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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 Sky Tower

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21173 The Sky Tower

558 pieces in 157 part and color combinations, plus 1 minifigure.

The official piece count includes the 7 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

Black 112 pieces

  • Bracket 1 x 2 - 2 x 2 Inverted Black Part 99207 Element 6000650 ×4
  • Brick 1 x 1 Black Part 3005 Element 300526 ×2
  • Brick 1 x 1 x 3 Black Part 14716 Element 6065496 ×14
  • Brick 1 x 1 x 5 with Solid Stud Black Part 2453b Element 4566308 or 4144539 ×1
  • Brick 1 x 2 Black Part 3004 Element 300426 ×1
  • Brick 1 x 3 Black Part 3622 Element 362226 ×6
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 Also in Dark Bluish Gray ×2
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×4
  • Brick 2 x 2 x 3 Black Part 30145 Element 4113241 ×1
  • Brick Special 1 x 1 with Handle Black Part 2921 Element 6170566 or 292126 ×12
  • Panel 1 x 2 x 1 [Rounded Corners] Black Part 4865b Element 6146220 ×1
  • Panel 1 x 2 x 1 with Rounded Corners and 2 Sides Black Part 23969 Element 6248496 or 6174845 ×2
  • Plate 1 x 1 Black Part 3024 Element 302426 ×5
  • Plate 1 x 2 Black Part 3023 Element 302326 ×1
  • Plate 1 x 5 Black Part 78329 Element 6350415 ×4
  • Plate 2 x 2 Black Part 3022 Element 302226 Also in Dark Bluish Gray ×10
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×4
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate 6 x 6 Black Part 3958 Element 395826 ×1
  • Plate Round 1 x 1 with Open Stud Black Part 85861 Element 6168646 or 6100627 ×1
  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 ×20
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×6
  • Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×4
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Black Part 87580 Element 6663108 or 4565323 ×4
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 Also in Dark Blue ×1

Dark Turquoise 103 pieces

  • Brick 1 x 1 Dark Turquoise Part 3005 Element 6236772 or 6213776 ×5
  • Brick 1 x 2 Dark Turquoise Part 3004 Element 6217659 or 4121500 ×2
  • Brick 1 x 8 Dark Turquoise Part 3008 Element 6289133 ×4
  • Brick 2 x 2 Dark Turquoise Part 3003 Element 6314091 or 4120399 ×16
  • Brick 2 x 4 Dark Turquoise Part 3001 Element 6249422 or 6235115 ×7
  • Plate 1 x 2 Dark Turquoise Part 3023 Element 6213777 or 4218493 ×16
  • Plate 1 x 4 Dark Turquoise Part 3710 Element 6350418 or 4121705 ×4
  • Plate 1 x 8 Dark Turquoise Part 3460 Element 6259921 ×4
  • Plate 2 x 10 Dark Turquoise Part 3832 Element 6249538 ×2
  • Plate 2 x 2 Dark Turquoise Part 3022 Element 6249390 or 4170141 ×8
  • Plate 2 x 3 Dark Turquoise Part 3021 Element 6249417 or 4121834 ×10
  • Plate 2 x 4 Dark Turquoise Part 3020 Element 6338181 or 4121501 ×4
  • Plate 2 x 6 Dark Turquoise Part 3795 Element 6259794 or 4121503 ×11
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Dark Turquoise Part 4032a Element 6210400 ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Dark Turquoise Part 87580 Element 6290269 ×5
  • Tile 1 x 2 with Groove Dark Turquoise Part 3069b Element 6213779 or 4164140 ×2
  • Tile 2 x 4 with Groove Dark Turquoise Part 87079 Element 6223065 ×2

