× Light Bluish Gray

Technic Axle Conn...

Part #: 32039 3× Yellow

Technic Axle Conn...

Part #: 32039 6× Light Bluish Gray

Technic Axle Conn...

Part #: 32039 4× Black

Technic Pin Long ...

Part #: 32054 10× Black

Technic Pin Long ...

Part #: 32054 6× Light Bluish Gray

Technic Axle 2 No...

Part #: 32062 11× Red

Technic Brick 1 x...

Part #: 32064a 4× Dark Bluish Gray

Technic Brick 1 x...

Part #: 32064a 2× Red

Technic Brick 1 x...

Part #: 32064a 1× Light Bluish Gray

Technic Knob Wheel

Part #: 32072 2× Black

Technic Axle 5

Part #: 32073 3× Light Bluish Gray

Technic Axle 5

Part #: 32073 6× Yellow

Technic Bush 1/2 ...

Part #: 32123b 9× Yellow

Technic Bush 1/2 ...

Part #: 32123b 8× Light Bluish Gray

Technic Beam 2 x ...

Part #: 32140 16× Dark Bluish Gray

Technic Beam 2 x ...

Part #: 32140 7× Yellow

Technic Beam 2 x ...

Part #: 32140 1× Light Bluish Gray

Technic Axle and ...

Part #: 32184 4× Black

Technic Axle and ...

Part #: 32192 2× Black

Technic Beam 3 x ...

Part #: 32250 8× Dark Bluish Gray

Technic Gear 12 T...

Part #: 32270 3× Black

Technic Beam 1 x ...

Part #: 32271 1× Light Bluish Gray

Technic Beam 1 x ...

Part #: 32278 6× Light Bluish Gray

Technic Beam 1 x ...

Part #: 32278 4× Dark Bluish Gray

Technic Beam 1 x ...

Part #: 32316 5× White

Technic Beam 1 x ...

Part #: 32316 10× Dark Bluish Gray

Technic Beam 1 x ...

Part #: 32316 3× Light Bluish Gray

Technic Beam 1 x ...

Part #: 32348 2× Dark Bluish Gray

Brick 1 x 2 x 2 w...

Part #: 3245c 4× Dark Bluish Gray

Brick 1 x 2 x 2 w...

Part #: 3245c 5× White

Technic Gear 36 T...

Part #: 32498 1× Black

Technic Beam 1 x ...

Part #: 32523 2× White

Technic Beam 1 x ...

Part #: 32523 4× Light Bluish Gray

Technic Beam 1 x ...

Part #: 32523 10× Dark Bluish Gray

Technic Beam 1 x ...

Part #: 32523 3× Yellow

Technic Beam 1 x ...

Part #: 32523 4× Blue

Technic Beam 1 x ...

Part #: 32524 4× Light Bluish Gray

Technic Beam 1 x ...

Part #: 32524 4× White

Technic Beam 1 x ...

Part #: 32524 2× Blue

Technic Beam 1 x ...

Part #: 32524 2× Yellow

Technic Beam 1 x ...

Part #: 32525 14× White

Technic Beam 1 x ...

Part #: 32525 12× Dark Bluish Gray

Technic Beam 1 x ...

Part #: 32525 2× Black

Technic Beam 1 x ...

Part #: 32525 1× Light Bluish Gray

Technic Beam 3 x ...

Part #: 32526 2× White

Technic Pin Conne...

Part #: 32529 4× Black

Technic Pin Conne...

Part #: 32530 2× Dark Bluish Gray

Technic Pin Long ...

Part #: 32556 3× Tan

Technic Pin Conne...

Part #: 32557 4× Light Bluish Gray

Technic Beam 3 x ...

Part #: 33299b 4× Light Bluish Gray

Animal, Frog

Part #: 33320 1× Pearl Gold

Plate 1 x 8

Part #: 3460 7× Light Bluish Gray

Plate 1 x 8

Part #: 3460 6× Dark Bluish Gray

Plate 1 x 3

Part #: 3623 22× Light Bluish Gray

Plate 1 x 3

Part #: 3623 20× Dark Bluish Gray

Technic Gear 40 T...

