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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

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9725 ROBOLAB Amusement Park Set

248 pieces in 82 part and color combinations.

LEGO counts 301 pieces. This inventory comes from a separate parts catalog and lists 248; the two do not always count the same elements, so their totals differ. 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.

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Piece checklist

Technic Pins 44 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×12
  • Technic Pin 3/4 Dark Gray Part 32002 Element 4109854 1 spare in the box ×8
  • Technic Pin 1/2 without Friction Ridges Light Gray Part 4274 Element 427402 1 spare in the box ×4
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×12
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×8

Technic Bushes 28 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 1 spare in the box ×20
  • Technic Bush 1/2 Smooth with Axle Hole Reduced Light Gray Part 32123a 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

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 Gray Part 6587 Element 4113884 or 658727 ×2
  • Technic Axle 3 Light Gray Part 4519 Element 4186007 ×2
  • Technic Axle 5 Light Gray Part 32073 Element 4141482 ×2

Plates Special 18 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

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, 15L Black Part 5306bc015 Element 75565 ×2
  • Wire with Brick 2 x 2 x 2/3 Pair, 20L Black Part 5306bc020 Element 4100355 ×2
  • Wire with Brick 2 x 2 x 2/3 Pair, 36L Black Part 5306bc036 Element 75652 ×2
  • Sensor, Light with Fixed Cable Blue Part 2982c01 Element 4119421 ×1
  • Motor Pulley, 9V Micromotor with axle hole Light Gray Part 2983 Element 298630 ×2
  • Motor, 9V Mini [Lightweight New Style] Light Gray Part 43362c01 Element 4176779 ×2
  • Sensor, Touch Light Gray Part 879 Element 4247135 or 4209116 ×2
  • Light Brick 1 x 2 with Single Side Light White Part 6035 Element 4603220 or 74880 ×1

Technic Gears 14 pieces

  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×2
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Gray Part 3650c Element 365002 ×2
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Light Gray Part 3648b Element 4107543 or 364802 ×2
  • Technic Gear 40 Tooth Light Gray Part 3649 Element 364902 ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×3
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×4

Technic Beams 10 pieces

  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×2
  • Technic Beam 1 x 5 Thin Light Gray Part 32017 Element 4106885 ×8

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 Connectors 7 pieces

  • Technic Axle Connector Ridged [with x Hole x Orientation] Light Gray Part 6538b Element 4113804 or 4100408 ×2
  • Technic Axle Connector with Axle Hole Light Gray Part 32039 Element 4106469 ×2
  • Technic Axle and Pin Connector Perpendicular Light Gray Part 6536 Element 4173667 or 653602 ×3

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 Gray Part 6575 Element 4157379 ×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

Wheels and Tyres 6 pieces

  • Tyre 43 x 17 Black Part 3634 Element 4523564 or 363426 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×2
  • Wheel with Split Axle hole Yellow Part 3482 Element 348224 8 spares in the box ×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

Plates Round Curved and Dishes 2 pieces

  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×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

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.

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