Tan 75 pieces

  • Brick 1 x 2 Tan Part 3004 Element 4109995 or 300405 ×3
  • Brick 1 x 2 x 2 with Inside Stud Holder Tan Part 3245c Element 4159279 ×4
  • Brick 1 x 6 Tan Part 3009 Element 4112982 or 300905 ×3
  • Brick 2 x 2 Tan Part 3003 Element 4114306 or 300305 ×20
  • Brick 2 x 4 Tan Part 3001 Element 4114319 or 300105 ×1
  • Brick 2 x 6 Tan Part 2456 Element 4181134 or 4143256 ×8
  • Hinge Brick 1 x 4 [Upper] Tan Part 3830 Element 6364438 or 6334214 ×1
  • Plate 1 x 2 Tan Part 3023 Element 4113917 or 302305 Also in Dark Tan ×2
  • Plate 2 x 3 Tan Part 3021 Element 4118790 or 302105 ×8
  • Plate 2 x 6 Tan Part 3795 Element 4113993 or 379505 ×2
  • Plate 6 x 10 Tan Part 3033 Element 4624185 or 4218966 ×1
  • Plate 6 x 6 Tan Part 3958 Element 4125217 ×2
  • Plate Round 1 x 1 with Solid Stud Tan Part 6141 Element 4161734 or 614105 ×6
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Tan Part 87580 Element 4565387 Also in Dark Tan ×6
  • Plate Special 2 x 4 with Groove and Two Center Studs (Jumper) Tan Part 65509 Element 6294227 ×6
  • Tile 1 x 2 with Groove Tan Part 3069b Element 4114026 ×2

Light Bluish Gray 48 pieces

  • Brick 1 x 1 Light Bluish Gray Part 3005 Element 4211389 ×4
  • Brick 1 x 12 Light Bluish Gray Part 6112 Element 4211522 ×2
  • Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×1
  • Brick 1 x 4 Light Bluish Gray Part 3010 Element 4211394 ×1
  • Brick 1 x 8 Light Bluish Gray Part 3008 Element 4211392 ×1
  • Brick 2 x 2 Light Bluish Gray Part 3003 Element 4211387 ×4
  • Brick 2 x 2 Corner Light Bluish Gray Part 2357 Element 4211349 ×6
  • Brick 2 x 4 Light Bluish Gray Part 3001 Element 4211385 ×5
  • Brick 2 x 6 Light Bluish Gray Part 2456 Element 4274668 or 4211795 ×3
  • Brick Special 1 x 1 with Handle Light Bluish Gray Part 2921 Element 6170569 or 4225532 ×1
  • Hinge Brick 1 x 4 [Lower] Light Bluish Gray Part 3831 Element 4211461 ×1
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×1
  • Plate 2 x 3 Light Bluish Gray Part 3021 Element 4211396 ×2
  • Plate Round 1 x 1 with Open Stud Light Bluish Gray Part 85861 Element 6168647 or 6124825 ×4
  • Plate Special 1 x 2 5.9mm Towball Socket Light Bluish Gray Part 14418 Element 6414556 or 6338163 ×2
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Light Bluish Gray Part 87580 Element 6126082 or 4565393 ×8
  • Tile 1 x 2 with Groove Light Bluish Gray Part 3069b Element 4211414 ×1
  • Tile 1 x 4 with Groove Light Bluish Gray Part 2431 Element 4211356 or 2431194 ×1

Green 38 pieces

  • Bracket 1 x 2 - 1 x 2 Inverted Green Part 99780 Element 6099243 ×1
  • Bracket 1 x 2 - 2 x 2 Green Part 44728 Element 6117971 or 6048853 ×1
  • Plate 1 x 2 Green Part 3023 Element 302328 ×1
  • Plate 2 x 2 Corner Green Part 2420 Element 4157120 or 242028 ×26
  • Plate 4 x 6 Green Part 3032 Element 4116671 ×1
  • Plate 6 x 6 Green Part 3958 Element 6097194 or 4626001 ×1
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Green Part 2654 Element 6144145 or 4558618 ×1
  • Plate Special 1 x 2 [Side Handle Closed Ends] Green Part 48336 Element 4521931 ×1
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Green Part 60470b Element 6347288 or 4556159 ×1
  • Tile 1 x 1 with Groove Green Part 3070b Element 4558593 or 4238528 ×4

