BlockTalk Find Your Set

Free tool

LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

ROBOLAB Amusement Park Set

Checking

9725-3 ROBOLAB Amusement Park Set

284 pieces in 94 part and color combinations, plus 5 minifigures.

The piece count includes the 22 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

Show

Piece checklist

Technic Pins 44 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×12
  • Technic Pin 3/4 Dark Bluish Gray Part 32002 Element 32002199 or 4211050 1 spare in the box ×8
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×4
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 ×12
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×8

Technic Bushes 28 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×20
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×8

Technic Bricks 26 pieces

  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Green Part 32064a Element 6206248 or 4233489 ×4
  • Technic Brick 1 x 12 [11 Pin Holes] Red Part 3895 Element 389521 ×4
  • Technic Brick 1 x 16 [15 Pin Holes] Red Part 3703 Element 370321 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Red Part 3701 Element 370121 ×4
  • Technic Brick 1 x 6 [5 Pin Holes] Red Part 3894 Element 389421 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×4

Plates Special 22 pieces

  • Bracket 2 x 2 - 2 x 2 Blue Part 3956 Element 6019215 or 395623 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Blue Part 3794a ×4
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] Blue Part 2444 Element 4529003 or 244423 ×4
  • Technic Plate 2 x 4 [3 Holes] Blue Part 3709 Element 370923 ×4
  • Technic Plate 2 x 8 [7 Holes] Blue Part 3738 Element 373823 ×4
  • Plate Special 1 x 2 with Door Rail Light Bluish Gray Part 32028 Element 4211568 ×4

Technic Axles 21 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×3
  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×4
  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Axle 3 with Stud Dark Bluish Gray Part 6587 Element 6587199 or 6129590 ×2
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×2
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×2

Technic Gears 20 pieces

  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×2
  • Technic Gear 12 Tooth Bevel Light Bluish Gray Part 6589 Element 6589194 or 4565450 ×4
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Bluish Gray Part 4019 Element 4562487 or 4211563 ×2
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Bluish Gray Part 3650c Element 4211434 ×2
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Light Bluish Gray Part 3648b Element 4211565 ×2
  • Technic Gear 40 Tooth Light Bluish Gray Part 3649 Element 6195314 or 4285634 ×1
  • Technic Gear 8 Tooth Light Bluish Gray Part 3647 Element 4211432 or 3647194 ×3
  • Technic Gear Rack 1 x 4 Light Bluish Gray Part 3743 Element 6457283 or 4211450 ×4

Wheels and Tyres 20 pieces

  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×2
  • Tyre 30 x 10.5 Offset Tread Black Part 2346 Element 234676 or 234626 ×2
  • Tyre 43 x 17 Black Part 3634 Element 4523564 or 363426 ×2
  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×2
  • Wheel with Split Axle hole Yellow Part 3482 Element 348224 ×10

Plates 16 pieces

  • Plate 1 x 10 Blue Part 4477 Element 447723 ×4
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×6
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×2
  • Plate 1 x 8 Blue Part 3460 Element 346023 ×2
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×2

Electronics 14 pieces

  • Wire with Brick 2 x 2 x 2/3 Pair, 11L Black Part 5306bc011 ×2
  • Wire with Brick 2 x 2 x 2/3 Pair, 17L Black Part 5306bc017 ×2
  • Wire with Brick 2 x 2 x 2/3 Pair, 33L Black Part 5306bc033 ×2
  • Sensor, Light with Fixed Cable Blue Part 2982c01 Element 4119421 ×1
  • Motor Pulley, 9V Micromotor with axle hole Light Bluish Gray Part 2983 Element 4493377 ×2
  • Motor, 9V Mini [Lightweight New Style] Light Bluish Gray Part 43362c01 Element 4274900 ×2
  • Sensor, Touch Light Bluish Gray Part 879 Element 4492694 ×2
  • Light Brick 1 x 2 with Single Side Light White Part 6035 Element 4603220 or 74880 ×1

