# LEGO 45804-1 — HYDRO DYNAMICS Challenge Kit (2017)

Source: https://www.brickmissing.com/sets/45804-1-hydro-dynamics-challenge-kit
Publisher: BrickMissing (https://www.brickmissing.com) — free LEGO parts checker. Not affiliated with the LEGO Group.

## Set facts

- Set number: 45804-1
- Name: HYDRO DYNAMICS Challenge Kit
- Theme: FIRST LEGO League › FIRST LEGO League Challenge
- Released: 2017
- Pieces: 2052
- Distinct part + colour lots: 372
- Build difficulty: advanced
- Repairability: 0.8% of this set's lots are hard to replace (3 of 372 part+colour combinations appear in three or fewer sets in the entire LEGO catalog).

## Complete parts list (372 lots, 2052 pieces)

Prices are the official LEGO Pick a Brick price per individual part, where LEGO publishes one.

| Qty | Part | Colour | Part no. | LEGO element ID | LEGO price each |
| ---: | --- | --- | --- | --- | --- |
| 4 | Wheel 14mm D. x 9.9mm with Centre Groove, Fake Bolts and 6 Spokes | Light Bluish Gray | 11208 | 6029209 | €0,16 |
| 4 | Tyre 21 x 9.9 | Black | 11209 | 6029208 | €0,42 |
| 4 | Brick Special 1 x 2 with 2 Studs on 1 Side | Light Bluish Gray | 11211 | 6015344 | €0,13 |
| 4 | Brick Special 1 x 2 with 2 Studs on 1 Side | White | 11211 | 6058177 | €0,13 |
| 5 | Plate Round 6 x 6 with Hole | Medium Azure | 11213 | 6029690 | €0,41 |
| 1 | Plate Round 6 x 6 with Hole | White | 11213 | 6109817 | €0,41 |
| 1 | Plate Round 6 x 6 with Hole | Light Bluish Gray | 11213 | 6015349 | €0,41 |
| 2 | Plate Special 1 x 2 with Pin Hole on Top | Red | 11458 | 6099736 | €0,10 |
| 1 | Slope Curved 2 x 1 No Studs [1/2 Bow] | Medium Azure | 11477 | 6071246 | €0,06 |
| 13 | Plate Round 4 x 4 with 2 x 2 Round Opening | Trans-Clear | 11833 | 6507890 | €0,36 |
| 11 | Plate Round 4 x 4 with 2 x 2 Round Opening | Bright Light Orange | 11833 | 6097037 | — |
| 6 | Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel Surface | Medium Azure | 11954 | 6133928 | — |
| 4 | Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel Surface | Black | 11954 | 6031916 | €1,00 |
| 1 | Vehicle Base 4 x 10 x 2 1/2 with Mudguards, Wheel Pins and 6 x 2 Centre Recess with 3 Holes, Red Wheel Holders | Red | 12622c01 | 6020101 | — |
| 1 | Plate Special 1 x 2 5.9mm Centre Side Towball Socket | Light Bluish Gray | 14704 | 6043656 | €0,13 |
| 1 | Tile 2 x 2 Corner | Red | 14719 | 6078641 | €0,06 |
| 2 | Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] | Light Bluish Gray | 14720 | 6055519 | €0,36 |
| 15 | Tile Round 2 x 2 with Bottom Stud Holder | Medium Azure | 14769 | 6145255 | €0,07 |
| 4 | Tile Round 2 x 2 with Bottom Stud Holder | Yellow | 14769 | 6078279 | €0,07 |
| 13 | Tile Round 2 x 2 with Bottom Stud Holder | Reddish Brown | 14769 | 6075213 | €0,07 |
| 1 | Tile Round 2 x 2 with Bottom Stud Holder | Light Bluish Gray | 14769 | 6052200 | €0,07 |
| 12 | Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise | Light Bluish Gray | 15100 | 6172538 | — |
| 3 | Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version] | Dark Bluish Gray | 15254 | 6106191 | €0,27 |
| 2 | Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version] | Light Bluish Gray | 15254 | 6106189 | €0,27 |
| 7 | Technic Panel 3 x 11 x 1 | Dark Bluish Gray | 15458 | 6127205 | €1,13 |
| 6 | Technic Panel 3 x 11 x 1 | Light Bluish Gray | 15458 | 6139301 | — |
| 3 | Technic Axle 5 with Stop | Reddish Brown | 15462 | 6159763 | €0,11 |
| 2 | Brick Special 1 x 4 with Masonry Brick Profile | Medium Nougat | 15533 | 6055309 | €0,23 |
| 4 | Tile Round 2 x 2 with Hole | Red | 15535 | 6102138 | €0,07 |
| 18 | Tile Round 2 x 2 with Hole | Light Bluish Gray | 15535 | 6179186 | €0,07 |
| 2 | Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) | Dark Bluish Gray | 15573 | 6092572 | €0,06 |
| 3 | Brick Round 2 x 2, Pin Holes | Yellow | 17485 | 6378132 | €0,24 |
| 2 | Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] | Tan | 18575 | 6346517 | €0,36 |
