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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 Ocean Monument

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21136 The Ocean Monument

1,114 pieces in 189 part and color combinations, plus 2 minifigures.

The official piece count includes the 8 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

Bricks 395 pieces

  • Brick 1 x 1 Blue Part 3005 Element 300523 ×4
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×3
  • Brick 2 x 3 Blue Part 3002 Element 300223 ×4
  • Brick 2 x 2 Dark Blue Part 3003 Element 4296785 or 4264580 ×1
  • Brick 1 x 12 Dark Bluish Gray Part 6112 Element 4210798 ×4
  • Brick 1 x 2 Dark Bluish Gray Part 3004 Element 4211088 ×2
  • Brick 1 x 8 Dark Bluish Gray Part 3008 Element 4211099 ×2
  • Brick 2 x 2 with Light Bluish Gray and Black Pixelated Furnace Print Dark Bluish Gray Part 3003pr0035 Element 6097032 ×1
  • Brick 2 x 3 Dark Bluish Gray Part 3002 Element 4211105 ×4
  • Brick 1 x 1 Dark Green Part 3005 Element 6618073 or 4521915 ×16
  • Brick 1 x 2 Dark Green Part 3004 Element 6618072 or 4245570 ×15
  • Brick 1 x 4 Dark Green Part 3010 Element 6618074 or 4245571 ×9
  • Brick 2 x 4 Dark Green Part 3001 Element 4260493 ×21
  • Brick 1 x 2 Light Aqua Part 3004 Element 6022032 Also in Sand Green ×16
  • Brick 1 x 3 Light Bluish Gray Part 3622 Element 4211428 ×4
  • Brick 1 x 4 Light Bluish Gray Part 3010 Element 4211394 ×1
  • Brick 2 x 10 Light Bluish Gray Part 3006 Element 4617862 or 4211390 ×1
  • Brick 2 x 2 Light Bluish Gray Part 3003 Element 4211387 ×13
  • Brick 2 x 2 Corner Light Bluish Gray Part 2357 Element 4211349 ×2
  • Brick 2 x 4 Light Bluish Gray Part 3001 Element 4211385 ×16
  • Brick 2 x 6 Light Bluish Gray Part 2456 Element 4274668 or 4211795 ×3
  • Brick 1 x 1 Sand Green Part 3005 Element 4521948 or 4517507 ×26
  • Brick 1 x 2 Sand Green Part 3004 Element 4642425 or 4623925 Also in Light Aqua ×55
  • Brick 1 x 2 x 2 with Inside Stud Holder Sand Green Part 3245c Element 6075623 ×4
  • Brick 1 x 2 x 5 with Hollow Studs Sand Green Part 2454b Element 6075621 ×6
  • Brick 1 x 4 Sand Green Part 3010 Element 4521947 or 4517505 ×26
  • Brick 1 x 6 Sand Green Part 3009 Element 6177081 or 6009665 ×61
  • Brick 2 x 2 Sand Green Part 3003 Element 6075624 or 4642424 ×54
  • Brick 2 x 4 Sand Green Part 3001 Element 6075626 or 4642412 ×8
  • Brick 2 x 4 Tan Part 3001 Element 4114319 or 300105 ×4
  • Brick 2 x 6 Tan Part 2456 Element 4181134 or 4143256 ×2
  • Brick 2 x 2 without Inside Ridges Trans-Dark Blue Part 6223 Element 6514091 or 6238043 ×6
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×1

