How many pieces does the LEGO ROBOLAB Amusement Park Set (9725-3) have?

The LEGO ROBOLAB Amusement Park Set set (9725-3) contains 306 pieces. It was released in 2005 as part of the LEGO Mindstorms theme.

How can I find missing parts for LEGO set 9725-3?

On BrickMissing you can check which parts from the LEGO ROBOLAB Amusement Park Set (9725-3) you already own. Add your LEGO collection and we'll show exactly which of the 306 pieces you're missing and which you already have.

Can I build the LEGO ROBOLAB Amusement Park Set 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 306 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO ROBOLAB Amusement Park Set from?

The LEGO ROBOLAB Amusement Park Set (9725-3) belongs to the LEGO Mindstorms theme. You can browse all Mindstorms sets on BrickMissing to find more sets from this theme.

ROBOLAB Amusement Park Set

🏷️ 9725-3•🎨 Mindstorms•📅 2005•🧱 306 parts•Intermediate

ROBOLAB Amusement Park Set (9725-3) is a LEGO Mindstorms from 2005. This page uses the available set and theme data until a fuller product description is available.

Parts Inventory

🧱 306 parts

Part	Color	Qty
Tyre 30 x 10.5 Offset Tread 2346	Black	2×
Tile 1 x 4 with Groove 2431	Black	2×
Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] 2444	Black	4×
Costume Ghost Shroud 2588	Glow In Dark Opaque	1×
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] 2654	Black	2×
Technic Pin with Friction Ridges Lengthwise and Center Slots 2780	Black	12×
Technic Wedge Belt Wheel Tire 2815	Black	2×
Technic Beam 1 x 4 Thin with Stud Connector 2825	Light Bluish Gray	2×
Technic Engine Crankshaft Center 2854	Dark Bluish Gray	2×
Sensor, Light with Fixed Cable 2982c01	Black	1×