| 9 | Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle | Black | 18651 | 6089119 | €0,08 |
| 2 | Technic Pin Connector Round 1L [Beam] | Light Bluish Gray | 18654 | 6183784 | €0,05 |
| 10 | Plate Special 1 x 2 with Pin Hole Underneath | Light Bluish Gray | 18677 | 6168633 | €0,07 |
| 21 | Plate Round Corners 2 x 6 Double | Light Bluish Gray | 18980 | 6105964 | €0,18 |
| 1 | Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side | Light Bluish Gray | 22885 | 6123809 | €0,17 |
| 10 | Plate Round Half 4 x 8 | Dark Bluish Gray | 22888 | 6141856 | €0,36 |
| 3 | Technic Pin Connector Hub with 1 Axle | Light Bluish Gray | 22961 | 6123815 | €0,13 |
| 6 | Tile Special 1 x 2 Grille with Bottom Groove | Dark Bluish Gray | 2412b | 4210631 | €0,06 |
| 1 | Tile Special 1 x 2 Grille with Bottom Groove | Pearl Gold | 2412b | 4490599 | €0,06 |
| 10 | Tile Special 1 x 2 Grille with Bottom Groove | White | 2412b | 241201 | €0,06 |
| 28 | Tile Special 1 x 2 Grille with Bottom Groove | Light Bluish Gray | 2412b | 4211350 | €0,06 |
| 2 | Wedge Plate 3 x 6 Cut Corners | Dark Bluish Gray | 2419 | 4210984 | €0,29 |
| 12 | Tile Round 1 x 1 Half Circle | Light Bluish Gray | 24246 | 6250597 | €0,06 |
| 1 | Tile 1 x 4 with Groove | Red | 2431 | 243121 | €0,12 |
| 4 | Tile 1 x 4 with Groove | White | 2431 | 243101 | €0,12 |
| 2 | Brick 1 x 2 x 5 with Hollow Studs | Dark Bluish Gray | 2454b | 4211075 | €0,31 |
| 1 | Brick 2 x 6 | Dark Bluish Gray | 2456 | 4210875 | €0,29 |
| 4 | Brick 1 x 16 | Light Bluish Gray | 2465 | 4211366 | €0,63 |
| 4 | Technic Driving Ring Connector Smooth [4 rounded side walls] | Red | 26287 | 6153686 | — |
| 1 | Plate Round 2 x 2 with Rounded Bottom [Boat Stud] | White | 2654 | 4278271 | €0,07 |
| 4 | Plate Round 2 x 2 with Rounded Bottom [Boat Stud] | Black | 2654 | 4278359 | €0,07 |
| 1 | Plate Round 2 x 2 with Rounded Bottom [Boat Stud] | Trans-Yellow | 2654 | 6171728 | €0,12 |
| 9 | Plate Round 2 x 2 with Rounded Bottom [Boat Stud] | Light Bluish Gray | 2654 | 4278273 | €0,07 |
| 9 | Plate Round 2 x 2 with Rounded Bottom [Boat Stud] | Trans-Light Blue | 2654 | 6171733 | €0,12 |
| 2 | Technic Axle Towball | Light Bluish Gray | 2736 | 4211375 | €0,13 |
| 158 | Technic Pin with Friction Ridges Lengthwise and Center Slots | Black | 2780 | 278026 | — |
| 8 | Tile 2 x 2 Curved, Macaroni | Light Bluish Gray | 27925 | 6163990 | €0,08 |
| 1 | Brick 2 x 4 | Medium Nougat | 3001 | 6135191 | €0,22 |
| 1 | Brick 2 x 4 | Black | 3001 | 300126 | €0,22 |
| 2 | Brick 2 x 4 | Dark Bluish Gray | 3001 | 4211085 | €0,22 |
| 3 | Brick 2 x 2 | Red | 3003 | 300321 | €0,13 |
| 28 | Brick 1 x 2 | White | 3004 | 300401 | €0,11 |
| 4 | Brick 1 x 2 | Dark Bluish Gray | 3004 | 4211088 | €0,11 |
| 2 | Brick 1 x 2 | Red | 3004 | 300421 | €0,11 |
| 13 | Brick 1 x 2 | Medium Azure | 3004 | 6092674 | €0,11 |
| 5 | Brick 1 x 2 | Bright Light Orange | 3004 | 6003003 | €0,11 |
| 11 | Brick 1 x 1 | Medium Azure | 3005 | 4619652 | €0,07 |
| 6 | Brick 1 x 8 | Dark Bluish Gray | 3008 | 4211099 | €0,24 |
| 3 | Brick 1 x 8 | Light Bluish Gray | 3008 | 4211392 | €0,24 |
| 10 | Brick 1 x 6 | Medium Azure | 3009 | 4619653 | €0,25 |
| 8 | Brick 1 x 4 | Dark Bluish Gray | 3010 | 4211103 | €0,16 |
| 1 | Brick 1 x 4 | White | 3010 | 301001 | €0,16 |
| 2 | Brick 1 x 4 | Yellow | 3010 | 301024 | €0,16 |
| 5 | Brick 1 x 4 | Red | 3010 | 301021 | €0,16 |
| 17 | Brick 1 x 4 | Medium Azure | 3010 | 6036238 | €0,16 |
| 4 | Plate 2 x 4 | Light Bluish Gray | 3020 | 4211395 | €0,15 |
| 1 | Plate 2 x 4 | Black | 3020 | 302026 | €0,15 |
| 2 | Plate 2 x 4 | Medium Azure | 3020 | 4655256 | €0,15 |
| 7 | Plate 2 x 3 | White | 3021 | 302101 | €0,13 |
| 2 | Plate 2 x 3 | Tan | 3021 | 4118790 | €0,13 |
| 1 | Plate 2 x 2 | White | 3022 | 302201 | €0,10 |
| 3 | Plate 2 x 2 | Light Bluish Gray | 3022 | 4211397 | €0,10 |
| 7 | Plate 1 x 2 | White | 3023 | 302301 | €0,08 |