Plates 355 pieces

  • Plate 1 x 4 Black Part 3710 Element 371026 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×6
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×4
  • Plate 2 x 12 Blue Part 2445 Element 244523 ×2
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×4
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×5
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×2
  • Plate 2 x 8 Blue Part 3034 Element 303423 ×4
  • Plate 4 x 4 Blue Part 3031 Element 4243815 or 303123 ×2
  • Plate 4 x 6 Blue Part 3032 Element 303223 ×2
  • Plate 6 x 6 Blue Part 3958 Element 4199519 or 395823 ×11
  • Plate 2 x 3 Dark Blue Part 3021 Element 6554192 or 4530028 ×1
  • Plate 1 x 2 Dark Bluish Gray Part 3023 Element 4211063 ×2
  • Plate 4 x 4 Dark Bluish Gray Part 3031 Element 4243831 or 4211089 ×1
  • Plate 6 x 12 Dark Bluish Gray Part 3028 Element 4256149 or 4210657 ×1
  • Plate 1 x 1 Dark Green Part 3024 Element 6618077 or 6055169 ×10
  • Plate 1 x 2 Dark Green Part 3023 Element 6618076 or 6013797 ×51
  • Plate 1 x 3 Dark Green Part 3623 Element 6618081 or 6013975 ×6
  • Plate 1 x 4 Dark Green Part 3710 Element 6618083 or 6020923 ×20
  • Plate 1 x 6 Dark Green Part 3666 Element 6618082 or 4245566 ×16
  • Plate 2 x 3 Dark Green Part 3021 Element 6013801 or 4650244 ×30
  • Plate 2 x 4 Dark Green Part 3020 Element 6618075 or 4586057 ×12
  • Plate 2 x 8 Dark Green Part 3034 Element 6174940 or 4271444 ×38
  • Plate 6 x 6 Dark Green Part 3958 Element 6302995 or 6186831 ×15
  • Plate 1 x 4 Dark Tan Part 3710 Element 4626904 or 4497088 Also in Tan ×1
  • Plate 2 x 3 Dark Tan Part 3021 Element 6035540 or 6015192 ×1
  • Plate 2 x 2 Green Part 3022 Element 302228 ×2
  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×2
  • Plate 2 x 10 Light Bluish Gray Part 3832 Element 4211462 ×2
  • Plate 2 x 2 Light Bluish Gray Part 3022 Element 4211397 ×1
  • Plate 2 x 4 Light Bluish Gray Part 3020 Element 4211395 ×4
  • Plate 4 x 6 Light Bluish Gray Part 3032 Element 4211404 ×1
  • Plate 1 x 2 Orange Part 3023 Element 4177932 or 4163009 ×2
  • Plate 2 x 2 Pearl Gold Part 3022 Element 6347982 or 6162885 ×24
  • Plate 1 x 2 Sand Green Part 3023 Element 4655080 or 4642428 ×5
  • Plate 1 x 4 Sand Green Part 3710 Element 6100234 or 4642417 ×4
  • Plate 2 x 2 Sand Green Part 3022 Element 6186823 or 6001196 ×11
  • Plate 2 x 3 Sand Green Part 3021 Element 6184348 or 4642415 ×2
  • Plate 2 x 6 Sand Green Part 3795 Element 6194726 or 4642411 ×4
  • Plate 1 x 1 Tan Part 3024 Element 4159553 or 302405 ×2
  • Plate 1 x 2 Tan Part 3023 Element 4113917 or 302305 ×2
  • Plate 1 x 3 Tan Part 3623 Element 4121921 or 362305 ×10
  • Plate 1 x 4 Tan Part 3710 Element 4113233 or 371005 Also in Dark Tan ×4
  • Plate 1 x 6 Tan Part 3666 Element 4124067 or 366605 ×2
  • Plate 2 x 4 Tan Part 3020 Element 4114309 or 302005 ×2
  • Plate 3 x 3 Cross Tan Part 15397 Element 6061575 ×1
  • Plate 1 x 1 Trans-Orange Part 3024 Element 6513961 or 6252040 ×2
  • Plate 1 x 1 Trans-Yellow Part 3024 Element 6513966 or 6252045 Also in Yellow ×2
  • Plate 1 x 1 Yellow Part 3024 Element 302424 Also in Trans-Yellow ×12
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×3