Part #: 3649 1× Light Bluish Gray

Brick Arch 1 x 4

Part #: 3659 6× Light Bluish Gray

Brick Sloped Inve...

Part #: 3660 1× Light Bluish Gray

Brick Sloped Inve...

Part #: 3660 1× White

Plate 1 x 6

Part #: 3666 2× Red

Plate 1 x 6

Part #: 3666 4× Dark Bluish Gray

Technic Pin witho...

Part #: 3673 24× Light Bluish Gray

Brick Sloped 65° ...

Part #: 3678b 4× Dark Bluish Gray

Technic Brick 1 x...

Part #: 3700 2× Light Bluish Gray

Technic Brick 1 x...

Part #: 3700 8× Dark Bluish Gray

Technic Brick 1 x...

Part #: 3701 4× Dark Bluish Gray

Technic Brick 1 x...

Part #: 3702 2× Light Bluish Gray

Technic Axle 4

Part #: 3705 5× Black

Part #: 3706 3× Black

Technic Axle 8

Part #: 3707 3× Black

Technic Axle 12

Part #: 3708 10× Black

Technic Axle 12

Part #: 3708 2× Red

Technic Plate 2 x...

Part #: 3709 7× White

Plate 1 x 4

Part #: 3710 2× Light Bluish Gray

Plate 1 x 4

Part #: 3710 15× White

Plate 1 x 4

Part #: 3710 7× Red

Plate 1 x 4

Part #: 3710 10× Dark Bluish Gray

Technic Bush

Part #: 3713 11× Light Bluish Gray

Technic Plate 2 x...

Part #: 3738 2× Light Bluish Gray

Technic Gear Rack...

Part #: 3743 2× Light Bluish Gray

Brick Sloped Inve...

Part #: 3747b 1× Dark Bluish Gray

Technic Axle Pin ...

Part #: 3749 10× Tan

Plate 2 x 6

Part #: 3795 1× Dark Bluish Gray

Plate 2 x 6

Part #: 3795 2× White

Plate 2 x 6

Part #: 3795 5× Light Bluish Gray

Plate 2 x 10

Part #: 3832 5× Light Bluish Gray

Plate 2 x 10

Part #: 3832 1× White

Weapon Axe

Part #: 3835 1× Black

Technic Brick 1 x...

Part #: 3894 2× Yellow

Technic Brick 1 x...

Part #: 3894 4× Dark Bluish Gray

Brick Round 2 x 2...

Part #: 3941 4× Light Bluish Gray

Brick Round 2 x 2...

Part #: 3941 13× Trans-Clear

Brick Round 2 x 2...

Part #: 3941 5× Yellow

Cone 2 x 2 x 2, O...

Part #: 3942c 1× Yellow

Dish 4 x 4 Invert...

Part #: 3960 1× White

Dish 4 x 4 Invert...

Part #: 3960 2× Trans-Light Blue

Plate Round 2 x 2...

Part #: 4032a 5× Black

Plate Round 2 x 2...

Part #: 4032a 1× Medium Azure

Plate Round 2 x 2...

Part #: 4032a 4× Yellow

Plate Round 2 x 2...

Part #: 4032a 11× White

Plate Round 2 x 2...

Part #: 4032a 13× Light Bluish Gray

Technic Beam 1 x ...

Part #: 40490 4× Blue

Technic Beam 1 x ...

Part #: 40490 12× Dark Bluish Gray

Technic Beam 1 x ...

Part #: 40490 4× Light Bluish Gray

Plate Special 1 x...

Part #: 4081b 1× White

Plate 8 x 8

Part #: 41539 1× Dark Bluish Gray

Tile 1 x 8 with G...

Part #: 4162 4× Medium Azure

Tile 1 x 8 with G...

Part #: 4162 5× Light Bluish Gray

Technic Beam 1 x ...