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Technic Pin with Friction Ridges Lengthwise and Center Slots	2780	Black	12×
Technic Wedge Belt Wheel Tire	2815	Black	2×
Technic Beam 1 x 4 Thin with Stud Connector	2825	Light Bluish Gray	2×
Technic Engine Crankshaft Center	2854	Dark Bluish Gray	2×
Sensor, Light with Fixed Cable	2982c01	Black	1×
Motor Pulley, 9V Micromotor with axle hole	2983	Light Bluish Gray	2×
Brick 2 x 4	3001	Red	2×
Brick 1 x 2	3004	Red	4×
Plate 1 x 2	3023	Black	6×
Slope 45° 2 x 1 with Bottom Pin	3040b	Red	4×
Tile 2 x 2 with Groove	3068b	Yellow	1×
Tile 2 x 2 with Groove	3068b	Black	1×
Tile 2 x 2 with Groove	3068b	Red	1×
Tile 2 x 2 with Groove	3068b	White	1×
Tile 1 x 2 with Groove	3069b	Black	1×
Tile 1 x 2 with Groove	3069b	Red	1×
Tile 1 x 2 with Groove	3069b	White	1×
Tile 1 x 2 with Groove	3069b	Yellow	1×
Technic Pin 3/4	32002	Dark Bluish Gray	8×
Technic Axle and Pin Connector Angled #1	32013	Black	2×
Technic Beam 1 x 5 Thin	32017	Light Bluish Gray	8×
Plate Special 1 x 2 with Door Rail	32028	Light Bluish Gray	4×
Technic Axle Connector with Axle Hole	32039	Light Bluish Gray	2×
Technic Axle 2 Notched	32062	Black	4×
Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin	32064a	Light Bluish Gray	4×
Technic Axle 5	32073	Light Bluish Gray	2×
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced	32123b	Light Bluish Gray	8×
Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle Hole	32124	Black	2×
Technic Plate Rotor 3 Blade with Smooth Ends and 6 Studs (Propeller)	32125	Black	2×
Plate 1 x 8	3460	Black	2×
Wheel with Split Axle hole	3482	Yellow	10×
Tyre Offset Tread 24 x 8	3483	Black	2×
Tyre 43 x 17	3634	Black	2×
Technic Gear 8 Tooth	3647	Light Bluish Gray	3×
Technic Gear 24 Tooth [New Style with Single Axle Hole]	3648b	Light Bluish Gray	2×
Technic Gear 40 Tooth	3649	Light Bluish Gray	1×
Technic Gear 24 Tooth Crown with Reinforcements [New Style]	3650c	Light Bluish Gray	2×
Technic Pin without Friction Ridges Lengthwise	3673	Light Bluish Gray	12×
Technic Brick 1 x 2 [1 Pin Hole]	3700	Red	4×
Technic Brick 1 x 4 [3 Pin Holes]	3701	Red	4×
Technic Brick 1 x 8 [7 Pin Holes]	3702	Red	4×
Technic Brick 1 x 16 [15 Pin Holes]	3703	Red	2×
Technic Axle 4	3705	Black	2×
Technic Axle 6	3706	Black	2×
Technic Axle 8	3707	Black	2×
Technic Axle 12	3708	Black	2×
Technic Plate 2 x 4 [3 Holes]	3709	Black	4×
Plate 1 x 4	3710	Black	2×
Technic Bush	3713	Light Bluish Gray	20×
Technic Axle 10	3737	Black	3×
Technic Plate 2 x 8 [7 Holes]	3738	Black	4×
Technic Gear Rack 1 x 4	3743	Light Bluish Gray	4×
Technic Axle Pin without Friction Ridges Lengthwise	3749	Tan	8×
Plate Special 1 x 2 with 1 Stud without Groove (Jumper)	3794a	Brown	4×
Plate 2 x 6	3795	Black	2×
Baseplate 16 x 32	3857	Light Bluish Gray	1×
Technic Brick 1 x 6 [5 Pin Holes]	3894	Red	4×
Technic Brick 1 x 12 [11 Pin Holes]	3895	Red	4×
Brick Round 2 x 2 with Axle Hole	3941	Red	2×
Bracket 2 x 2 - 2 x 2	3956	Black	2×
Technic Gear 16 Tooth with Round Holes [Old Style]	4019	Light Bluish Gray	2×
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)	4032a	Black	2×
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)	4032a	White	2×
Technic Wedge Belt Wheel [aka Pulley]	4185	Light Bluish Gray	2×
Technic Pin 1/2	4274	Light Bluish Gray	4×
Motor, 9V Mini [Lightweight New Style]	43362c01	Light Bluish Gray	2×
Panel 2 x 5 x 6 Wall with Window Stones and 2 Columns Print	4444pr0008	Black	1×
Plate 1 x 10	4477	Black	4×
Technic Axle 3	4519	Light Bluish Gray	2×
Technic Worm Gear	4716	Black	2×
Wire with Brick 2 x 2 x 2/3 Pair, 11L	5306bc011	Black	2×
Wire with Brick 2 x 2 x 2/3 Pair, 17L	5306bc017	Black	2×
Wire with Brick 2 x 2 x 2/3 Pair, 33L	5306bc033	Black	2×
Light Brick 1 x 2 with Single Side Light	6035	White	1×
Technic Axle and Pin Connector Perpendicular	6536	Light Bluish Gray	3×
Technic Axle Connector Ridged [with x Hole x Orientation]	6538b	Light Bluish Gray	2×
Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle)	6553	Light Bluish Gray	2×
Technic Cam	6575	Dark Bluish Gray	2×
Technic Axle 3 with Stud	6587	Dark Bluish Gray	2×
Technic Gearbox 2 x 4 x 3 1/3	6588	Yellow	1×
Technic Gear 12 Tooth Bevel	6589	Light Bluish Gray	4×
Technic Beam 1 x 3 Thin	6632	Light Bluish Gray	2×
Storage Bin Lid, Dacta, 19 x 24	71082	Trans-Clear	1×
Rubber Band Small 13mm (Square Cross Section)	71509	Black	4×
Rubber Belt Small [15mm ID] [Round Cross Section]	85543	White	2×
Technic Rubber Belt Medium [26mm ID] [Round Cross Section]	85545	Black	1×
Sensor, Touch	879	Light Bluish Gray	2×
Storage / Sorting Tray, Dacta, 34 Compartment for Dacta Small Bin	997251	Trans-Clear	1×
Storage Bin, Dacta, Small	upn0032	Black	1×

Build DNA

Parts inventory insights for ROBOLAB Amusement Park Set

306 pieces puts this build -35% against the average Mindstorms set and -9% against the average 2005 release.

LEGOMINDSTORMS

Vs average Mindstorms set

-35%-168 parts

This set306

Average set474

Average Mindstorms set: 474 pieces across 33 other sets.

Vs average 2005 set

-9%-32 parts

This set306

Average set338

Average 2005 set: 338 pieces across 194 other sets.

Color profile

11different colors

Dominant color

Light Bluish Gray

Light Bluish Gray104x

37%

Black95x

33%

Red36x

13%

Dark Bluish Gray14x

Unique parts

3.2 pieces per unique type

Repeat factor

Average pieces per unique type.

Most used part

Technic Bush

20x

Results are based on official LEGO part inventories. Accuracy improves as you confirm set completeness.

This site is not affiliated with or endorsed by the LEGO Group.

Build Insights🧩89unique parts🎨11different colors📊27.8avg. parts per color🏆20×Technic Bush

🎨 All Mindstorms sets 📅 All sets from 2005

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