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.

Chain Reactions

Checking

5005629 Chain Reactions

40 pieces in 17 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

Red 12 pieces

  • Projectile, Large Figure Weapon, Zamor Sphere / Ball Red Part 54821 Element 4545430 ×6
  • Technic Brick 1 x 12 [11 Pin Holes] Red Part 3895 Element 389521 ×6

Light Bluish Gray 10 pieces

  • Brick Special 2 x 2 with 2 Pins and Axle Hole Light Bluish Gray Part 30000 Element 6356172 or 4211752 ×5
  • Technic Axle and Pin Connector Angled #1 Light Bluish Gray Part 32013 Element 6296859 or 4211550 ×1
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 ×4

Black 7 pieces

  • String Cord Thin (0.5mm) 200cm Black Part 56823c200 Element 4276325 or 71162 ×1
  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Plate 2 x 6 [5 Holes] Black Part 32001 Element 3200126 ×2
  • Tyre 30.4 x 14 Offset Tread [Centre Band] Black Part 92402 Element 4619323 ×1

Tan 3 pieces

  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×3

Yellow 3 pieces

  • Brick 2 x 8 Yellow Part 3007 Element 4639693 or 300724 ×2
  • Wheel 18 x 14 with Pin Hole, Fake Bolts and Shallow Spokes Yellow Part 55981 Element 6109681 or 4490142 ×1

Dark Bluish Gray 2 pieces

  • Technic Axle 5.5 with Stop [Flat Short End] Dark Bluish Gray Part 32209 Element 4263624 ×2

White 2 pieces

  • Brick Sloped Inverted 34° 3 x 1 with Internal Stopper White Part 4287b ×1
  • Technic Axle and Pin Connector Angled #2 - 180° White Part 32034 Element 6271870 or 4125554 ×1

Blue 1 piece

  • Technic Brick 1 x 2 [1 Pin Hole] Blue Part 3700 Element 370023 ×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.