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Robotics Discovery Set

9735-1·LEGO·1999·109 parts

Used Avg

$127.21

New Avg

$224.15

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About Robotics Discovery Set

Robotics Discovery Set (9735-1) is a LEGO LEGO set from 1999 valued at $127.21 on BrickLink. It contains 109 cataloged parts. This set has been retired and is only available on the secondary market.

Seller notes

Sealed copies sell for $224.15 vs $127.21 used — a 76% premium. If you have this set new in sealed box (NISB), price it accordingly.
This is a vintage set (1999). Condition of the box and instructions significantly affects value. A complete set with original box and instructions can sell for well above the average.

Parts (109)

Tile 1 x 4

×4

Wedge, Plate 3 x 3 Cut Corner

×2

Brick 2 x 6

×2

Tile, Modified 1 x 1 with Clip

×4

Brick, Round Corner 4 x 4 Full Brick

×4

Plate, Round 2 x 2 with Rounded Bottom (Boat Stud)

×2

Technic, Brick 1 x 10 with Holes

×4

Technic, Pin with Short Friction Ridges

×13

Technic, Liftarm, Modified Stud Connector Thin 1 x 4

×2

Technic Engine Crankshaft Center

×2

Brick 2 x 4

×10

Brick 2 x 2

×2

Brick 1 x 2

×16

Cylinder Hemisphere 4 x 4 Multifaceted

×2

Bracket 1 x 2 - 4 x 4 Round Dish

×2

Plate 2 x 2

×2

Plate 1 x 2

×14

Wing Insectoid Large with Arm Hinge and Circuitry Pattern Left (Print on Top, Tip on Left, Logo at Back Edge)

Wing Insectoid Large with Arm Hinge and Circuitry Pattern Right (Print on Top, Tip on Right, Logo at Back Edge)

Plate 6 x 10

×2

Slope 45 2 x 1

×4

Tile 2 x 2

×2

Tile 1 x 2

×2

Technic, Brick 1 x 2 with Holes

Technic, Plate 2 x 6 with 5 Holes

×6

Technic, Pin 3/4

×8

Technic, Liftarm, Modified Bent Thick 1 x 11.5 Double

×2

Technic, Axle and Pin Connector Angled #1

×4

Technic, Axle and Pin Connector Angled #6 - 90 degrees

×2

Technic, Axle and Pin Connector Angled #5 - 112.5 degrees

×2

Technic, Axle and Pin Connector Angled #3 - 157.5 degrees

×4

Technic, Liftarm Thin 1 x 5

×4

Plate, Modified 1 x 2 with Door Rail

×4

Technic, Axle Connector with Axle Hole

×4

Technic, Pin 3L with Friction Ridges and Stop Bush

×8

Technic, Axle 2L Notched

×4

Technic, Brick 1 x 2 with Axle Hole and Inside Side Supports

×2

Technic, Axle 5L

×2

Projectile Launcher, Cannon, Round Bottom with (Same Color) Tip and Black Trigger

Mindstorms Scout - Complete Brick

Projectile Arrow, Liftarm Shaft with Solid Black Rubber End

×2

Plate 1 x 8

×2

Wheel with Split Axle Hole

×2

Plate 1 x 3

×4

Tire 17 x 43

×2

Technic, Gear 8 Tooth

×5

Technic, Gear 24 Tooth with 1 Axle Hole

×2

Technic, Gear 40 Tooth

×4

Technic, Gear 24 Tooth Crown - Reinforced

×2

Plate 1 x 6

×2

Technic, Pin without Friction Ridges

×12

Technic, Brick 1 x 2 with Hole

×8

Technic, Brick 1 x 4 with Holes

×4

Technic, Brick 1 x 8 with Holes

×2

Technic, Brick 1 x 16 with Holes

×6

Technic, Axle 4L

×2

Technic, Axle 6L

×2

Technic, Axle 8L

×2

Technic, Axle 12L

×2

Technic, Plate 2 x 4 with 3 Holes

×4

Technic, Plate 2 x 4 with 3 Holes

×2

Plate 1 x 4

×2

Plate 1 x 4

×4

Plate 1 x 4

×6

Technic Bush

×20

Technic, Axle 10L

×2

Technic, Plate 2 x 8 with 7 Holes

×6

Slope, Inverted 33 3 x 2 with Flat Bottom Pin without Connections between Studs

×2

Technic, Axle 1L with Pin without Friction Ridges with Round Hole

×8

Plate 2 x 10

×2

Technic, Brick 1 x 6 with Holes

×8

Technic, Brick 1 x 12 with Holes

×2

Hinge Brick 1 x 2 Base

×2

Hinge Brick 1 x 2 Top Plate

×2

Brick, Round 2 x 2 with Axle Hole

×4

Dish 4 x 4 Inverted (Radar) with Solid Stud

×2

Technic, Gear 16 Tooth - Axle Hole with Open Sides

×2

Plate, Round 2 x 2 with Axle Hole

×2

Plate, Round 1 x 1

×3

Plate, Round 1 x 1

×3

Tile 1 x 8

×2

Technic Bush 1/2 Smooth

×8

Technic, Pin 1/2 without Friction Ridges

×4

Slope 33 3 x 1

×2

Plate 1 x 10

×2

Technic, Axle 3L

×2

Dish 2 x 2 Inverted (Radar)

×2

Electric, Wire with Brick 2 x 2 x 2/3 Ends 20L

×2

Electric, Wire with Brick 2 x 2 x 2/3 Ends 36L

×2

Arm Piece with Pin, 2 Fingers and Finger Grooves

×2

Technic, Gear 24 Tooth Clutch

×2

Technic, Axle and Pin Connector Perpendicular

×6

Technic, Axle Connector 2L (Ridged with x Hole x Orientation)

×4

Technic, Brick 1 x 1 with Hole

×4

Technic, Axle 2L with Reverser Handle Axle Connector

×2

Technic, Pin 3L with Friction Ridges

×2

Technic Cam

×2

Tire 20 x 30 Balloon Medium

×2

Wheel 20 x 30 Balloon Medium

×2

Technic, Axle 3L with Stud

×2

Technic, Liftarm, Modified Bent Thick 1 x 9 (6 - 4)

×2

Technic, Liftarm Thin 1 x 3 - Axle Holes

×4

Electric, Motor 9V Mini-Motor, Heavier Weight

×2

Hose, Rigid 3mm D. 16L / 12.8cm

×2

Hose, Rigid 3mm D. 37L / 29.6cm

×2

Hose, Rigid 3mm D. 45L / 36.0cm

×2

Electric Sensor, Touch

×2

Foam Part for Sets 9730 and 9735 - Ball 41mm D.

×2

Rubber Band Small (Square Cross Section)

×6

Common questions about Robotics Discovery Set

How much is LEGO Robotics Discovery Set (9735-1) worth?

Robotics Discovery Set sells for an average of $127.21 used and $224.15 new/sealed on BrickLink based on 6 months of completed sales. As a retired set, prices tend to hold steady or appreciate over time, especially for complete sets with original packaging. Actual prices vary with completeness — missing minifigures or key parts will lower the value.

Is LEGO Robotics Discovery Set (9735-1) retired?

Yes, Robotics Discovery Set was released in 1999 and has been retired from retail for several years. Retired LEGO sets are only available on the secondary market through BrickLink, eBay, or other resale platforms. At its current price point, it has appreciated since retirement.

How do I check if my Robotics Discovery Set set is complete?

Use the parts list on this page to check every piece. For the minifigures specifically, you can use the brick'em scanner to identify each figure from a photo and confirm it matches what should be in this set. Missing pieces can be individually sourced on BrickLink.

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