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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.

Level One - Kit 2, Microbuild Designer

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20201 Level One - Kit 2, Microbuild Designer

222 pieces in 68 part and color combinations.

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

Light Bluish Gray 57 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Light Bluish Gray Part 54200 Element 4521921 or 4244372 1 spare in the box ×2
  • Brick Sloped 45° 2 x 2 Double Convex Light Bluish Gray Part 3045 Element 4216250 ×4
  • Brick Sloped Inverted 33° 3 x 1 with Internal Stopper and No Front Stud Connection Light Bluish Gray Part 4287c Element 4211489 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Light Bluish Gray Part 3660 Element 4211436 ×1
  • Plate 1 x 1 Light Bluish Gray Part 3024 Element 4211399 ×8
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×5
  • Plate 1 x 6 Light Bluish Gray Part 3666 Element 4211438 ×1
  • Plate 2 x 2 Light Bluish Gray Part 3022 Element 4211397 ×5
  • Plate 2 x 4 Light Bluish Gray Part 3020 Element 4211395 ×1
  • Plate 6 x 12 Light Bluish Gray Part 3028 Element 4211400 ×2
  • Plate 6 x 8 Light Bluish Gray Part 3036 Element 4211408 ×1
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Light Bluish Gray Part 4081b Element 6281998 or 4632575 ×4
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Light Bluish Gray Part 60478 Element 4515369 ×2
  • Plate Special 1 x 2, Top Clip [Split] Light Bluish Gray Part 92280 Element 4598526 ×2
  • Tap 1 x 1 without Hole in Spout Light Bluish Gray Part 4599b Element 4211503 ×3
  • Tile 1 x 2 with Groove Light Bluish Gray Part 3069b Element 4211414 ×1
  • Tile 1 x 8 with Groove Light Bluish Gray Part 4162 Element 4211481 ×1
  • Tile 2 x 4 with Groove Light Bluish Gray Part 87079 Element 4560183 ×12

Lime 37 pieces

  • Brick Curved 3 x 1 No Studs Lime Part 50950 Element 4537928 ×3
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Lime Part 54200 Element 4504372 or 4298015 1 spare in the box ×10
  • Plate 1 x 2 Lime Part 3023 Element 4164037 or 4122439 ×1
  • Plate 1 x 4 Lime Part 3710 Element 4187743 or 4122441 ×3
  • Plate 1 x 8 Lime Part 3460 Element 6392872 or 4271565 ×3
  • Plate 4 x 4 Lime Part 3031 Element 4504850 or 4160080 ×1
  • Tile 1 x 1 with Groove Lime Part 3070b Element 4537251 1 spare in the box ×13
  • Tile 1 x 2 with Groove Lime Part 3069b Element 4500125 or 4164025 ×2
  • Tile 1 x 4 with Groove Lime Part 2431 Element 4164021 ×1

Trans-Dark Blue 30 pieces

  • Plate 1 x 1 Trans-Dark Blue Part 3024 Element 6513965 or 6252044 ×4
  • Plate 1 x 2 Trans-Dark Blue Part 3023 Element 6514004 or 6240215 ×26

White 30 pieces

  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×1
  • Brick Curved 1 x 4 x 1 1/3 No Studs, Lowered Inside Support White Part 6191 Element 4297949 or 619101 ×2
  • Brick Sloped 65° 2 x 1 x 2 White Part 60481 Element 6552132 or 4515370 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] White Part 3660 Element 366001 ×1
  • Brick Special 1 x 1 Studs on 4 Sides White Part 4733 Element 4111971 or 473301 ×1
  • Hat / Cap Short Curved Peak White Part 86035 Element 4567912 ×1
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×7
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×1
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×1
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×2
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×1
  • Plate Round Corner 3 x 3 White Part 30357 Element 6550165 or 4550745 ×2
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] White Part 4081b Element 6281990 or 4632566 ×2
  • Plate Special 1 x 1 with Tooth White Part 49668 Element 6601935 or 4224792 ×2
  • Tail Shuttle - Small White Part 44661 Element 6253365 or 4288960 ×1
  • Wedge Plate 2 x 4 White Part 51739 Element 6552128 or 4249506 ×1
  • Wedge Plate 4 x 2 Left White Part 41770 Element 6552119 or 4161326 ×1
  • Wedge Plate 4 x 2 Right White Part 41769 Element 6552118 or 4160857 ×1

Black 27 pieces

  • Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder Black Part 30367b Element 4158779 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Black Part 54200 Element 4504382 or 4287159 1 spare in the box ×4
  • Dish 2 x 2 Inverted [Radar] Black Part 4740 Element 474026 ×2
  • Equipment Magnifying Glass with Thin Frame, Hollow Handle, Trans-Clear Lens Pattern Black Part 30152pat0001 Element 4114128 ×1
  • Lever Small Base with Black Lever Black Part 298c02 Element 73587 1 spare in the box ×2
  • Panel 1 x 2 x 1 [Square Corners] Black Part 4865a Element 486526 ×2
  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 1 spare in the box ×12
  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×2

Trans-Red 13 pieces

  • Tile 1 x 1 with Groove Trans-Red Part 3070b Element 6581817 or 6254248 1 spare in the box ×13

Dark Purple 9 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Dark Purple Part 54200 Element 4567509 or 4255409 1 spare in the box ×2
  • Plate 2 x 3 Dark Purple Part 3021 Element 4225142 ×1
  • Plate Round 1 x 1 with Solid Stud Dark Purple Part 6141 Element 4566522 1 spare in the box ×6

Trans-Light Blue 9 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Light Blue Part 6141 Element 6514058 or 6240225 1 spare in the box ×9

Green 5 pieces

  • Plate 1 x 2 Green Part 3023 Element 302328 ×1
  • Plate 1 x 3 Green Part 3623 Element 4107758 or 362328 ×1
  • Plate 1 x 4 Green Part 3710 Element 371028 ×1
  • Tile 1 x 1 with Groove Green Part 3070b Element 4558593 or 4238528 1 spare in the box ×1
  • Tile 1 x 2 with Groove Green Part 3069b Element 306928 ×1

Metallic Silver 4 pieces

  • Antenna 1 x 4 with Rounded Top Metallic Silver Part 3957a Element 4579837 ×2
  • Cone 1 x 1 [Top Groove] Metallic Silver Part 59900 Element 6051385 or 4529351 ×2

Trans-Brown 1 piece

  • Brick Curved 2 x 2 with Lip, No Studs Trans-Brown Part 30602 Element 6507872 or 6171717 ×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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