Plates Special 128 pieces

  • Bracket 1 x 2 - 2 x 2 Black Part 44728 Element 6117973 or 6048855 ×2
  • Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip] Black Part 61252 Element 6308000 or 4517925 ×2
  • Plate Special 1 x 2 with Clip Horizontal on Side Black Part 11476 Element 6313116 or 6132731 ×2
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Black Part 60478 Element 4515368 ×4
  • Plate Special 1 x 2 with Pin Hole on Top Black Part 11458 Element 6114987 ×2
  • Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Solid Anti-stud] Black Part 99206 Element 6052126 ×4
  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Blue Part 15573 Element 6092582 ×1
  • Plate Special 1 x 2 with Door Rail Blue Part 32028 Element 6179330 or 4286617 ×2
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Blue Part 60478 Element 6073890 ×12
  • Plate Special 3 x 2 with Rounded End, Hole Blue Part 3176 Element 317673 or 317623 ×2
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Dark Bluish Gray Part 15573 Element 6092572 ×4
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Dark Bluish Gray Part 87580 Element 6126083 or 4565322 ×8
  • Plate Special 1 x 2 Side Handle [Free Ends] Green Part 2540 Element 4542391 or 4519974 ×12
  • Bracket 1 x 2 - 2 x 2 Inverted Light Bluish Gray Part 99207 Element 4654580 ×4
  • Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Light Bluish Gray Part 60897 Element 6296894 or 4613956 ×2
  • Plate Special 1 x 2 with Clip Horizontal on Side Light Bluish Gray Part 11476 Element 6313114 or 6028812 ×1
  • Plate Special 1 x 2 with Handles on Ends Light Bluish Gray Part 18649 Element 6093058 ×1
  • Plate Special 1 x 2 with Pin Hole Underneath Light Bluish Gray Part 18677 Element 6168633 or 6089147 ×1
  • Plate Special 1 x 2, Top Clip [Split] Light Bluish Gray Part 92280 Element 4598526 ×10
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Light Bluish Gray Part 87580 Element 6126082 or 4565393 ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Pearl Gold Part 87580 Element 6186383 or 6107193 ×8
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Sand Green Part 87580 Element 6186826 ×32
  • Plate Special 1 x 2 Side Handle [Free Ends] Tan Part 2540 Element 4140593 or 4125271 ×1
  • Plate Special 1 x 4 with 2 Studs, 3 Bottom Tubes Tan Part 92593 Element 6173056 ×1
  • Bracket 1 x 2 - 1 x 4 [Rounded Corners] White Part 10201 Element 6089574 ×4
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Yellow Part 15573 Element 6092583 ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Yellow Part 87580 Element 6126050 or 4565386 ×3

Tiles 84 pieces

  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1
  • Tile 1 x 2 with Groove Dark Blue Part 3069b Element 6554190 or 4528488 ×4
  • Tile 2 x 3 with Pixelated Squid Face Print Dark Blue Part 26603pr0004 Element 6481439 or 6192742 ×1
  • Tile 1 x 6 with Groove Dark Bluish Gray Part 6636 Element 4210651 ×3
  • Tile 1 x 3 Dark Green Part 63864 Element 6618112 or 4650622 ×8
  • Tile 1 x 4 with Groove Dark Green Part 2431 Element 4543949 or 4248267 ×2
  • Tile 2 x 2 with Groove Dark Green Part 3068b Element 6618078 or 4528778 ×17
  • Tile 1 x 1 with Groove Dark Tan Part 3070b Element 6055172 ×1
  • Tile 1 x 3 Dark Tan Part 63864 Element 6015452 ×5
  • Tile 1 x 2 with Groove Lavender Part 3069b Element 6345796 or 6112962 ×12
  • Tile 2 x 2 with Groove Light Aqua Part 3068b Element 6192270 ×16
  • Tile 1 x 2 with Groove Sand Green Part 3069b Element 4616578 or 4504803 ×2
  • Tile 2 x 4 with Groove Sand Green Part 87079 Element 4633693 ×2
  • Tile 2 x 3 Tan Part 26603 Element 6175367 ×3
  • Tile 2 x 3 with Pixelated Orange Eye Print Tan Part 26603pr0005 Element 6600961 or 6299721 ×1
  • Tile 1 x 2 with Groove Trans-Dark Blue Part 3069b Element 6514219 or 6251289 ×6