| 7 | Plate 1 x 2 | Light Bluish Gray | 3023 | 4211398 | €0,08 |
| 3 | Plate 1 x 2 | Red | 3023 | 302321 | €0,08 |
| 4 | Plate 1 x 2 | Black | 3023 | 302326 | €0,08 |
| 1 | Brick Special 1 x 2 with Vertical Clip [Open O Clip] | Red | 30237b | 6330198 | €0,23 |
| 4 | Plate 1 x 1 | Trans-Orange | 3024 | 6513961 | €0,06 |
| 1 | Plate 6 x 12 | Dark Bluish Gray | 3028 | 4256149 | €1,63 |
| 2 | Plate 4 x 10 | Tan | 3030 | 6037834 | €0,56 |
| 2 | Plate 4 x 10 | Dark Bluish Gray | 3030 | 4211122 | €0,56 |
| 6 | Plate 4 x 10 | White | 3030 | 4503008 | €0,56 |
| 1 | Plate 4 x 6 | Red | 3032 | 303221 | €0,41 |
| 2 | Plate 4 x 6 | White | 3032 | 303201 | €0,41 |
| 1 | Plate 6 x 10 | Light Bluish Gray | 3033 | 4211405 | €0,71 |
| 10 | Plate 2 x 8 | Light Bluish Gray | 3034 | 4211406 | €0,29 |
| 4 | Plate 2 x 8 | Dark Bluish Gray | 3034 | 4210997 | €0,29 |
| 10 | Plate 2 x 8 | White | 3034 | 303401 | €0,29 |
| 1 | Plate 6 x 8 | Light Bluish Gray | 3036 | 4211408 | €0,71 |
| 1 | Brick Round 2 x 2 Dome Top, Hollow Stud | Yellow | 30367c | 4216656 | — |
| 1 | Brick Special 1 x 4 with 4 Studs on One Side | Light Bluish Gray | 30414 | 4211636 | €0,18 |
| 5 | Brick Special 1 x 2 with 2 Pins, Round Pin Holes | Light Bluish Gray | 30526 | 4211660 | — |
| 2 | Brick Special 1 x 2 with 2 Pins, Round Pin Holes | Dark Bluish Gray | 30526 | 4210697 | — |
| 4 | Panel 4 x 4 x 6 Quarter Cylinder | White | 30562 | 4142926 | — |
| 16 | Plate Round Corner 4 x 4 | White | 30565 | 4178429 | €0,18 |
| 2 | Slope Curved 2 x 2 with Lip, No Studs | Trans-Light Blue | 30602 | 4630743 | — |
| 4 | Brick Round 1 x 1 Open Stud | White | 3062b | 306201 | €0,06 |
| 3 | Brick Round 1 x 1 Open Stud | Light Bluish Gray | 3062b | 4211412 | €0,06 |
| 4 | Brick 1 x 2 without Bottom Tube | Trans-Clear | 3065 | 6514262 | €0,12 |
| 2 | Tile 2 x 2 with Groove | Light Bluish Gray | 3068b | 4211413 | €0,07 |
| 1 | Tile 1 x 2 with Groove | White | 3069b | 306901 | €0,07 |
| 2 | Tile 1 x 2 with Groove | Red | 3069b | 306921 | €0,07 |
| 4 | Tile 1 x 2 with Groove | Dark Bluish Gray | 3069b | 4211052 | €0,07 |
| 6 | Tile 1 x 2 with Black Diagonal Stripes, Large Yellow Corner Triangles Print | Yellow | 3069bpr0155 | 6129504 | — |
| 2 | Tile 1 x 1 with Groove | Light Bluish Gray | 3070b | 4211415 | €0,05 |
| 1 | Tile 1 x 1 with Groove | Medium Azure | 3070b | 4655243 | €0,05 |
| 4 | Plate Special 3 x 2 with Rounded End, Hole | Light Bluish Gray | 3176 | 4211419 | €0,12 |
| 4 | Technic Brick 1 x 2 [2 Pin Holes] | Dark Bluish Gray | 32000 | 4210762 | €0,10 |
| 1 | Technic Brick 1 x 2 [2 Pin Holes] | Light Bluish Gray | 32000 | 4211541 | €0,10 |
| 2 | Technic Brick 1 x 2 [2 Pin Holes] | White | 32000 | 3200001 | €0,10 |
| 4 | Technic Pin 3/4 | Tan | 32002 | 6013938 | €0,08 |
| 2 | Technic Link 1 x 6 without Stoppers | Dark Bluish Gray | 32005a | 4629920 | €0,22 |
| 1 | Technic Axle and Pin Connector Angled #1 | Light Bluish Gray | 32013 | 6296859 | €0,08 |
| 2 | Technic Axle and Pin Connector Angled #1 | Black | 32013 | 6284699 | €0,08 |
| 4 | Technic Axle and Pin Connector Angled #1 | Yellow | 32013 | 6329889 | €0,08 |
| 4 | Technic Axle and Pin Connector Angled #6 - 90° | Black | 32014 | 6268905 | €0,22 |
| 3 | Technic Axle and Pin Connector Angled #5 - 112.5° | Light Bluish Gray | 32015 | 6271347 | €0,21 |
| 2 | Technic Axle and Pin Connector Angled #3 - 157.5? | Medium Azure | 32016 | 6261392 | €0,13 |
| 1 | Technic Axle and Pin Connector Angled #3 - 157.5? | Light Bluish Gray | 32016 | 6261387 | €0,13 |
| 8 | Technic Axle and Pin Connector Angled #2 - 180° | Light Bluish Gray | 32034 | 6346487 | €0,11 |
| 6 | Technic Axle Connector with Axle Hole | Light Bluish Gray | 32039 | 4211553 | — |
| 3 | Technic Axle Connector with Axle Hole | Yellow | 32039 | 3203924 | — |
| 4 | Technic Axle Connector with Axle Hole | Black | 32039 | 3203926 | — |
| 6 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] | Light Bluish Gray | 32054 | 4211865 | — |