Technic Beams 12 pieces

  • Technic Beam 1 x 3 Thin Light Bluish Gray Part 6632 Element 6360043 or 4211566 ×2
  • Technic Beam 1 x 4 Thin with Stud Connector Light Bluish Gray Part 2825 Element 6331574 or 4211561 ×2
  • Technic Beam 1 x 5 Thin Light Bluish Gray Part 32017 Element 4503416 or 4211554 ×8

Technic Connectors 11 pieces

  • Technic Axle and Pin Connector Angled #1 Blue Part 32013 Element 6332570 or 4107797 ×2
  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Bluish Gray Part 6553 Element 4211536 ×2
  • Technic Axle Connector Ridged [with x Hole x Orientation] Light Bluish Gray Part 6538b Element 4211543 ×2
  • Technic Axle Connector with Axle Hole Light Bluish Gray Part 32039 Element 4211553 ×2
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×3

Tiles 10 pieces

  • Tile 1 x 2 with Groove Blue Part 3069b Element 306923 ×1
  • Tile 1 x 4 with Groove Blue Part 2431 Element 243123 ×2
  • Tile 2 x 2 with Groove Blue Part 3068b Element 306823 ×1
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×1
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×1
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×1
  • Tile 2 x 2 with Groove White Part 3068b Element 6548263 or 306801 ×1
  • Tile 1 x 2 with Groove Yellow Part 3069b Element 306924 ×1
  • Tile 2 x 2 with Groove Yellow Part 3068b Element 6388487 or 306824 ×1

String, Bands and Reels 7 pieces

  • Rubber Band Small 13mm (Square Cross Section) Black Part 71509 Element 4141606 or 4107153 ×4
  • Technic Rubber Belt Medium [26mm ID] [Round Cross Section] Blue Part 85545 Element 6049730 or 4544147 ×1
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×2

Technic Special 7 pieces

  • Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle Hole Blue Part 32124 Element 6280384 or 4112874 ×2
  • Technic Plate Rotor 3 Blade with Smooth Ends and 6 Studs (Propeller) Blue Part 32125 Element 4112875 ×2
  • Technic Cam Dark Bluish Gray Part 6575 Element 6575199 or 4210759 ×2
  • Technic Gearbox 2 x 4 x 3 1/3 Yellow Part 6588 Element 658824 ×1

Bricks 6 pieces

  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×4
  • Brick 2 x 4 Red Part 3001 Element 300121 ×2

Plates Round Curved and Dishes 6 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×2
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×2

Bricks Sloped 4 pieces

  • Brick Sloped 45° 2 x 1 with Bottom Pin Red Part 3040b Element 4121934 or 304021 ×4

Gear Parts 3 pieces

  • Storage Bin, Dacta, Small Black Part upn0032 ×1
  • Storage / Sorting Tray, Dacta, 34 Compartment for Dacta Small Bin Trans-Clear Part 997251 ×1
  • Storage Bin Lid, Dacta, 19 x 24 Trans-Clear Part 71082 ×1

Bricks Round and Cones 2 pieces

  • Brick Round 2 x 2 with Axle Hole Red Part 3941 Element 614321 or 394121 ×2

Technic Steering, Suspension and Engine 2 pieces

  • Technic Engine Crankshaft Center Dark Bluish Gray Part 2854 Element 6007058 or 4210987 ×2

Baseplates 1 piece

  • Baseplate 16 x 32 Green Part 3857 Element 4219615 or 274828 ×1

Minifig Headwear 1 piece

  • Costume Ghost Shroud Glow In Dark Opaque Part 2588 Element 258850 ×1

Panels 1 piece

  • Panel 2 x 5 x 6 Wall with Window Stones and 2 Columns Print Black Part 4444pr0008 Element 82339 ×1

Minifigures 5 figures

  • White Torso, Red Legs, Black Hair Minifigure, checked as a whole figure ×1
  • Skeleton, Standard Face, Ball Joint Arms (3626b Head) Minifigure, checked as a whole figure ×1
  • Man, White Tank Top with Windsurfer, Blue Legs, Blue Cap, Moustache Minifigure, checked as a whole figure ×1
  • Woman, Red Torso, White Legs, Black Hair Minifigure, checked as a whole figure ×1
  • Woman, Blue Torso, Black Legs, Medium Brown Hair Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy