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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.

Mutation Monster

Checking

MUTATIONMONSTER Mutation Monster

77 pieces in 35 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

Green 19 pieces

  • Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip] Green Part 3484 Element 6541878 ×2
  • Bracket 1 x 2 - 1 x 2 Green Part 99781 Element 6493699 ×2
  • Brick 1 x 2 Green Part 3004 Element 4107736 or 300428 ×2
  • Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no stud Green Part 28192 Element 6529283 ×2
  • Plate 2 x 4 Green Part 3020 Element 302028 ×3
  • Plate Special 1 x 1 x 2/3 Half Round with Side Stud Green Part 3386 Element 6493351 ×2
  • Plate Special 1 x 2 Rounded with 2 Open Studs Green Part 35480 Element 6210271 ×4
  • Plate Special 1 x 2 [Side Handle Closed Ends] Green Part 48336 Element 4521931 ×1
  • Plate Special Round 1 x 2 Half Circle with Stud (Jumper) Green Part 1745 Element 6510059 or 6424859 ×1

Lime 14 pieces

  • Animal Body Part / Plant, Tail / Trunk / Tentacle / Tongue / Vine / Tree Branch (Long Tip) Lime Part 80497 Element 6382563 ×4
  • Brick Curved 2 x 2 x 2/3 Lime Part 15068 Element 6138661 ×1
  • Dish 4 x 4 with 4 Studs Lime Part 65138 Element 6468077 ×1
  • Plate 1 x 2 Lime Part 3023 Element 4164037 or 4122439 ×2
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Lime Part 4081b Element 6281999 or 4632576 ×4
  • Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] Lime Part 21459 Element 6372804 or 6254417 ×2

Yellowish Green 13 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Yellowish Green Part 53451 Element 6275487 or 6109556 ×10
  • Plate Round 1 x 1 with Open Stud Yellowish Green Part 85861 Element 6256092 ×3

Reddish Brown 11 pieces

  • Bar 4L (Lightsaber Blade / Wand) Reddish Brown Part 30374 Element 6116613 or 4262974 ×2
  • Bracket 1 x 2 - 1 x 4 [Rounded Corners at Bottom, Square Corners at Top] Reddish Brown Part 28802 Element 6168623 ×1
  • Brick Curved Inverted 2 x 1 Reddish Brown Part 24201 Element 6172922 ×2
  • Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no stud Reddish Brown Part 28192 Element 6248854 ×2
  • Hinge Brick 1 x 2 Base Reddish Brown Part 3937 Element 6186045 or 4541234 ×1
  • Plate 1 x 6 Reddish Brown Part 3666 Element 4221590 ×1
  • Plate Special 1 x 4 Rounded with 2 Open Studs Reddish Brown Part 77845 Element 6463591 ×2

Trans-Bright Green 5 pieces

  • Dome 1 x 1 x 2/3 Trans-Bright Green Part 6908 Element 6527409 ×5

Black 4 pieces

  • Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no stud Black Part 28192 Element 6267487 ×2
  • Hinge Brick 2 x 2 Top Plate Thin Black Part 6134 Element 4124096 or 613426 ×1
  • Plate Special 1 x 2 with 2 End Towballs Black Part 3170 Element 6416838 ×1

Dark Bluish Gray 3 pieces

  • Plate Round 4 x 4 with Pin Hole Dark Bluish Gray Part 60474 Element 4528323 ×1
  • Plate Special 1 x 2 with 5.9mm Towball Socket and Towball Dark Bluish Gray Part 14419 Element 6414554 or 6338166 ×2

Light Bluish Gray 3 pieces

  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×2
  • Plate Special 1 x 2 Rounded with 2 Open Studs Light Bluish Gray Part 35480 Element 6248890 ×1

Yellow 3 pieces

  • Tile Round 1 x 1 with Black Animal Eye Print Yellow Part 98138pr0364 Element 6434207 ×3

Dark Tan 2 pieces

  • Plate Special 1 x 2 Rounded with 2 Open Studs Dark Tan Part 35480 Element 6231386 ×1
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Dark Tan Part 60470b Element 6474324 ×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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