Dark Bluish Gray 29 pieces

  • Bar 2L with Stop in Center Dark Bluish Gray Part 78258 Element 6350724 ×1
  • Brick 1 x 2 with Pixelated Lit Forge Print Dark Bluish Gray Part 3004pr0020 Element 6216862 ×1
  • Brick 2 x 2 Dark Bluish Gray Part 3003 Element 4211060 Also in Black ×2
  • Brick 2 x 3 Dark Bluish Gray Part 3002 Element 4211105 ×2
  • Brick Special 2 x 2 with Grooves and Axle Hole Dark Bluish Gray Part 90258 Element 6236949 or 4583879 ×5
  • Plate 1 x 4 Dark Bluish Gray Part 3710 Element 4211001 ×2
  • Plate 2 x 2 Dark Bluish Gray Part 3022 Element 4211094 Also in Black ×6
  • Plate 6 x 8 Dark Bluish Gray Part 3036 Element 4210794 ×4
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Dark Bluish Gray Part 15573 Element 6092572 ×2
  • Plate Special 1 x 2 with 5.9mm Centre Side Towball Dark Bluish Gray Part 14417 Element 6414560 or 6338160 ×2
  • Plate Special 1 x 2 with 5.9mm Towball Socket and Towball Dark Bluish Gray Part 14419 Element 6414554 or 6338166 ×2

Reddish Brown 25 pieces

  • Bracket 2 x 2 with 1 x 2 Vertical Studs Reddish Brown Part 41682 Element 6290983 ×1
  • Brick 1 x 4 Reddish Brown Part 3010 Element 4211225 ×6
  • Brick 1 x 6 Reddish Brown Part 3009 Element 4211193 ×2
  • Brick 2 x 2 Corner Reddish Brown Part 2357 Element 4211200 ×4
  • Brick 2 x 4 Reddish Brown Part 3001 Element 4211201 ×2
  • Brick 2 x 6 Reddish Brown Part 2456 Element 4286200 or 4216615 ×2
  • Container Box 2 x 2 x 2 - Top Opening Reddish Brown Part 61780 Element 4520638 ×1
  • Plate 1 x 1 Reddish Brown Part 3024 Element 4221744 ×2
  • Plate 1 x 4 Reddish Brown Part 3710 Element 4211190 ×2
  • Plate 6 x 6 Reddish Brown Part 3958 Element 4217848 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Reddish Brown Part 15573 Element 6092590 ×2

White 23 pieces

  • Bracket 2 x 2 with 1 x 2 Vertical Studs White Part 41682 Element 6615545 or 6250019 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×4
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×1
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×4
  • Plate 4 x 6 White Part 3032 Element 303201 ×4
  • Plate 6 x 6 White Part 3958 Element 6552116 or 4144012 ×1
  • Plate 6 x 8 White Part 3036 Element 303651 or 303601 ×2
  • Plate Round 1 x 1 with Open Stud White Part 85861 Element 6168642 or 4547649 ×2
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 ×2
  • Tile 1 x 1 with Groove White Part 3070b Element 6550138 or 307001 ×1

Bright Green 18 pieces

  • Plant, Flower, Plate Round 1 x 1 with 5 Petals Bright Green Part 24866 Element 6526150 or 6206150 ×10
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Bright Green Part 87580 Element 6389695 or 4565388 ×8

Trans-Clear 17 pieces

  • Bar 1 x 12 with 1 x 2 Plate End with Solid Studs and 1 x 1 Round Plate End Trans-Clear Part 42445 Element 6276993 or 4169199 ×2
  • Brick 2 x 2 without Inside Ridges Trans-Clear Part 6223 Element 6514093 or 6239418 ×7
  • Plate 1 x 1 Trans-Clear Part 3024 Element 6513962 or 6252041 ×2
  • Windscreen 2 x 4 x 2 Vertical Trans-Clear Part 4594 Element 6507908 or 6240532 ×6

Dark Tan 14 pieces

  • Bracket 1 x 2 - 1 x 2 Inverted Dark Tan Part 99780 Element 6250168 ×4
  • Plate 1 x 2 Dark Tan Part 3023 Element 4528604 or 4497082 Also in Tan ×5
  • Plate Special 1 x 2 with Door Rail Dark Tan Part 32028 Element 4616711 or 4267875 ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Dark Tan Part 87580 Element 6126075 or 4578032 Also in Tan ×4