| 10 | Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] | Black | 32054 | 3205426 | — |
| 11 | Technic Axle 2 Notched | Red | 32062 | 4142865 | €0,07 |
| 2 | Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin | Red | 32064a | 6196217 | €0,17 |
| 1 | Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin | Light Bluish Gray | 32064a | 6206249 | €0,17 |
| 4 | Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin | Dark Bluish Gray | 32064a | 6178919 | €0,17 |
| 2 | Technic Knob Wheel | Black | 32072 | 6284188 | €0,27 |
| 6 | Technic Axle 5 | Yellow | 32073 | 6130008 | €0,11 |
| 3 | Technic Axle 5 | Light Bluish Gray | 32073 | 4211639 | €0,11 |
| 9 | Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced | Yellow | 32123b | 6271167 | €0,04 |
| 8 | Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced | Light Bluish Gray | 32123b | 6271165 | €0,04 |
| 1 | Technic Beam 2 x 4 L-Shape Thick | Light Bluish Gray | 32140 | 6271831 | €0,15 |
| 16 | Technic Beam 2 x 4 L-Shape Thick | Dark Bluish Gray | 32140 | 6271830 | €0,15 |
| 7 | Technic Beam 2 x 4 L-Shape Thick | Yellow | 32140 | 6271828 | €0,15 |
| 4 | Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole | Black | 32184 | 6276951 | €0,12 |
| 2 | Technic Axle and Pin Connector Angled #4 - 135° | Black | 32192 | 6262897 | €0,19 |
| 8 | Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin | Dark Bluish Gray | 32250 | 32250199 | — |
| 3 | Technic Gear 12 Tooth Double Bevel | Black | 32270 | 4177431 | €0,18 |
| 1 | Technic Beam 1 x 9 Bent (7 - 3) Thick | Light Bluish Gray | 32271 | 6276836 | €0,33 |
| 4 | Technic Beam 1 x 15 Thick | Dark Bluish Gray | 32278 | 4542576 | €0,42 |
| 6 | Technic Beam 1 x 15 Thick | Light Bluish Gray | 32278 | 4542577 | €0,42 |
| 5 | Technic Beam 1 x 5 Thick | White | 32316 | 4249021 | €0,19 |
| 3 | Technic Beam 1 x 5 Thick | Light Bluish Gray | 32316 | 4211651 | €0,19 |
| 10 | Technic Beam 1 x 5 Thick | Dark Bluish Gray | 32316 | 4210686 | €0,19 |
| 2 | Technic Beam 1 x 7 Bent (4 - 4) Thick | Dark Bluish Gray | 32348 | 32348199 | — |
| 5 | Brick 1 x 2 x 2 with Inside Stud Holder | White | 3245c | 4113261 | €0,13 |
| 4 | Brick 1 x 2 x 2 with Inside Stud Holder | Dark Bluish Gray | 3245c | 4210978 | €0,13 |
| 1 | Technic Gear 36 Tooth Double Bevel | Black | 32498 | 4255563 | €0,90 |
| 3 | Technic Beam 1 x 3 Thick | Yellow | 32523 | 4153707 | €0,10 |
| 4 | Technic Beam 1 x 3 Thick | Black | 32523 | 4509376 | €0,10 |
| 10 | Technic Beam 1 x 3 Thick | Dark Bluish Gray | 32523 | 4210751 | €0,10 |
| 2 | Technic Beam 1 x 3 Thick | White | 32523 | 4208160 | €0,10 |
| 4 | Technic Beam 1 x 3 Thick | Light Bluish Gray | 32523 | 4211655 | €0,10 |
| 2 | Technic Beam 1 x 7 Thick | Yellow | 32524 | 4495934 | €0,25 |
| 2 | Technic Beam 1 x 7 Thick | Black | 32524 | 4506043 | €0,25 |
| 4 | Technic Beam 1 x 7 Thick | White | 32524 | 4495927 | €0,25 |
| 4 | Technic Beam 1 x 7 Thick | Light Bluish Gray | 32524 | 4495930 | €0,25 |
| 1 | Technic Beam 1 x 11 Thick | Light Bluish Gray | 32525 | 4611705 | €0,33 |
| 2 | Technic Beam 1 x 11 Thick | Black | 32525 | 6029578 | €0,33 |
| 14 | Technic Beam 1 x 11 Thick | White | 32525 | 6028103 | €0,33 |
| 12 | Technic Beam 1 x 11 Thick | Dark Bluish Gray | 32525 | 4603472 | €0,33 |
| 2 | Technic Beam 3 x 5 L-Shape Thick | White | 32526 | 4585040 | €0,24 |
| 4 | Technic Pin Connector Plate with One Hole (Single on Bottom) | Black | 32529 | 4144023 | — |
| 2 | Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] | Dark Bluish Gray | 32530 | 4210763 | €0,13 |
| 3 | Technic Pin Long without Friction Ridges | Tan | 32556 | — | — |
| 4 | Technic Pin Connector Perpendicular Long | Light Bluish Gray | 32557 | 4211714 | €0,22 |
| 4 | Technic Beam 3 x 0.5 Liftarm with Boss and Pin Semi-Reduced | Light Bluish Gray | 33299b | 4563045 | — |
| 1 | Animal, Frog | Pearl Gold | 33320 | 6171138 | €0,11 |