Part #: 41677 5× Dark Bluish Gray

Technic Axle and ...

Part #: 41678 2× Dark Bluish Gray

Technic Axle and ...

Part #: 42003 2× Dark Bluish Gray

String Reel 2 x 4...

Part #: 4208 1× Black

String Reel 2 x 4...

Part #: 4209b 1× Red

Technic Pin 1/2 w...

Part #: 4274 17× Blue

Plate 2 x 16

Part #: 4282 1× Dark Bluish Gray

Dish 6 x 6 Invert...

Part #: 4285b 1× Trans-Light Blue

Brick Sloped 33° ...

Part #: 4286 3× Dark Bluish Gray

Technic Axle Pin ...

Part #: 43093 15× Blue

Box 2 x 2 x 2 [Ho...

Part #: 4345b 1× Red

Box 2 x 2 x 2 Doo...

Part #: 4346 1× Light Bluish Gray

Equipment Camera ...

Part #: 4360 1× Black

Technic Beam 1 x ...

Part #: 43857 11× Light Bluish Gray

Technic Axle 7

Part #: 44294 1× Yellow

Technic Axle 7

Part #: 44294 13× Light Bluish Gray

Bracket 1 x 2 - 2...

Part #: 44728 2× Yellow

Bracket 1 x 2 - 2...

Part #: 44728 2× Light Bluish Gray

Bracket 1 x 2 - 2...

Part #: 44728 2× White

Bracket 1 x 2 - 2...

Part #: 44728 2× Red

Plate 1 x 10

Part #: 4477 9× White

Plate Special 1 x...

Part #: 4510 1× Light Bluish Gray

Technic Axle 3

Part #: 4519 5× Yellow

Technic Axle 3

Part #: 4519 8× Light Bluish Gray

Brick Wedged, Cur...

Part #: 45677 1× Red

Brick Wedged, Cur...

Part #: 45677pr0007 4× White

Windscreen 2 x 4 ...

Part #: 4594 1× Trans-Clear

Bar 1 x 3 [Clip /...

Part #: 4735 1× Black

Brick Round Corne...

Part #: 48092 22× Medium Azure

Brick Round Corne...

Part #: 48092 8× Medium Nougat

Brick Round Corne...

Part #: 48092 24× Light Bluish Gray

Plate Special 1 x...

Part #: 48336 9× Light Bluish Gray

Technic Pin Conne...

Part #: 48989 2× Light Bluish Gray

Brick Curved 3 x ...

Part #: 50950 2× Bright Green

Brick Sloped 30° ...

Part #: 54200 1× Trans-Dark Blue

Brick Sloped 30° ...

Part #: 54200 1× Trans-Red

Technic Axle 8 wi...

Part #: 55013 3× Dark Bluish Gray

Technic Tread Spr...

Part #: 57520 2× Black

Technic Axle Conn...

Part #: 57585 2× Light Bluish Gray

Panel 1 x 6 x 5

Part #: 59349 1× Dark Bluish Gray

Panel 1 x 6 x 5

Part #: 59349 1× White

Technic Axle 5.5 ...

Part #: 59426 3× Dark Bluish Gray

Technic Axle Conn...

Part #: 59443 4× Light Bluish Gray

Technic Axle Conn...

Part #: 59443 12× Dark Bluish Gray

Technic Axle Conn...

Part #: 59443 1× Yellow

Technic Axle Conn...

Part #: 59443 9× Reddish Brown

Technic Axle Conn...

Part #: 59443 1× Black

Cone 1 x 1 [Top G...

Part #: 59900 3× Yellow

Brick Arch 1 x 3 ...

Part #: 6005 4× Light Bluish Gray

Plate Round 4 x 4...

Part #: 60474 4× Light Bluish Gray

Plate Round 4 x 4...

Part #: 60474 1× Bright Light Orange

Plate Round 4 x 4...

Part #: 60474 1× White

Plate 1 x 12

Part #: 60479 8× Light Bluish Gray

Brick Sloped 65° ...

