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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.

The Skull Arena

Checking

21145 The Skull Arena

192 pieces in 62 part and color combinations, plus 2 minifigures.

The official piece count includes the 6 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

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

Plates 65 pieces

  • Plate 2 x 2 Black Part 3022 Element 302226 Also in Dark Bluish Gray ×1
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×2
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×2
  • Plate 4 x 4 Blue Part 3031 Element 4243815 or 303123 ×2
  • Plate 2 x 2 Dark Bluish Gray Part 3022 Element 4211094 Also in Black ×2
  • Plate 1 x 1 Light Bluish Gray Part 3024 Element 4211399 1 spare in the box ×1
  • Plate 2 x 2 Light Bluish Gray Part 3022 Element 4211397 ×4
  • Plate 6 x 8 Light Bluish Gray Part 3036 Element 4211408 ×1
  • Plate 2 x 2 Lime Part 3022 Element 4613977 or 4537937 ×2
  • Plate 4 x 4 Lime Part 3031 Element 4504850 or 4160080 ×2
  • Plate 2 x 4 Orange Part 3020 Element 4158355 or 4122468 ×2
  • Plate 6 x 12 Orange Part 3028 Element 6223445 or 6010940 ×3
  • Plate 6 x 6 Orange Part 3958 Element 6052391 ×2
  • Plate 1 x 1 Trans-Orange Part 3024 Element 6513961 or 6252040 ×8
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×10
  • Plate 1 x 8 White Part 3460 Element 6550141 or 346001 ×2
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×8
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×3
  • Plate 2 x 8 White Part 3034 Element 6552101 or 303401 ×2
  • Plate 4 x 4 White Part 3031 Element 6552127 or 4243812 ×4
  • Plate 8 x 8 White Part 41539 Element 4624911 or 4529687 ×2

Bricks 43 pieces

  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 Also in Dark Bluish Gray ×2
  • Brick 2 x 2 Dark Bluish Gray Part 3003 Element 4211060 Also in Black ×1
  • Brick 2 x 2 Light Bluish Gray Part 3003 Element 4211387 ×2
  • Brick 2 x 2 Pearl Gold Part 3003 Element 6162889 ×4
  • Brick 1 x 2 x 2 with Inside Stud Holder White Part 3245c Element 6550139 or 4113261 ×2
  • Brick 1 x 2 x 5 with Hollow Studs White Part 2454b Element 6619280 or 245401 ×4
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×4
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×10
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×8
  • Brick 2 x 6 White Part 2456 Element 6552122 or 4249698 ×6

Plates Special 42 pieces

  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Black Part 87580 Element 6663108 or 4565323 ×5
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Green Part 87580 Element 6389692 or 4565321 ×2
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Medium Blue Part 87580 Element 6126060 or 4581079 ×2
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Pearl Gold Part 87580 Element 6186383 or 6107193 ×12
  • Plate Special Round 1 x 1 with Hollow Stud and Bar on Underside Trans-Clear Part 25893 Element 6321083 or 6153264 1 spare in the box ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) White Part 87580 Element 6550157 or 6126046 ×20

Tiles 16 pieces

  • Tile 2 x 2 with Groove Dark Bluish Gray Part 3068b Element 4211055 ×1
  • Tile 2 x 4 with Groove Dark Bluish Gray Part 87079 Element 4560184 ×1
  • Tile 2 x 3 with 8 Silver Squares and Reddish Brown Squares on Dark Brown Background Print Light Bluish Gray Part 26603pr0010 Element 6432167 or 6198008 ×1
  • Tile 1 x 1 with Groove White Part 3070b Element 6550138 or 307001 1 spare in the box ×3
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×7
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×3

Plates Round Curved and Dishes 5 pieces

  • Plate Special 1 x 2 Rounded with 2 Open Studs Black Part 35480 Element 6210270 ×1
  • Plate Round 1 x 1 with Solid Stud Dark Purple Part 6141 Element 4566522 1 spare in the box ×2
  • Plate Round 1 x 1 with Solid Stud Reddish Brown Part 6141 Element 4216581 1 spare in the box ×2

Minifig Shields, Weapons, & Tools 3 pieces

  • Weapon Axe Blocky Pearl Gold Part 18788 Element 6394966 or 6189195 ×1
  • Weapon Sword Blocky Pearl Gold Part 18787 Element 6093621 ×1
  • Weapon Bow and Arrow, Blocky Reddish Brown Part 18792 Element 6089103 ×1

Technic Bricks 3 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Light Bluish Gray Part 3700 Element 4211440 ×3

Bricks Special 2 pieces

  • Brick Special 1 x 1 Studs on 4 Sides White Part 4733 Element 4111971 or 473301 ×1
  • Brick Special 1 x 1 with Headlight White Part 4070 Element 6548267 or 407001 ×1

Containers 2 pieces

  • Treasure Chest Bottom with Rear Slots, with Groove Medium Nougat Part 4738b ×1
  • Treasure Chest Lid [Thick Hinge] Medium Nougat Part 4739a Element 6254218 or 6167286 ×1

Minifig Heads 2 pieces

  • Minifig Head [Plain] [Hollow Stud] Trans-Red Part 3626c Element 6173950 ×2

Panels 2 pieces

  • Panel 1 x 2 x 2 [Side Supports / Hollow Studs] Light Bluish Gray Part 87552 Element 4593679 ×2

Tiles Special 2 pieces

  • Tile Special Round 1 x 1 with Hollow Bar Trans-Clear Part 20482 Element 6507895 or 6186867 1 spare in the box ×2

Animal / Creature Body Parts 1 piece

  • Animal Body Part, Rabbit Head Blocky with Red Eyes, Pink Ears Print White Part 35525pr0003 Element 6227152 ×1

Bars, Ladders and Fences 1 piece

  • Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye Trans-Bright Green Part 58176 Element 6507869 or 6171864 1 spare in the box ×1

Plants & Trees 1 piece

  • Plant, Apple Pearl Gold Part 33051 Element 6186834 ×1

Technic Axles 1 piece

  • Technic Axle 5 with Stop Reddish Brown Part 15462 Element 6159763 ×1

Technic Pins 1 piece

  • Technic Pin 1/2 with 2L Bar Extension Light Bluish Gray Part 61184 Element 6347715 or 4520320 ×1

Minifigures 2 figures

  • Skull Arena Player, Medium Blue Minifigure, checked as a whole figure ×1
  • Skull Arena Player, Dark Bluish Gray Minifigure, checked as a whole figure ×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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