Bricks Sloped 28 pieces

  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Blue Part 3660 Element 366023 ×5
  • Brick Sloped Inverted 45° 2 x 1 Dark Bluish Gray Part 3665 Element 4211096 ×2
  • Brick Sloped 30° 1 x 2 x 2/3 Dark Green Part 85984 Element 6618117 or 6168574 ×3
  • Brick Sloped 45° 2 x 1 with Bottom Pin Dark Green Part 3040b Element 4255624 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Sand Green Part 54200 Element 4652205 ×7
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Tan Part 54200 Element 4516055 or 4278069 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Dark Blue Part 54200 Element 6245256 or 4244366 ×4
  • Brick Sloped 45° 2 x 2 Trans-Dark Blue Part 3039 Element 6514101 or 6244887 ×2
  • Brick Sloped 45° 1 x 1 x 2/3 Quadruple Convex [Pyramid] Trans-Light Blue Part 22388 Element 6581705 or 6313366 ×1

Plates Round Curved and Dishes 27 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×1
  • Plate Round 1 x 1 with Solid Stud Blue Part 6141 Element 614123 ×11
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Blue Part 4032a Element 403223 ×2
  • Plate Round 1 x 1 with Solid Stud Dark Bluish Gray Part 6141 Element 4210633 ×4
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Green Part 4032a Element 403228 ×2
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Bluish Gray Part 2654 Element 4278273 or 4276273 ×1
  • Plate Round 1 x 1 with Solid Stud Reddish Brown Part 6141 Element 4216581 ×2
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 ×1
  • Plate Round 1 x 1 with Solid Stud Yellow Part 6141 Element 614124 ×3

Bricks Special 23 pieces

  • Brick Special 2 x 2 with Grooves and Axle Hole Dark Bluish Gray Part 90258 Element 6236949 or 4583879 ×2
  • Brick Special 1 x 1 with Stud on 1 Side Dark Green Part 87087 Element 6055222 ×4
  • Brick Special 1 x 2 with 2 Studs on 1 Side Light Bluish Gray Part 11211 Element 6015344 ×4
  • Brick Special 1 x 2 with Vertical Closed Handle Inset from Edge Light Bluish Gray Part 26597 Element 6156663 ×1
  • Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side Light Bluish Gray Part 22885 Element 6123809 ×1
  • Brick Special 1 x 1 x 1 2/3 with Studs on 1 Side Red Part 32952 Element 6187620 ×3
  • Brick Special 1 x 1 with Studs on 2 Adjacent Sides Tan Part 26604 Element 6175968 ×4
  • Brick Special 1 x 1 with Stud on 1 Side White Part 87087 Element 6550190 or 4558952 ×4

Bars, Ladders and Fences 13 pieces

  • Bar Holder with Clip Orange Part 11090 Element 6390029 or 6162893 ×12
  • Bar 1 x 12 with 1 x 2 Plate End with Hollow Studs and 1 x 1 Round Plate End Trans-Clear Part 99784 Element 6010687 ×1

Hinges, Arms and Turntables 12 pieces

  • Hinge Brick 1 x 4 [Lower] Dark Bluish Gray Part 3831 Element 4210795 ×4
  • Hinge Brick 1 x 4 [Upper] Dark Bluish Gray Part 3830 Element 6327414 or 6011461 ×4
  • Hinge Plate 1 x 2 Locking with 2 Fingers on Side, 9 Teeth Light Bluish Gray Part 60471 Element 4515341 ×2
  • Hinge Plate 2 x 4 with Pin Hole with 3 Holes - Top Light Bluish Gray Part 98286 Element 4646513 ×2