Part #: 60481 4× Dark Bluish Gray

Technic Beam 1 x ...

Part #: 60483 2× Black

Technic Beam 3 x ...

Part #: 60484 1× Light Bluish Gray

Technic Axle 9

Part #: 60485 1× Yellow

Technic Axle 9

Part #: 60485 6× Light Bluish Gray

Door Frame 1 x 4 ...

Part #: 60596 1× Black

Door 1 x 4 x 6 wi...

Part #: 60623 1× White

Brick Curved 2 x ...

Part #: 6081 1× Light Bluish Gray

Brick Curved 2 x ...

Part #: 6081 1× Red

Equipment Hose No...

Part #: 60849 1× Light Bluish Gray

Brick 1 x 12

Part #: 6112 6× Light Bluish Gray

Plate Round 1 x 1...

Part #: 6141 6× White

Plate Round 1 x 1...

Part #: 6141 6× Light Bluish Gray

Plate Round 1 x 1...

Part #: 6141 4× Pearl Gold

Plate Round 1 x 1...

Part #: 6141 3× Medium Azure

Plate Round 1 x 1...

Part #: 6141 2× Red

Plate Round 1 x 1...

Part #: 6141 4× Black

Brick Arch 1 x 6 ...

Part #: 6183 2× White

Brick Arch 1 x 6 ...

Part #: 6183 3× Light Bluish Gray

Technic Universal...

Part #: 61903 6× Light Bluish Gray

Brick Round 4 x 4...

Part #: 6222 2× Light Bluish Gray

Windscreen 3 x 6 ...

Part #: 62360 2× Trans-Light Blue

Technic Pin Conne...

Part #: 62462 1× Pearl Gold

Technic Pin Conne...

Part #: 62462 10× Yellow

Technic Pin Conne...

Part #: 62462 7× Light Bluish Gray

Technic Pin Conne...

Part #: 62462 1× Bright Green

Technic Panel Cur...

Part #: 62531 4× Yellow

Cylinder Half 2 x...

Part #: 6259 10× Trans-Light Blue

Tile 1 x 3

Part #: 63864 1× Red

Tile 1 x 3

Part #: 63864 5× Yellow

Technic Axle and ...

Part #: 63869 1× Light Bluish Gray

Technic Beam 5 x ...

Part #: 64178 2× Light Bluish Gray

Technic Beam Fram...

Part #: 64179 5× Light Bluish Gray

Technic Panel 5 x...

Part #: 64782 6× Green

Technic Panel 5 x...

Part #: 64782 2× Light Bluish Gray

Technic Axle and ...

Part #: 6536 2× White

Technic Axle and ...

Part #: 6536 3× Light Bluish Gray

Technic Axle and ...

Part #: 6536 2× Yellow

Technic Brick 1 x...

Part #: 6541 7× Light Bluish Gray

Technic Axle 1.5 ...

Part #: 6553 2× Dark Bluish Gray

Technic Pin Long ...

Part #: 6558 104× Blue

Technic Gear 12 T...

Part #: 6589 2× Tan

Technic Pin with ...

Part #: 6628 5× Black

Tile 1 x 6 with G...

Part #: 6636 11× Light Bluish Gray

Hinge Plate 1 x 4...

Part #: 73983 2× Yellow

Hose, Ribbed 7mm ...

Part #: 78c18 2× Flat Silver

Brick Round Corne...

Part #: 85080 48× White

Brick Round Corne...

Part #: 85080 24× Yellow

Wave / Flame Roun...

Part #: 85959pat0003 2× Trans-Red

Brick Sloped 30° ...

Part #: 85984 18× Light Bluish Gray

Brick Sloped 30° ...

Part #: 85984 1× Red

Tile 2 x 4 with G...

Part #: 87079 5× Dark Bluish Gray

Tile 2 x 4 with G...

Part #: 87079 1× White

Tile 2 x 4 with G...

Part #: 87079 3× Red

Technic Panel Fai...

