How many pieces does the LEGO HYDRO DYNAMICS Challenge Kit (45804-1) have?

The LEGO HYDRO DYNAMICS Challenge Kit set (45804-1) contains 2052 pieces. It was released in 2017 as part of the LEGO FIRST LEGO League theme.

How can I find missing parts for LEGO set 45804-1?

On BrickMissing you can check which parts from the LEGO HYDRO DYNAMICS Challenge Kit (45804-1) you already own. Add your LEGO collection and we'll show exactly which of the 2052 pieces you're missing and which you already have.

Can I build the LEGO HYDRO DYNAMICS Challenge Kit with parts I already have?

Use BrickMissing's free parts checker to find out. Add LEGO sets you own to your collection and we'll cross-reference all 2052 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO HYDRO DYNAMICS Challenge Kit from?

The LEGO HYDRO DYNAMICS Challenge Kit (45804-1) belongs to the LEGO FIRST LEGO League theme. You can browse all FIRST LEGO League sets on BrickMissing to find more sets from this theme.

HYDRO DYNAMICS Challenge Kit

45804-1 FIRST LEGO League 2017 2052 parts 0.8% repair risk Advanced

HYDRO DYNAMICS Challenge Kit (45804-1) is a LEGO FIRST LEGO League from 2017. The set contains 2,052 parts across 12 part and colour combinations in 7 colours — the full inventory below shows exactly which pieces you need to build or complete it.

Parts Inventory

🧱 2052 parts

Part	Color	Qty	LEGO price each
Wheel 14mm D. x 9.9mm with Centre Groove, Fake Bolts and 6 Spokes 11208	Light Bluish Gray	4×	€0,16 View at LEGO → View
Tyre 21 x 9.9 11209	Black	4×	€0,42 View at LEGO → View
Brick Special 1 x 2 with 2 Studs on 1 Side 11211	Light Bluish Gray	4×	€0,13 View at LEGO → View
Brick Special 1 x 2 with 2 Studs on 1 Side 11211	White	4×	€0,13 View at LEGO → View
Plate Round 6 x 6 with Hole 11213	Medium Azure	5×	€0,41 View at LEGO → View
Plate Round 6 x 6 with Hole 11213	White	1×	€0,41 View at LEGO → View
Plate Round 6 x 6 with Hole 11213	Light Bluish Gray	1×	€0,41 View at LEGO → View
Plate Special 1 x 2 with Pin Hole on Top 11458	Red	2×	€0,10 View at LEGO → View
Slope Curved 2 x 1 No Studs [1/2 Bow] 11477	Medium Azure	1×	€0,06 View at LEGO → View
Plate Round 4 x 4 with 2 x 2 Round Opening 11833	Trans-Clear	13×	€0,36 View at LEGO → View
Plate Round 4 x 4 with 2 x 2 Round Opening 11833	Bright Light Orange	11×	Check price → View
Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel Surface 11954	Medium Azure	6×	Check price → View

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Repairability

Can you fix HYDRO DYNAMICS Challenge Kit if a piece goes missing?

0.8%Low repair risk

easy to fixguard this box

3 of the 372 part+color combinations in this set appear in 3 or fewer sets ever made. Lose one of those and a replacement is very hard to find.

Theme average

14.4%

All sets

6.7%

Hardest to replace

Slope Curved 4 x 4 x 2/3 Triple Curved · White · only this setTechnic Panel Curved 11 x 3 · Medium Azure · 3 sets everTechnic Panel Fairing #1 Small Smooth Sh… · Dark Purple · 3 sets ever

How we calculate this →