How many pieces does the LEGO Robotics Discovery Set (9735-1) have?

The LEGO Robotics Discovery Set set (9735-1) contains 390 pieces. It was released in 1999 as part of the LEGO Mindstorms theme.

How can I find missing parts for LEGO set 9735-1?

On BrickMissing you can check which parts from the LEGO Robotics Discovery Set (9735-1) you already own. Add your LEGO collection and we'll show exactly which of the 390 pieces you're missing and which you already have.

Can I build the LEGO Robotics Discovery 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 390 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO Robotics Discovery Set from?

The LEGO Robotics Discovery Set (9735-1) belongs to the LEGO Mindstorms theme. You can browse all Mindstorms sets on BrickMissing to find more sets from this theme.

Robotics Discovery Set

🏷️ 9735-1•🎨 Mindstorms•📅 1999•🧱 390 parts•Intermediate

LEGO RCX 9735-1 Robotics Discovery Set focuses on Robotics Discovery Set as a buildable character or creature. Recognition comes from pose, face, silhouette and details that carry the subject's personality. That gives the model presence on the shelf.

Parts Inventory

🧱 390 parts

Part	Color	Qty
Tile 1 x 4 with Groove 2431	Light Gray	4×
Wedge Plate 3 x 3 Cut Corner 2450	Light Bluish Gray	2×
Brick 2 x 6 2456	Black	2×
Tile Special 1 x 1 with Clip and Straight Tips 2555	Black	4×
Brick Round Corner 4 x 4 Full Brick 2577	Black	4×
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] 2654	Black	2×
Technic Brick 1 x 10 [9 Pin Holes] 2730	Black	4×
Technic Pin with Friction Ridges Lengthwise and Center Slots 2780	Black	13×
Technic Beam 1 x 4 Thin with Stud Connector 2825	Light Gray	2×
Technic Engine Crankshaft Center 2854	Light Gray	2×