Technic Pins 7 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 ×5
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×1

Plates Wedged 6 pieces

  • Wedge Plate 2 x 4 Black Part 51739 Element 4531412 ×1
  • Wedge Plate 4 x 2 Left Blue Part 41770 Element 6430083 or 4161330 ×4
  • Wedge Plate 2 x 4 Orange Part 51739 Element 6025385 ×1

Tiles Special 6 pieces

  • Tile Special Round 2 x 2 with Hole Dark Bluish Gray Part 15535 Element 6055313 ×1
  • Tile Special 1 x 1 with Clip with Rounded Edges Sand Green Part 15712 Element 6348059 or 6125669 ×1
  • Tile Special 2 x 2 Inverted with Pixelated Dark Green, Dark Red, White and Gray Print (Minecraft Guardian) Sand Green Part 11203pr0002 Element 6600960 or 6192760 ×1
  • Tile Special Round 1 x 1 with Hollow Bar Trans-Clear Part 20482 Element 6507895 or 6186867 ×3

Bricks Round and Cones 4 pieces

  • Brick Round 1 x 1 Open Stud Green Part 3062b Element 306228 ×4

Windows and Doors 4 pieces

  • Window 1 x 2 x 3 Flat Front Sand Green Part 60593 Element 6468393 or 6444504 ×4

Bricks Curved 3 pieces

  • Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Green Part 11477 Element 6618099 or 6055225 ×3

Projectiles / Launchers 3 pieces

  • Launcher, Brick Special 1 x 4 Spring Shooter with Light Bluish Gray Top Dark Bluish Gray Part 15400 Element 6324200 or 6048898 ×1
  • Projectile, Spring Shooter Ammunition 8L Bar Trans-Dark Blue Part 15303 Element 6296379 or 6065898 ×2

Containers 2 pieces

  • Bucket 1 x 1 x 1 Handle Dark Tan Part 95344 Element 6245275 or 4626884 ×1
  • Bucket 1 x 1 x 1 Light Bluish Gray Part 95343 Element 6057487 ×1

Minifig Heads 2 pieces

  • Minifig Head [Plain] [Hollow Stud] Trans-Light Blue Part 3626c Element 6066376 or 6064122 ×1
  • Minifig Head [Plain] [Hollow Stud] Trans-Red Part 3626c Element 6173950 ×1

Minifig Shields, Weapons, & Tools 2 pieces

  • Tool Pickaxe Blocky, Double Medium Lavender Part 18789 Element 6114400 ×1
  • Weapon Sword Blocky Medium Lavender Part 18787 Element 6167566 ×1

Panels 2 pieces

  • Panel 1 x 6 x 5 Dark Green Part 59349 Element 6126104 or 4586385 ×2

Technic Beams 2 pieces

  • Technic Beam 1 x 3 Thin Blue Part 6632 Element 6344176 or 4107829 ×2

Technic Bricks 2 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Dark Blue Part 3700 Element 6480279 or 6186833 ×1
  • Technic Brick 1 x 2 [2 Pin Holes] Dark Bluish Gray Part 32000 Element 4210762 ×1

Technic Connectors 2 pieces

  • Technic Pin Connector Round with 4 Clips Black Part 90202 Element 6320293 or 6052369 ×1
  • Technic Pin Connector Round 1L [Beam] Dark Bluish Gray Part 18654 Element 6100030 ×1

Technic Axles 1 piece

  • Technic Axle 3 Yellow Part 4519 Element 6130007 ×1

Tools 1 piece

  • Brick and Axle Separator v2.0 Orange Part 96874 Element 6240515 or 4654448 ×1

Minifigures 2 figures

  • Steve Minifigure, checked as a whole figure ×1
  • Alex in Medium Lavender Helmet and Armor 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

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