| 6 | Plate 1 x 8 | Dark Bluish Gray | 3460 | 4210998 | €0,18 |
| 7 | Plate 1 x 8 | Light Bluish Gray | 3460 | 4211425 | €0,18 |
| 20 | Plate 1 x 3 | Dark Bluish Gray | 3623 | 4211133 | €0,07 |
| 22 | Plate 1 x 3 | Light Bluish Gray | 3623 | 4211429 | €0,07 |
| 1 | Technic Gear 40 Tooth | Light Bluish Gray | 3649 | 6195314 | €0,82 |
| 6 | Brick Arch 1 x 4 | Light Bluish Gray | 3659 | 4211435 | €0,16 |
| 1 | Slope Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] | Light Bluish Gray | 3660 | 4211436 | — |
| 1 | Slope Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] | White | 3660 | 366001 | — |
| 2 | Plate 1 x 6 | Red | 3666 | 366621 | €0,17 |
| 4 | Plate 1 x 6 | Dark Bluish Gray | 3666 | 4211056 | €0,17 |
| 24 | Technic Pin without Friction Ridges Lengthwise | Light Bluish Gray | 3673 | 4211807 | €0,05 |
| 4 | Slope 65° 2 x 2 x 2 with Bottom Tube | Dark Bluish Gray | 3678b | 4234534 | €0,22 |
| 8 | Technic Brick 1 x 2 [1 Pin Hole] | Dark Bluish Gray | 3700 | 4211111 | €0,12 |
| 2 | Technic Brick 1 x 2 [1 Pin Hole] | Light Bluish Gray | 3700 | 4211440 | €0,12 |
| 4 | Technic Brick 1 x 4 [3 Pin Holes] | Dark Bluish Gray | 3701 | 4213607 | €0,17 |
| 2 | Technic Brick 1 x 8 [7 Pin Holes] | Light Bluish Gray | 3702 | 4211442 | €0,36 |
| 9 | Technic Axle 4 | Red | 3705 | 6129995 | €0,08 |
| 5 | Technic Axle 4 | Black | 3705 | 370526 | €0,08 |
| 2 | Technic Axle 6 | Red | 3706 | 6130002 | €0,12 |
| 3 | Technic Axle 6 | Black | 3706 | 370626 | €0,12 |
| 3 | Technic Axle 8 | Black | 3707 | 370726 | €0,22 |
| 2 | Technic Axle 12 | Red | 3708 | 6147702 | €0,27 |
| 10 | Technic Axle 12 | Black | 3708 | 370826 | €0,27 |
| 7 | Technic Plate 2 x 4 [3 Holes] | White | 3709 | 370901 | €0,13 |
| 7 | Plate 1 x 4 | Red | 3710 | 371021 | €0,12 |
| 2 | Plate 1 x 4 | Light Bluish Gray | 3710 | 4211445 | €0,12 |
| 15 | Plate 1 x 4 | White | 3710 | 371001 | €0,12 |
| 10 | Plate 1 x 4 | Dark Bluish Gray | 3710 | 4211001 | €0,12 |
| 11 | Technic Bush | Light Bluish Gray | 3713 | 6275844 | €0,05 |
| 2 | Technic Plate 2 x 8 [7 Holes] | Light Bluish Gray | 3738 | 4211449 | €0,29 |
| 2 | Technic Gear Rack 1 x 4 | Light Bluish Gray | 3743 | 6457283 | €0,19 |
| 1 | Slope Inverted 33° 3 x 2 [Connections between Studs] | Dark Bluish Gray | 3747b | 4211064 | — |
| 10 | Technic Axle Pin without Friction Ridges Lengthwise | Tan | 3749 | 4666579 | €0,06 |
| 2 | Plate 2 x 6 | White | 3795 | 379501 | €0,19 |
| 5 | Plate 2 x 6 | Light Bluish Gray | 3795 | 4211452 | €0,19 |
| 1 | Plate 2 x 6 | Dark Bluish Gray | 3795 | 4211002 | €0,19 |
| 5 | Plate 2 x 10 | Light Bluish Gray | 3832 | 4211462 | €0,29 |
| 1 | Plate 2 x 10 | White | 3832 | 383201 | €0,29 |
| 1 | Weapon Axe | Black | 3835 | 383526 | €0,12 |
| 4 | Technic Brick 1 x 6 [5 Pin Holes] | Dark Bluish Gray | 3894 | 4210917 | €0,29 |
| 2 | Technic Brick 1 x 6 [5 Pin Holes] | Yellow | 3894 | 389424 | €0,29 |
| 4 | Brick Round 2 x 2 with Axle Hole | Light Bluish Gray | 3941 | 4211526 | €0,11 |
| 5 | Brick Round 2 x 2 with Axle Hole | Yellow | 3941 | 614324 | €0,11 |
| 13 | Brick Round 2 x 2 with Axle Hole | Trans-Clear | 3941 | 6514281 | €0,19 |
| 1 | Cone 2 x 2 x 2, Open Stud | Yellow | 3942c | 394224 | — |
| 1 | Dish 4 x 4 Inverted [Radar] | White | 3960 | 396001 | €0,24 |
| 2 | Dish 4 x 4 Inverted [Radar] | Trans-Light Blue | 3960 | 4293877 | — |
| 1 | Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) | Medium Azure | 4032a | 6109752 | €0,06 |
| 13 | Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) | Light Bluish Gray | 4032a | 4211475 | €0,06 |
| 5 | Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) | Black | 4032a | 403226 | €0,06 |
| 11 | Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) | White | 4032a | 403201 | €0,06 |
| 4 | Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) | Yellow | 4032a | 403224 | €0,06 |
| 12 | Technic Beam 1 x 9 Thick | Dark Bluish Gray | 40490 | 4645730 | €0,29 |