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Plate Round 2 x 2 with Rounded Bottom [Boat Stud]	2654	Black	2×
Technic Brick 1 x 10 [9 Pin Holes]	2730	Black	4×
Technic Pin with Friction Ridges Lengthwise and Center Slots	2780	Black	13×
Technic Beam 1 x 4 Thin with Stud Connector	2825	Light Gray	2×
Technic Engine Crankshaft Center	2854	Light Gray	2×
Brick 2 x 4	3001	Black	10×
Brick 2 x 2	3003	Black	2×
Brick 1 x 2	3004	Black	16×
Dome Hemisphere 4 x 4 Multifaceted	30208	Trans-Neon Green	2×
Plate Special 1 x 2 with 4 x 4 disk at 90 degrees	30209	Black	2×
Plate 2 x 2	3022	Light Gray	2×
Plate 1 x 2	3023	Light Gray	14×
Wing Insectoid Large with Arm Hinge and Circuitry Print Left (Print on Top, Tip on Left, Logo at Back Edge)	30230pr0001	Trans-Dark Blue	1×
Wing Insectoid Large with Arm Hinge and Circuitry Print Right (Print on Top, Tip on Right, Logo at Back Edge)	30230pr0002	Trans-Dark Blue	1×
Plate 6 x 10	3033	Light Gray	2×
Slope 45° 2 x 1 with Bottom Pin	3040b	Light Gray	4×
Tile 2 x 2 with Groove	3068b	Red	2×
Tile 1 x 2 with Groove	3069b	Light Gray	2×
Technic Brick 1 x 2 [2 Pin Holes]	32000	Light Gray	1×
Technic Plate 2 x 6 [5 Holes]	32001	Light Gray	6×
Technic Pin 3/4	32002	Dark Gray	8×
Technic Beam 1 x 11.5 Double Bent Thick	32009	Purple	2×
Technic Axle and Pin Connector Angled #1	32013	Black	4×
Technic Axle and Pin Connector Angled #6 - 90°	32014	Black	2×
Technic Axle and Pin Connector Angled #5 - 112.5°	32015	Light Gray	2×
Technic Axle and Pin Connector Angled #3 - 157.5?	32016	Black	4×
Technic Beam 1 x 5 Thin	32017	Light Gray	4×
Plate Special 1 x 2 with Door Rail	32028	Light Gray	4×
Technic Axle Connector with Axle Hole	32039	Light Gray	4×
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]	32054	Red	8×
Technic Axle 2 Notched	32062	Black	4×
Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin	32064a	Red	2×
Technic Axle 5	32073	Black	2×
Launcher, Technic Competition Cannon, Round Bottom with Black Ends	32074c02	Red	1×
Hub, Scout Brick [Complete Assembly]	32104c01	Black	1×
Technic Bush 1/2 Smooth with Axle Hole Reduced	32123a	Tan	8×
Plate 1 x 8	3460	Light Gray	2×
Wheel with Split Axle hole	3482	Red	2×
Plate 1 x 3	3623	Light Gray	4×
Tyre 43 x 17	3634	Black	2×
Technic Gear 8 Tooth	3647	Light Gray	4×
Technic Gear 24 Tooth [New Style with Single Axle Hole]	3648b	Light Gray	2×
Technic Gear 40 Tooth	3649	Light Gray	4×
Technic Gear 24 Tooth Crown with Reinforcements [New Style]	3650c	Light Gray	2×
Plate 1 x 6	3666	Light Gray	2×
Technic Pin without Friction Ridges Lengthwise	3673	Light Gray	12×
Technic Brick 1 x 2 [1 Pin Hole]	3700	Black	8×
Technic Brick 1 x 4 [3 Pin Holes]	3701	Black	4×
Technic Brick 1 x 8 [7 Pin Holes]	3702	Black	2×
Technic Brick 1 x 16 [15 Pin Holes]	3703	Black	6×
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	Light Gray	4×
Technic Plate 2 x 4 [3 Holes]	3709	Purple	2×
Plate 1 x 4	3710	Light Gray	4×
Plate 1 x 4	3710	Yellow	2×
Plate 1 x 4	3710	Red	6×
Technic Bush	3713	Light Gray	20×
Technic Axle 10	3737	Black	2×
Technic Plate 2 x 8 [7 Holes]	3738	Light Gray	6×
Slope Inverted 33° 3 x 2 [Connections between Studs]	3747b	Reddish Brown	2×
Technic Axle Pin without Friction Ridges Lengthwise	3749	Light Gray	8×
Plate 2 x 10	3832	Light Gray	2×
Technic Brick 1 x 6 [5 Pin Holes]	3894	Black	8×
Technic Brick 1 x 12 [11 Pin Holes]	3895	Black	2×
Hinge Brick 1 x 2 Base	3937	Black	2×
Hinge Brick 1 x 2 Top Plate Thin	3938	Black	2×
Brick Round 2 x 2 with Axle Hole	3941	Black	4×
Dish 4 x 4 Inverted [Radar]	3960	White	2×
Technic Gear 16 Tooth with Round Holes [Old Style]	4019	Light Gray	2×
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)	4032a	White	2×
Tile 1 x 8 with Groove	4162	Light Gray	2×
Technic Pin 1/2	4274	Light Gray	4×
Slope 33° 3 x 1	4286	Yellow	2×
Plate 1 x 10	4477	Light Gray	2×
Technic Axle 3	4519	Black	2×
Dish 2 x 2 Inverted [Radar]	4740	White	2×
Wire with Brick 2 x 2 x 2/3 Pair, 20L	5306bc020	Black	2×
Wire with Brick 2 x 2 x 2/3 Pair, 36L	5306bc036	Black	2×
Arm Piece with Pin, 2 Fingers	6048a	Black	2×
Plate Round 1 x 1 with Solid Stud	6141	Black	3×
Plate Round 1 x 1 with Solid Stud	6141	Light Gray	3×
Technic Axle and Pin Connector Perpendicular	6536	Light Gray	6×
Technic Axle Connector Ridged [with x Hole x Orientation]	6538b	Light Gray	4×
Technic Brick 1 x 1 with Pin Hole	6541	Black	4×
Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle)	6553	Light Gray	2×
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots	6558	Black	2×
Technic Cam	6575	Light Gray	2×
Tyre 20 x 30 Balloon Medium 49.6 x 20	6581	Black	2×
Wheel 20 x 30 Balloon Medium	6582	Red	2×
Technic Axle 3 with Stud	6587	Dark Gray	2×
Technic Beam 1 x 9 Bent (6 - 4) Thick	6629	Red	2×
Technic Beam 1 x 3 Thin	6632	Light Gray	4×
Motor, 9V Mini [Old Style]	71427c01	Light Gray	2×
Rubber Band Small 13mm (Square Cross Section)	71509	Black	4×
Ball 41mm	72048	Yellow	2×
Hose Rigid 3mm D. 16L / 12.8cm	75c16	Yellow	2×
Hose Rigid 3mm D. 36L / 28.8cm	75c36	Red	2×
Hose Rigid 3mm D. 44L / 35.2cm	75c44	Yellow	2×
Technic Gear 24 Tooth Clutch with Dark Gray or Light Gray Center	76019	White	2×
Projectile, Technic Competition Arrow, Beam Shaft with Solid Black Rubber End	76110c01	Yellow	2×
Sensor, Touch	879	Light Gray	2×

Build DNA

Parts inventory insights for Robotics Discovery Set

390 pieces puts this build -17% against the average Mindstorms set and +105% against the average 1999 release.

LEGOMINDSTORMS

Vs average Mindstorms set

-17%-81 parts

This set390

Average set471

Average Mindstorms set: 471 pieces across 33 other sets.

Vs average 1999 set

+105%+200 parts

This set390

Average set190

Average 1999 set: 190 pieces across 144 other sets.

Color profile

11different colors

Dominant color

Light Gray

Light Gray164x

42%

Black149x

38%

Red27x

Yellow12x

Unique parts

3.7 pieces per unique type

105

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🧩105unique parts🎨11different colors📊35.5avg. parts per color🏆20×Technic Bush

🎨 All Mindstorms sets 📅 All sets from 1999

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