Dark Blue 12 pieces

  • Bracket 1 x 2 - 1 x 2 Dark Blue Part 99781 Element 6554220 or 6350417 ×2
  • Tile 1 x 2 with Groove Dark Blue Part 3069b Element 6554190 or 4528488 Also in Black ×2
  • Tile 1 x 2 with Pixelated Face / Lime/Green Squares Print Dark Blue Part 3069bpr0333 Element 6468458 or 6347326 ×2
  • Tile 2 x 3 Dark Blue Part 26603 Element 6186974 ×2
  • Tile Special 2 x 3 with 2 Clips without Tab between Clips Dark Blue Part 65886 Element 6331690 ×4

Dark Green 10 pieces

  • Plate 1 x 2 Dark Green Part 3023 Element 6618076 or 6013797 ×1
  • Plate 1 x 6 Dark Green Part 3666 Element 6618082 or 4245566 ×2
  • Plate 2 x 4 Dark Green Part 3020 Element 6618075 or 4586057 ×2
  • Plate 2 x 8 Dark Green Part 3034 Element 6174940 or 4271444 ×5

Bright Light Orange 7 pieces

  • Animal Body Part, Cat Head 1 x 2 with Cube with Ears, Nose and Pixelated Face with Green Eyes and Dark Pink Nose Print (Cat) Bright Light Orange Part 24008pr0005 Element 6347327 ×1
  • Plate 1 x 1 Bright Light Orange Part 3024 Element 6073040 or 6028740 ×3
  • Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip] Bright Light Orange Part 61252 Element 6536604 or 6360108 ×1
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Bright Light Orange Part 60478 Element 6248671 or 6097507 ×1
  • Tile 1 x 3 Bright Light Orange Part 63864 Element 6099725 ×1

Trans-Dark Blue 7 pieces

  • Brick 2 x 2 without Inside Ridges Trans-Dark Blue Part 6223 Element 6514091 or 6238043 ×3
  • Brick Sloped 45° 2 x 2 Trans-Dark Blue Part 3039 Element 6514101 or 6244887 ×1
  • Plate 1 x 2 Trans-Dark Blue Part 3023 Element 6514004 or 6240215 ×1
  • Tile 1 x 4 with Groove Trans-Dark Blue Part 2431 Element 6510179 or 6252050 ×2

Sand Green 5 pieces

  • Plate Special 1 x 2 with Door Rail Sand Green Part 32028 Element 6222362 or 6057585 ×4
  • Weapon Trident, Blocky Sand Green Part 78801 Element 6347366 ×1

Dark Pink 4 pieces

  • Plate Round 1 x 1 with Solid Stud Dark Pink Part 6141 Element 6195315 or 4243576 ×4

Medium Nougat 3 pieces

  • Brick 1 x 2 with Reddish Brown and Dark Brown Lines Print Medium Nougat Part 3004pr0014 Element 6097024 ×2
  • Tile 2 x 2 with Dark Brown Minecraft Grid Print (Crafting Table) Medium Nougat Part 3068bpr0236 Element 6097003 ×1

Red 3 pieces

  • Brick Sloped 45° 1 x 1 x 2/3 Quadruple Convex [Pyramid] Red Part 22388 Element 6350414 ×1
  • Plate Round 1 x 1 with Open Stud Red Part 85861 Element 6223427 ×2

Trans-Light Blue 2 pieces

  • Plate 1 x 1 Trans-Light Blue Part 3024 Element 6513964 or 6252043 ×2

Blue 1 piece

  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×1

Lime 1 piece

  • Bracket 1 x 2 - 1 x 2 Lime Part 99781 Element 6310279 ×1

Orange 1 piece

  • Animal, Fish [Hollow Stud Mouth] Orange Part 64648 Element 4623481 ×1

Minifigures 1 figure

  • Pilot 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.

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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.

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