| 4 | Technic Beam 1 x 9 Thick | Light Bluish Gray | 40490 | 6102449 | €0,29 |
| 4 | Technic Beam 1 x 9 Thick | Black | 40490 | 6115617 | €0,29 |
| 1 | Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] | White | 4081b | 6281990 | €0,10 |
| 1 | Plate 8 x 8 | Dark Bluish Gray | 41539 | 4210802 | €0,99 |
| 5 | Tile 1 x 8 with Groove | Light Bluish Gray | 4162 | 4211481 | €0,15 |
| 4 | Tile 1 x 8 with Groove | Medium Azure | 4162 | 6078339 | €0,15 |
| 5 | Technic Beam 1 x 2 Thin | Dark Bluish Gray | 41677 | 6338422 | €0,13 |
| 2 | Technic Axle and Pin Connector Perpendicular Double Split | Dark Bluish Gray | 41678 | 4234599 | — |
| 2 | Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes | Dark Bluish Gray | 42003 | 6273715 | €0,12 |
| 1 | String Reel 2 x 4 x 2 Drum | Black | 4208 | 4109645 | — |
| 1 | String Reel 2 x 4 x 2 Holder With Open Studs | Red | 4209b | 420921 | — |
| 17 | Technic Pin 1/2 | Black | 4274 | 4143005 | €0,05 |
| 1 | Plate 2 x 16 | Dark Bluish Gray | 4282 | 4210796 | €0,51 |
| 1 | Dish 6 x 6 Inverted, Radar / Webbed [Anti-studs at 90°] | Trans-Light Blue | 4285b | 428542 | — |
| 3 | Slope 33° 3 x 1 | Dark Bluish Gray | 4286 | 4211045 | €0,10 |
| 15 | Technic Axle Pin with Friction Ridges Lengthwise | Black | 43093 | 4206482 | €0,06 |
| 1 | Box 2 x 2 x 2 [Hollow Studs] | Red | 4345b | 4261628 | €0,33 |
| 1 | Box 2 x 2 x 2 Door with Slot | Light Bluish Gray | 4346 | 4211492 | €0,16 |
| 1 | Equipment Camera with Side Sight [aka Space Gun] | Black | 4360 | 436026 | €0,51 |
| 11 | Technic Beam 1 x 2 Thick | Light Bluish Gray | 43857 | 4211862 | €0,12 |
| 1 | Technic Axle 7 | Yellow | 44294 | 6130009 | €0,16 |
| 13 | Technic Axle 7 | Light Bluish Gray | 44294 | 4211805 | €0,16 |
| 2 | Bracket 1 x 2 - 2 x 2 | Light Bluish Gray | 44728 | 6117967 | €0,10 |
| 2 | Bracket 1 x 2 - 2 x 2 | Red | 44728 | 6117974 | €0,10 |
| 2 | Bracket 1 x 2 - 2 x 2 | White | 44728 | 6117940 | €0,10 |
| 2 | Bracket 1 x 2 - 2 x 2 | Yellow | 44728 | 6117938 | €0,10 |
| 9 | Plate 1 x 10 | White | 4477 | 447701 | €0,16 |
| 1 | Plate Special 1 x 8 with Door Rail | Light Bluish Gray | 4510 | 4211498 | €0,22 |
| 5 | Technic Axle 3 | Yellow | 4519 | 6130007 | €0,05 |
| 8 | Technic Axle 3 | Light Bluish Gray | 4519 | 4211815 | €0,05 |
| 1 | Slope Curved 4 x 4 x 2/3 Triple Curved with 2 Studs | Red | 45677 | 4193074 | €0,31 |
| 4 | Slope Curved 4 x 4 x 2/3 Triple Curved with 2 Studs and 'HYDRO DYNAMICS COACH' print | White | 45677pr0007 | 6203918 | — |
| 1 | Windscreen 2 x 4 x 2 Vertical | Trans-Clear | 4594 | 6507908 | €0,44 |
| 1 | Bar 1 x 3 [Clip / Anti-Stud] | Black | 4735 | 4141580 | €0,13 |
| 22 | Brick Round Corner 4 x 4 Macaroni Wide with 3 Studs | Medium Azure | 48092 | 6097046 | — |
| 8 | Brick Round Corner 4 x 4 Macaroni Wide with 3 Studs | Medium Nougat | 48092 | 6022004 | €0,30 |
| 24 | Brick Round Corner 4 x 4 Macaroni Wide with 3 Studs | Light Bluish Gray | 48092 | 6452524 | €0,30 |
| 9 | Plate Special 1 x 2 [Side Handle Closed Ends] | Light Bluish Gray | 48336 | 4244627 | €0,07 |
| 2 | Technic Pin Connector Hub Perpendicular 3L with 4 Pins | Light Bluish Gray | 48989 | 4225033 | — |
| 2 | Slope Curved 3 x 1 No Studs | Bright Green | 50950 | 6462579 | €0,12 |
| 1 | Slope 30° 1 x 1 x 2/3 (Cheese Slope) | Trans-Dark Blue | 54200 | 6245256 | €0,08 |
| 1 | Slope 30° 1 x 1 x 2/3 (Cheese Slope) | Trans-Red | 54200 | 6245252 | €0,08 |
| 3 | Technic Axle 8 with Stop | Dark Bluish Gray | 55013 | 4499858 | €0,21 |
| 2 | Technic Tread Sprocket Wheel Small 6 Tooth | Black | 57520 | 4662228 | €0,31 |
| 2 | Technic Axle Connector Hub with 3 Axles at 120° | Light Bluish Gray | 57585 | 4502595 | €0,28 |
| 1 | Panel 1 x 6 x 5 | White | 59349 | 4504228 | €0,61 |
| 1 | Panel 1 x 6 x 5 | Dark Bluish Gray | 59349 | 4505068 | €0,61 |
| 3 | Technic Axle 5.5 with Stop [Rounded Short End] | Dark Bluish Gray | 59426 | 4508553 | €0,11 |
