Robotics Discovery Set (9735-1) is a RCX LEGO set released in 1999 with 390 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing RCX sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 109 unique part types.
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Buying checklist
Quick context before you buy this set used or verify a marketplace listing.
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Release year
1999 (27 years ago — may be retired)
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Catalog scale
390 parts listed · 109 inventory lines tracked
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Minifigures
No minifigs in inventory (brick-only or Technic set)
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Build manual
No digital manual in our catalog — check the box tab or LEGO.com
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Gray era
Pre-2004 set — may use old light/dark gray instead of bluish gray
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Shipping weight (est.)
~766 g for parts inventory (excludes box/minifig packaging)
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Before you buy used
Run the completion checker, compare photos to the inventory, and check live listings for sealed pricing
Related sets in this theme
![Vision Command [RCX Digital Colour Camera]](https://cdn.rebrickable.com/media/sets/9731-1.jpg)
Market value
No estimate on BrickID yet
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Parts in this set
109 parts · page 1 of 3 · updating…
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Arm Piece with Pin, 2 Fingers6048a · ×2 · Black -
Ball 41mm72048 · ×2 · Yellow -
Brick 1 x 23004 · ×16 · Blue -
Brick 2 x 23003 · ×2 · Blue -
Brick 2 x 43001 · ×10 · Blue -
Brick 2 x 62456 · ×2 · Blue -
Brick Round 2 x 2 with Axle Hole3941 · ×4 · Blue -
Brick Round Corner 4 x 4 Full Brick2577 · ×4 · Blue -
Brick Sloped 33° 3 x 14286 · ×2 · Yellow -
Brick Sloped 45° 2 x 1 with Bottom Pin3040b · ×4 · Light Gray -
Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin3747b · ×2 · Blue -
![Dish 2 x 2 Inverted [Radar]](https://cdn.rebrickable.com/media/parts/elements/474001.jpg)
Dish 2 x 2 Inverted [Radar]4740 · ×2 · White -
![Dish 4 x 4 Inverted [Radar]](https://cdn.rebrickable.com/media/parts/elements/396001.jpg)
Dish 4 x 4 Inverted [Radar]3960 · ×2 · White -
Dome Hemisphere 4 x 4 Multifaceted30208 · ×2 · Trans-Neon Green -
Hinge Brick 1 x 2 Base3937 · ×2 · Black -
Hinge Brick 1 x 2 Top Plate Thin3938 · ×2 · Black -
Hose Rigid 3mm D. 16L / 12.8cm75c16 · ×2 · Yellow -
Hose Rigid 3mm D. 36L / 28.8cm75c36 · ×2 · Dark Turquoise -
Hose Rigid 3mm D. 44L / 35.2cm75c44 · ×2 · Yellow -
![Hub, Scout Brick [Complete Assembly]](https://cdn.rebrickable.com/media/parts/ldraw/1/32104c01.png)
Hub, Scout Brick [Complete Assembly]32104c01 · ×1 · Blue -
Launcher, Technic Competition Cannon, Round Bottom with Black Ends32074c02 · ×1 · Dark Turquoise -
![Motor, 9V Mini [Old Style]](https://cdn.rebrickable.com/media/parts/ldraw/7/71427.png)
Motor, 9V Mini [Old Style]71427c01 · ×2 · Light Gray -
Plate 1 x 104477 · ×2 · Light Gray -
Plate 1 x 23023 · ×14 · Light Gray -
Plate 1 x 33623 · ×4 · Light Gray -
Plate 1 x 43710 · ×2 · Yellow -
Plate 1 x 43710 · ×6 · Dark Turquoise -
Plate 1 x 43710 · ×4 · Light Gray -
Plate 1 x 63666 · ×2 · Light Gray -
Plate 1 x 83460 · ×2 · Light Gray -
Plate 2 x 103832 · ×2 · Light Gray -
Plate 2 x 23022 · ×2 · Light Gray -
Plate 6 x 103033 · ×2 · Light Gray -
Plate Round 1 x 1 with Solid Stud6141 · ×3 · Blue -
Plate Round 1 x 1 with Solid Stud6141 · ×3 · Light Gray -
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)4032a · ×2 · White -
![Plate Round 2 x 2 with Rounded Bottom [Boat Stud]](https://cdn.rebrickable.com/media/parts/elements/265426.jpg)
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]2654 · ×2 · Black -
Plate Special 1 x 2 with 4 x 4 disk at 90 degrees30209 · ×2 · Blue -
Plate Special 1 x 2 with Door Rail32028 · ×4 · Light Gray -
Projectile, Technic Competition Arrow, Beam Shaft with Solid Black Rubber End76110c01 · ×2 · Yellow -
Rubber Band Small 13mm (Square Cross Section)71509 · ×4 · Black -
Sensor, Touch879 · ×2 · Light Gray -
Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle)6553 · ×2 · Light Gray -
Technic Axle 103737 · ×2 · Black -
Technic Axle 123708 · ×2 · Black -
Technic Axle 2 Notched32062 · ×4 · Black -
Technic Axle 34519 · ×2 · Black -
Technic Axle 3 with Stud6587 · ×2 · Dark Gray