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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.

Window Exploration Bag

Checking

2000409-2 Window Exploration Bag

5,200 pieces in 32 part and color combinations, plus 100 minifigures.

The piece count includes the 300 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.

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Piece checklist

Bricks 1,800 pieces

  • Brick 1 x 4 Blue Part 3010 Element 301023 ×200
  • Brick 1 x 2 Dark Bluish Gray Part 3004 Element 4211088 ×200
  • Brick 1 x 4 Dark Pink Part 3010 Element 4621542 or 4245308 ×200
  • Brick 1 x 2 Green Part 3004 Element 4107736 or 300428 ×200
  • Brick 1 x 4 Green Part 3010 Element 4112838 or 301028 ×200
  • Brick 2 x 2 Green Part 3003 Element 300328 ×100
  • Brick 2 x 4 Green Part 3001 Element 4106356 or 300128 ×100
  • Brick 1 x 2 Lime Part 3004 Element 4613965 or 4164022 ×200
  • Brick 1 x 4 Red Part 3010 Element 301021 ×200
  • Brick 1 x 2 without Bottom Tube Trans-Red Part 3065 Element 6514263 or 6244905 ×200

Bricks Sloped 700 pieces

  • Brick Sloped 33° 3 x 1 Dark Bluish Gray Part 4286 Element 4211045 ×200
  • Brick Sloped Inverted 33° 3 x 1 with Internal Stopper and No Front Stud Connection Dark Bluish Gray Part 4287c Element 4211068 ×200
  • Brick Sloped 45° 2 x 1 with Bottom Pin Orange Part 3040b Element 4121967 or 4118901 ×200
  • Brick Sloped 45° 2 x 2 Trans-Clear Part 3039 Element 6514100 or 6244886 ×100

Plates 700 pieces

  • Plate 4 x 6 Black Part 3032 Element 303226 ×100
  • Plate 2 x 3 Orange Part 3021 Element 4125278 ×100
  • Plate 2 x 4 Orange Part 3020 Element 4158355 or 4122468 ×100
  • Plate 1 x 10 Tan Part 4477 Element 4143409 or 447705 ×200
  • Plate 2 x 6 Yellow Part 3795 Element 379524 ×200

Bricks Special 400 pieces

  • Brick Special 1 x 2 with Pin - Bottom Stud Holder Dark Bluish Gray Part 44865 Element 6321769 ×100
  • Brick Special 1 x 1 with Stud on 1 Side White Part 87087 Element 6550190 or 4558952 ×300

Bricks Curved 300 pieces

  • Brick Arch 1 x 4 Light Bluish Gray Part 3659 Element 4211435 ×200
  • Brick Curved 2 x 3 Yellow Part 6215 Element 621524 ×100

Tiles Round and Curved 300 pieces

  • Tile Round 1 x 1 with Offset Black Eye Print White Part 98138pr0008 Element 6284599 or 6029156 ×300

Bars, Ladders and Fences 200 pieces

  • Antenna 1 x 4 with Flat Top Black Part 3957b Element 395726 100 spares in the box ×200

Flags, Banners and Signs 200 pieces

  • Flag 4 x 1 Wavy [First Wave Right] Green Part 4495b Element 6268947 or 449528 ×200

Plants & Trees 200 pieces

  • Plant, Flower 2 x 2 Leaves - Angular Bright Green Part 4727 Element 4143562 ×100
  • Plant, Flower, Minifig Accessory with 7 Thick Petals and Pin Dark Pink Part 32606 Element 6206151 100 spares in the box ×100

Bricks Round and Cones 100 pieces

  • Brick Round 2 x 2 with Axle Hole Trans-Yellow Part 3941 Element 6514285 or 6273155 ×100

Plates Special 100 pieces

  • Plate Special 1 x 2 with Ladder Dark Bluish Gray Part 4175 Element 6285244 or 6179567 ×100

Tiles Special 100 pieces

  • Tile Special 2 x 2 with Top Pin [Squared Holes] Dark Bluish Gray Part 49153 Element 6313189 ×100

Transportation - Sea and Air 100 pieces

  • Propeller 4 Blade 5 Diameter with Rounded Ends, Closed Hub Black Part 67737 Element 6324143 ×100

Minifigures 100 figures

  • Woman, Blue Torso with White Arms, White Legs, Peach Lips Minifigure, checked as a whole figure ×100

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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