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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.

Monster 4

Checking

3837 Monster 4

142 pieces in 43 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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

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Piece checklist

Bricks Round and Cones 29 pieces

  • Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder Black Part 30367b Element 4158779 ×1
  • Cone 1 x 1 [Top Groove] Black Part 59900 Element 4529236 ×8
  • Cone 1 x 1 [Top Groove] Green Part 59900 Element 4529239 ×4
  • Cone 1 x 1 [Top Groove] Orange Part 59900 Element 4518029 ×4
  • Cone 1 x 1 [Top Groove] Red Part 59900 Element 4529234 ×4
  • Cone 1 x 1 [Top Groove] Reddish Brown Part 59900 Element 4529242 ×4
  • Cone 1 x 1 [Top Groove] White Part 59900 Element 6601844 or 4518400 ×4

Tiles 26 pieces

  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 Also in Dark Bluish Gray ×1
  • Tile 1 x 2 with Groove Dark Bluish Gray Part 3069b Element 4211052 ×1
  • Tile 2 x 2 with Groove Dark Bluish Gray Part 3068b Element 4211055 Also in Black ×9
  • Tile 1 x 1 with Groove Green Part 3070b Element 4558593 or 4238528 1 spare in the box ×1
  • Tile 1 x 2 with Groove Light Bluish Gray Part 3069b Element 4211414 ×1
  • Tile 2 x 2 with Groove Light Bluish Gray Part 3068b Element 4211413 ×9
  • Tile 1 x 1 with Groove Orange Part 3070b Element 4558595 or 4277770 1 spare in the box ×1
  • Tile 1 x 1 with Groove Red Part 3070b Element 307021 1 spare in the box ×1
  • Tile 1 x 1 with Groove Reddish Brown Part 3070b Element 4211288 1 spare in the box ×1
  • Tile 2 x 2 with Groove White Part 3068b Element 6548263 or 306801 ×1

Minifig Heads 20 pieces

  • Minifig Head Pumpkin, Jack-o-Lantern, Vertical Lines Print Orange Part 3626bpr0609 Element 4558585 ×4
  • Minifig Head Devil, Yellow Eyes, Horns Print [Blocked Open Stud] Red Part 3626bpr0611 Element 4558587 ×4
  • Minifig Head Werewolf, White Deep Set Eyes, Fangs, Light Brown Fur Print [Blocked Open Stud] Reddish Brown Part 3626bpr0608 Element 4558582 ×4
  • Minifig Head Troll / Orc, Red Eyes and Lower Fangs Print Sand Green Part 3626bpr0511 Element 4519598 ×4
  • Minifig Head Skeleton, Skull, Evil with Scowl Black Print, Red Eyes Print [Blocked Open Stud] White Part 3626bpr0494 Element 4506829 ×4

Plates Special 19 pieces

  • Plate Special 1 x 2 Side Handle [Free Ends] Black Part 2540 Element 4140588 or 254026 ×2
  • Plate Special 3 x 2 with Rounded End, Hole Black Part 3176 Element 317676 or 317626 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Dark Bluish Gray Part 3794b Element 4211119 ×8
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Light Bluish Gray Part 3794b ×8

Bricks 18 pieces

  • Brick 1 x 6 Black Part 3009 Element 300926 ×2
  • Brick 1 x 2 Dark Bluish Gray Part 3004 Element 4211088 ×8
  • Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×8

Plates 8 pieces

  • Plate 4 x 8 Green Part 3035 Element 4277361 ×2
  • Plate 6 x 8 Green Part 3036 Element 4507311 or 303678 ×4
  • Plate 2 x 8 Reddish Brown Part 3034 Element 4211211 ×2

Bars, Ladders and Fences 6 pieces

  • Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Black Part 48729b Element 6278152 or 6037347 1 spare in the box ×6

Plates Wedged 4 pieces

  • Wedge Plate 3 x 3 Cut Corner Dark Bluish Gray Part 2450 Element 4210897 ×2
  • Wedge Plate 3 x 3 Cut Corner Light Bluish Gray Part 2450 Element 4211361 ×2

Bricks Special 3 pieces

  • Brick Special 1 x 1 with Clip Vertical [Thick U Clip, Solid Stud] Black Part 60475a Element 4515356 ×2
  • Die - 6 Sided Rubber Frame with Red Centre Studs (Board Games) Black Part 64776pat0001 Element 4539364 ×1

Plates Round Curved and Dishes 3 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×1
  • Plate Round 1 x 1 with Open Stud White Part 85861 Element 6168642 or 4547649 1 spare in the box ×2

Bricks Sloped 2 pieces

  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×2

Energy Effects 2 pieces

  • Wave / Flame Rounded with Base Pegs Trans-Neon Orange Part 6126a ×2

Bricks Curved 1 piece

  • Brick Arch 1 x 4 Black Part 3659 Element 365926 ×1

Minifig Shields, Weapons, & Tools 1 piece

  • Tool Screwdriver and Spanner / Wrench Black Part 4006 Element 6034000 or 4569095 ×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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