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.

John Hancock Center

Checking

21001 John Hancock Center

69 pieces in 22 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.

Show

Piece checklist

Plates Special 19 pieces

  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×19

Bricks 17 pieces

  • Brick 1 x 3 Black Part 3622 Element 362226 ×7
  • Brick 2 x 3 Black Part 3002 Element 300226 ×7
  • Brick 2 x 4 Black Part 3001 Element 300126 ×3

Plates 13 pieces

  • Plate 1 x 1 Black Part 3024 Element 302426 ×1
  • Plate 1 x 3 Black Part 3623 Element 362326 ×2
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate 2 x 3 Black Part 3021 Element 302126 ×3
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate 4 x 10 Black Part 3030 Element 303076 or 303026 ×2
  • Plate 4 x 6 Light Bluish Gray Part 3032 Element 4211404 ×2
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×1

Tiles 12 pieces

  • Tile 1 x 1 with Groove Black Part 3070b Element 307026 1 spare in the box ×1
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×2
  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×1
  • Tile 1 x 8 with 'John Hancock Center' Print Black Part 4162pr0008 Element 4546191 ×1
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×3
  • Tile 1 x 6 with Groove Light Bluish Gray Part 6636 Element 4211549 ×4

Plates Round Curved and Dishes 5 pieces

  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 1 spare in the box ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Light Bluish Gray Part 4032a Element 4211475 ×3

Bars, Ladders and Fences 2 pieces

  • Antenna 1 x 4 with Rounded Top White Part 3957a ×2

Tiles Round and Curved 1 piece

  • Tile Round 2 x 2 with Bottom Cross Light Bluish Gray Part 4150 Element 4211480 ×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.