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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.

Ariel's Undersea Castle

Checking

10515 Ariel's Undersea Castle

39 pieces in 31 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

Lime 5 pieces

  • Duplo Brick 2 x 4 x 2 Arch Lime Part 11198 Element 6018595 ×1
  • Duplo Plate 2 x 4 Lime Part 40666 Element 4185178 ×4

Medium Azure 5 pieces

  • Duplo Brick Round 4 x 4 Dome Top with 2 x 2 Studs - Marbled Yellowish Green 'Frosting' Medium Azure Part 98220pat0003 Element 6020524 ×1
  • Duplo Building Roof Spire 3 x 3 x 3 Medium Azure Part 16375 Element 6082949 or 6018602 ×2
  • Duplo Cake Swirl Decoration with Top Stud Medium Azure Part 18918 Element 6114695 or 6018607 ×1
  • Duplo Playground Slide Straight with Two Top Studs Medium Azure Part 93150 Element 6102383 or 6018600 ×1

Trans-Light Blue 5 pieces

  • Duplo Brick 1 x 2 x 2 Trans-Light Blue Part 4066 Element 4164500 ×2
  • Duplo Brick 1 x 2 x 2 with Crab Sebastian Print Trans-Light Blue Part 4066pr0265 Element 6093566 or 6027622 ×1
  • Duplo Brick 2 x 2 Trans-Light Blue Part 3437 Element 6507900 or 6201835 ×2

Bright Green 4 pieces

  • Duplo Brick 1 x 2 x 2 Bright Green Part 4066 Element 4519299 or 4162464 ×2
  • Duplo Brick 2 x 2 Bright Green Part 3437 Element 4583789 or 4168579 ×1
  • Duplo Plate 2 x 6 Bright Green Part 98233 Element 4647944 ×1

Dark Pink 4 pieces

  • Duplo Brick 2 x 2 Dark Pink Part 3437 Element 4648234 ×1
  • Duplo Brick 2 x 4 x 2 Arch Dark Pink Part 11198 Element 6020462 ×1
  • Duplo Brick Arch 2 x 8 x 2 with Support Dark Pink Part 62664 Element 4654788 ×1
  • Duplo Cupcake / Muffin Cup with 2 x 2 Studs Dark Pink Part 98215 Element 4654899 ×1

Blue 3 pieces

  • Duplo Brick 2 x 3 x 2 with Curve Blue Part 2301 Element 230123 ×2
  • Duplo Plate 4 x 8 Blue Part 4672 Element 6063473 or 4541331 ×1

Yellow 3 pieces

  • Duplo Animal Fish with Large Eyes and Stripes on Top Print (Flounder / Fabius) Yellow Part 11374pr0001 Element 6476064 or 6303584 ×1
  • Duplo Brick 2 x 2 Yellow Part 3437 Element 4583546 or 343724 ×1
  • Duplo Plant, Flower with 1 Top Stud Yellow Part 6510 Element 4100853 ×1

Bright Pink 2 pieces

  • Duplo Brick 2 x 2 Bright Pink Part 3437 Element 4654353 or 4223919 ×1
  • Duplo Brick 2 x 2 with 3 Shells and Silver Bubbles Print Bright Pink Part 3437pr0066 Element 6020466 ×1

Red 2 pieces

  • Duplo Plant, Flower with 1 Top Stud Red Part 6510 Element 4100774 ×1
  • Duplo Swing Seat Red Part 6514 Element 4255287 or 4255284 ×1

White 2 pieces

  • Duplo Brick 1 x 2 x 2 with Silver Mirror and Gold Frame Print White Part 4066pr0001 Element 6101862 or 6021690 ×1
  • Duplo Dish with Jewelry Print White Part 31333pr0005 Element 6018617 ×1

Green 1 piece

  • Duplo Plant Vine with Leaves and Two End Anti-Studs Green Part 89158 Element 6021037 or 4590614 ×1

Light Nougat 1 piece

  • Duplo Figure with Hair Swept Right Red, Green Mermaid Legs (Ariel) Light Nougat Part 25139c01pr0001 Element 6137858 ×1

Magenta 1 piece

  • Duplo Brick 2 x 2 Magenta Part 3437 Element 4656356 ×1

Pearl Gold 1 piece

  • Duplo Treasure Chest 2 x 4 x 3 Pearl Gold Part 48036 Element 4654906 or 4497161 ×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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