| 1 | Technic Axle Connector Smooth [with x Hole + Orientation] | Black | 59443 | 4512363 | €0,06 |
| 4 | Technic Axle Connector Smooth [with x Hole + Orientation] | Light Bluish Gray | 59443 | 4512360 | €0,06 |
| 1 | Technic Axle Connector Smooth [with x Hole + Orientation] | Yellow | 59443 | 4519010 | €0,06 |
| 9 | Technic Axle Connector Smooth [with x Hole + Orientation] | Reddish Brown | 59443 | 4531751 | €0,06 |
| 12 | Technic Axle Connector Smooth [with x Hole + Orientation] | Dark Bluish Gray | 59443 | 4516546 | €0,06 |
| 3 | Cone 1 x 1 [Top Groove] | Yellow | 59900 | 4525464 | €0,05 |
| 4 | Brick Arch 1 x 3 x 2 Curved Top | Light Bluish Gray | 6005 | 4541259 | — |
| 1 | Plate Round 4 x 4 with Pin Hole | White | 60474 | 4515347 | €0,17 |
| 4 | Plate Round 4 x 4 with Pin Hole | Light Bluish Gray | 60474 | 4515351 | €0,17 |
| 1 | Plate Round 4 x 4 with Pin Hole | Bright Light Orange | 60474 | 6115115 | €0,17 |
| 8 | Plate 1 x 12 | Light Bluish Gray | 60479 | 4514846 | €0,23 |
| 4 | Slope 65° 2 x 1 x 2 | Dark Bluish Gray | 60481 | 6013658 | €0,12 |
| 2 | Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole | Black | 60483 | 6265091 | €0,07 |
| 1 | Technic Beam 3 x 3 T-Shape Thick | Light Bluish Gray | 60484 | 4552348 | €0,18 |
| 6 | Technic Axle 9 | Light Bluish Gray | 60485 | 4535768 | €0,21 |
| 1 | Technic Axle 9 | Yellow | 60485 | 6130010 | €0,21 |
| 1 | Door Frame 1 x 4 x 6 Type 2 | Black | 60596 | 6337273 | €0,38 |
| 1 | Door 1 x 4 x 6 with 4 Panes and Stud Handle | White | 60623 | 4521943 | €0,47 |
| 1 | Brick Curved 2 x 4 x 1 1/3 | Light Bluish Gray | 6081 | 4260409 | €0,27 |
| 1 | Brick Curved 2 x 4 x 1 1/3 | Red | 6081 | 4116617 | €0,27 |
| 1 | Equipment Hose Nozzle / Gun with Side String Hole Simplified | Light Bluish Gray | 60849 | 4514195 | €0,12 |
| 6 | Brick 1 x 12 | Light Bluish Gray | 6112 | 4211522 | €0,39 |
| 3 | Plate Round 1 x 1 with Solid Stud | Medium Azure | 6141 | 6102986 | €0,05 |
| 4 | Plate Round 1 x 1 with Solid Stud | Pearl Gold | 6141 | 4523159 | €0,05 |
| 6 | Plate Round 1 x 1 with Solid Stud | Light Bluish Gray | 6141 | 4211525 | €0,05 |
| 4 | Plate Round 1 x 1 with Solid Stud | Black | 6141 | 614126 | €0,05 |
| 6 | Plate Round 1 x 1 with Solid Stud | White | 6141 | 614101 | €0,05 |
| 2 | Plate Round 1 x 1 with Solid Stud | Red | 6141 | 614121 | €0,05 |
| 3 | Brick Arch 1 x 6 x 2 Curved Top | Light Bluish Gray | 6183 | 4211751 | — |
| 2 | Brick Arch 1 x 6 x 2 Curved Top | White | 6183 | 6132772 | €0,35 |
| 6 | Technic Universal Joint 3L [Complete Assembly] | Light Bluish Gray | 61903 | 6335279 | €0,74 |
| 2 | Brick Round 4 x 4 with 4 Side Pin Holes and Center Axle Hole | Light Bluish Gray | 6222 | 4211527 | €0,88 |
| 2 | Windscreen 3 x 6 x 1 Curved with 2 Circular Stud Holders in Bottom | Trans-Light Blue | 62360 | 4599045 | — |
| 1 | Technic Pin Connector Round [Slotted] | Pearl Gold | 62462 | 6390147 | €0,06 |
| 1 | Technic Pin Connector Round [Slotted] | Bright Green | 62462 | 6173135 | €0,06 |
| 10 | Technic Pin Connector Round [Slotted] | Yellow | 62462 | 6173122 | €0,06 |
| 7 | Technic Pin Connector Round [Slotted] | Light Bluish Gray | 62462 | 6173127 | €0,06 |
| 4 | Technic Panel Curved 11 x 3 with 2 Pin Holes through Panel Surface | Yellow | 62531 | 4540613 | — |
| 10 | Cylinder Half 2 x 4 x 4 | Trans-Light Blue | 6259 | 4513976 | — |
| 1 | Tile 1 x 3 | Red | 63864 | 4533742 | €0,11 |
| 5 | Tile 1 x 3 | Yellow | 63864 | 4558172 | €0,11 |
| 1 | Technic Axle and Pin Connector Perpendicular Triple | Light Bluish Gray | 63869 | 6331441 | €0,17 |
| 2 | Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick | Light Bluish Gray | 64178 | 4540797 | €1,26 |
| 5 | Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick | Light Bluish Gray | 64179 | 4539880 | €0,91 |
| 2 | Technic Panel 5 x 11 x 1 | Light Bluish Gray | 64782 | 6474925 | €1,19 |
| 6 | Technic Panel 5 x 11 x 1 | Light Bluish Gray | 64782 | 4545101 | — |