Part #: 87080 4× Dark Purple

Brick Round 4 x 4...

Part #: 87081 1× Reddish Brown

Brick Round 4 x 4...

Part #: 87081 6× Red

Plate Special 2 x...

Part #: 87580 3× White

Plate Special 2 x...

Part #: 87580 1× Light Bluish Gray

Brick Wedged 2 x ...

Part #: 87620 4× Light Bluish Gray

Technic Gear Rack...

Part #: 87761 2× Black

Technic Link Trea...

Part #: 88323 2× Dark Bluish Gray

Technic Link Trea...

Part #: 88323 12× Medium Nougat

Plate 8 x 16

Part #: 92438 2× Dark Bluish Gray

Brick Arch 1 x 6 ...

Part #: 92950 2× Light Bluish Gray

Brick Curved 4 x ...

Part #: 93273 8× Light Bluish Gray

Bracket 1 x 2 - 2...

Part #: 93274 6× Light Bluish Gray

Technic Gear 16 T...

Part #: 94925 2× Light Bluish Gray

Brick and Axle Se...

Part #: 96874 1× Orange

Tile Round 1 x 1

Part #: 98138 2× Trans-Red

Tile Round 1 x 1

Part #: 98138 2× Trans-Clear

Brick Special 1 x...

Part #: 98283 4× Dark Bluish Gray

Large Figure Weap...

Part #: 98585 3× Light Bluish Gray

Technic Axle 4 wi...

Part #: 99008 7× Tan

Bracket 1 x 2 - 2...

Part #: 99207 2× Black

Bracket 1 x 2 - 2...

Part #: 99207 2× Light Bluish Gray

The set is a treasure trove of Technic elements, with a large quantity of pins and connectors in various colors. The abundance of Light Bluish Gray and Black pieces makes it a useful source for MOC builders focused on Technic models.

🛒 Where to Buy

eBay

✓ In Stock

$202.50 →

Walmart

✓ In Stock

Compare on eBay →

$213.75

Target

✓ In Stock

Compare on eBay →

$225.00

💎 Notable Parts

Black Technic Pin with Friction Ridges Lengthwise and Center Slots (158x) $7.90

Blue Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots (104x) $5.20

White Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] (48x) $4.80

Light Bluish Gray Brick Round Corner 4 x 4 Macaroni Wide with 3 Studs (24x) $3.60

Medium Azure Brick Round Corner 4 x 4 Macaroni Wide with 3 Studs (22x) $3.30

Est. BrickLink Part Value

$24.80

💡 MOC Potential

🤖 Advanced robotics platforms with complex articulation

🚗 Large-scale Technic vehicles with intricate mechanisms

🏙 Expanding LEGO City with functional bridges and automated systems

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

Based on 8 videos

3.0 /5

Mixed

0% positive

BlockTalk AI

Analysis of YouTube videos related to the HYDRO DYNAMICS Challenge Kit (45804-1) indicates a neutral sentiment overall. Videos primarily focus on demonstrating robot builds and explaining challenge tasks, offering practical insights rather than subjective opinions on the set itself.

Mod Corner - Hocus Pocus Doom

GmanLives • 146.9K views Review

Hydro Dynamics - EPIC Time-lapse | Max Point Mission, Building The Robot

Legos R Us • 20.1K views Review

FIRST LEGO League Challenge - 2019/20 - CITY SHAPER - Challenge Aufgaben

HANDS on TECHNOLOGY • 5.4K views Review

Community Sentiment

Based on 8 YouTube reviews

Not enough Reddit data

YouTube

3.0 /5

Mixed

0% positive

Positive

Mixed

Critical

BlockTalk AI Analysis

What the Community Says

5 YouTube reviews

BlockTalk AI Summary

Legos R Us showcases a robot build designed for the challenge, while HANDS on TECHNOLOGY provides an overview of the season's expectations within the FIRST LEGO League program. LEGORobotics Mr. Hino dissects the RePlay Robot Game, offering a detailed look at the game's components and mechanics.