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.

Cosmic Wonder

Checking

41903 Cosmic Wonder

33 pieces in 9 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

Tiles Round and Curved 26 pieces

  • Tile Round 1 x 1 Quarter Bright Light Yellow Part 25269 Element 6554798 or 6228969 1 spare in the box ×4
  • Tile Round 1 x 1 Quarter Bright Pink Part 25269 Element 6240463 1 spare in the box ×4
  • Tile Round 1 x 1 Quarter with Yellow Stars, Pink Shooting Stars Print Dark Turquoise Part 25269pr0008 Element 6299225 1 spare in the box ×4
  • Tile Round 1 x 1 Quarter with Yellow Stars/Dots, Pink/Lavender Curved Lines Print Dark Turquoise Part 25269pr0009 Element 6299160 1 spare in the box ×4
  • Tile Round 1 x 1 Quarter Lavender Part 25269 Element 6240465 1 spare in the box ×4
  • Tile Round 1 x 1 Quarter Light Aqua Part 25269 Element 6199886 1 spare in the box ×4
  • Tile Round 1 x 1 with Planet, Rings Print Light Aqua Part 98138pr0150 Element 6322973 1 spare in the box ×2

Rock 6 pieces

  • Plate Special 8-Sided Crystal/Gem 1 x 1 x 2/3 Opal Trans-Clear Part 65092 Element 6514349 or 6287309 1 spare in the box ×6

Tools 1 piece

  • DOTS Bracelet 2 Stud Wide Black Part 66821 Element 6290292 ×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.