| 2 | Technic Axle and Pin Connector Perpendicular | Yellow | 6536 | 6261367 | €0,10 |
| 2 | Technic Axle and Pin Connector Perpendicular | White | 6536 | 6261372 | €0,10 |
| 3 | Technic Axle and Pin Connector Perpendicular | Light Bluish Gray | 6536 | 6261375 | €0,10 |
| 7 | Technic Brick 1 x 1 with Pin Hole | Light Bluish Gray | 6541 | 4211535 | €0,07 |
| 2 | Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) | Dark Bluish Gray | 6553 | 4210665 | €0,19 |
| 104 | Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots | Black | 6558 | 4514553 | — |
| 2 | Technic Gear 12 Tooth Bevel | Tan | 6589 | 4565452 | €0,10 |
| 5 | Technic Pin with Friction Ridges Lengthwise and Towball | Black | 6628 | 4184169 | — |
| 11 | Tile 1 x 6 with Groove | Light Bluish Gray | 6636 | 4211549 | €0,13 |
| 2 | Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] | Yellow | 73983 | 4205196 | — |
| 2 | Hose, Ribbed 7mm D. 18L / 14.4cm | Flat Silver | 78c18 | 4620068 | — |
| 24 | Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] | Yellow | 85080 | 6064227 | €0,10 |
| 48 | Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] | White | 85080 | 4567449 | €0,10 |
| 2 | Wave / Flame Rounded Large with Marbled Trans-Yellow Pattern | Trans-Red | 85959pat0003 | 6513987 | €0,74 |
| 1 | Slope 30? 1 x 2 x 2/3 | Red | 85984 | 4651524 | €0,07 |
| 18 | Slope 30? 1 x 2 x 2/3 | Light Bluish Gray | 85984 | 4568637 | €0,07 |
| 5 | Tile 2 x 4 with Groove | Dark Bluish Gray | 87079 | 4560184 | €0,16 |
| 3 | Tile 2 x 4 with Groove | Red | 87079 | 4560179 | €0,16 |
| 1 | Tile 2 x 4 with Groove | White | 87079 | 4560178 | €0,16 |
| 4 | Technic Panel Fairing #1 Small Smooth Short, Side A | Dark Purple | 87080 | 6185606 | — |
| 6 | Brick Round 4 x 4 Centre Hole | Red | 87081 | 4610843 | €0,36 |
| 1 | Brick Round 4 x 4 Centre Hole | Reddish Brown | 87081 | 6034334 | — |
| 1 | Plate Special 2 x 2 with Groove and Center Stud (Jumper) | Light Bluish Gray | 87580 | 6126082 | €0,07 |
| 3 | Plate Special 2 x 2 with Groove and Center Stud (Jumper) | White | 87580 | 6126046 | €0,07 |
| 4 | Wedge 2 x 2 Facet | Light Bluish Gray | 87620 | 4651063 | €0,15 |
| 2 | Technic Gear Rack 1 x 7 with Axle and Pin Holes | Black | 87761 | 6327430 | €0,82 |
| 12 | Technic Link Tread Wide with Two Pin Holes, Reinforced | Medium Nougat | 88323 | 6442980 | €0,34 |
| 2 | Technic Link Tread Wide with Two Pin Holes, Reinforced | Dark Bluish Gray | 88323 | 4566742 | — |
| 2 | Plate 8 x 16 | Dark Bluish Gray | 92438 | 4654613 | €2,17 |
| 2 | Brick Arch 1 x 6 Raised Arch | Light Bluish Gray | 92950 | 4618874 | €0,19 |
| 8 | Slope Curved 4 x 1 Double with No Studs | Light Bluish Gray | 93273 | 4622803 | €0,15 |
| 6 | Bracket 1 x 2 - 2 x 4 | Light Bluish Gray | 93274 | 6118827 | €0,15 |
| 2 | Technic Gear 16 Tooth Reinforced [New Style] | Light Bluish Gray | 94925 | 4640536 | €0,21 |
| 1 | Brick and Axle Separator v2.0 | Orange | 96874 | 4654448 | — |
| 2 | Tile Round 1 x 1 | Trans-Red | 98138 | 6258607 | €0,05 |
| 2 | Tile Round 1 x 1 | Trans-Clear | 98138 | 6274738 | €0,05 |
| 4 | Brick Special 1 x 2 with Masonry Brick Profile | Dark Bluish Gray | 98283 | 6000311 | €0,13 |
| 3 | Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle Holes | Light Bluish Gray | 98585 | 6186129 | €0,33 |
| 7 | Technic Axle 4 with Centre Stop | Tan | 99008 | 4666999 | €0,10 |
| 2 | Bracket 1 x 2 - 2 x 2 Inverted | Light Bluish Gray | 99207 | 4654580 | €0,10 |
| 2 | Bracket 1 x 2 - 2 x 2 Inverted | Black | 99207 | 6000650 | €0,10 |

## Notes

- Track which of these parts you own and see what is missing: https://www.brickmissing.com/sets/45804-1-hydro-dynamics-challenge-kit
- Inventory data is based on official LEGO inventories via the Rebrickable catalog, updated daily.
- Part images, minifigure lists and related sets are on the set page: https://www.brickmissing.com/sets/45804-1-hydro-dynamics-challenge-kit