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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.

Sydney Opera House

Checking

10234 Sydney Opera House

2,989 pieces in 219 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

Dark Tan 1,051 pieces

  • Brick 1 x 1 Dark Tan Part 3005 Element 6001824 or 4497070 ×25
  • Brick 1 x 2 Dark Tan Part 3004 Element 4521914 or 4497069 ×48
  • Brick 1 x 4 Dark Tan Part 3010 Element 6001822 or 4497072 ×58
  • Brick 1 x 6 Dark Tan Part 3009 Element 4497071 or 4247151 ×55
  • Brick 2 x 2 Dark Tan Part 3003 Element 4497068 or 4255416 ×21
  • Brick 2 x 4 Dark Tan Part 3001 Element 4497066 or 4247145 ×20
  • Brick Arch 1 x 5 x 4 [Irregular Bow, Raised Underside Cross Supports] Dark Tan Part 76768 Element 6024122 ×2
  • Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] Dark Tan Part 11153 Element 6583511 or 6045943 ×16
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] Dark Tan Part 85080 Element 6001826 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Dark Tan Part 54200 Element 6040126 or 6015451 4 spares in the box ×28
  • Brick Sloped 30° 1 x 2 x 2/3 Dark Tan Part 85984 Element 6015449 ×101
  • Brick Sloped 33° 3 x 1 Dark Tan Part 4286 Element 6015454 or 4247147 ×50
  • Brick Sloped 45° 2 x 1 with Bottom Pin Dark Tan Part 3040b Element 4530678 or 4251973 ×2
  • Plate 1 x 1 Dark Tan Part 3024 Element 4549436 or 4497084 2 spares in the box ×32
  • Plate 1 x 2 Dark Tan Part 3023 Element 4528604 or 4497082 ×57
  • Plate 1 x 4 Dark Tan Part 3710 Element 4626904 or 4497088 ×37
  • Plate 1 x 6 Dark Tan Part 3666 Element 6015424 ×60
  • Plate 16 x 16 Dark Tan Part 91405 Element 4613196 ×1
  • Plate 2 x 2 Corner Dark Tan Part 2420 Element 4550168 ×18
  • Plate 2 x 3 Dark Tan Part 3021 Element 6035540 or 6015192 ×33
  • Plate 2 x 4 Dark Tan Part 3020 Element 4497077 or 4267874 ×29
  • Plate 2 x 6 Dark Tan Part 3795 Element 4550329 ×37
  • Plate 2 x 8 Dark Tan Part 3034 Element 4246957 ×15
  • Plate 4 x 8 Dark Tan Part 3035 Element 6006524 or 4246954 ×5
  • Plate 6 x 12 Dark Tan Part 3028 Element 4266897 ×10
  • Plate 6 x 14 Dark Tan Part 3456 Element 6035541 ×3
  • Plate 6 x 8 Dark Tan Part 3036 Element 4251796 ×18
  • Plate 8 x 16 Dark Tan Part 92438 Element 4624163 ×7
  • Plate Special 2 x 2 with Pin on Bottom Dark Tan Part 2476a Element 6606096 or 6276849 ×32
  • Plate Special 4 x 4, Studs on One Edge Plain] Dark Tan Part 6179 Element 4616574 ×6
  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×4
  • Tile 1 x 2 with Groove Dark Tan Part 3069b Element 4496699 ×44
  • Tile 1 x 3 Dark Tan Part 63864 Element 6015452 ×37
  • Tile 1 x 6 with Groove Dark Tan Part 6636 Element 4507047 or 4251129 ×77
  • Tile 2 x 2 with Groove Dark Tan Part 3068b Element 4507045 or 4251986 ×31
  • Wedge Plate 2 x 4 Dark Tan Part 51739 Element 6003379 ×8
  • Wedge Plate 3 x 2 Left Dark Tan Part 43723 Element 6002843 ×6
  • Wedge Plate 3 x 2 Right Dark Tan Part 43722 Element 6002847 ×5
  • Wedge Plate 3 x 3 Cut Corner Dark Tan Part 2450 Element 6038637 or 4505141 ×2
  • Wedge Plate 6 x 3 Left Dark Tan Part 54384 Element 6002851 ×5
  • Wedge Plate 6 x 3 Right Dark Tan Part 54383 Element 6002849 ×4

White 524 pieces

  • Bracket 1 x 2 - 1 x 2 White Part 99781 Element 6552141 or 6548275 ×3
  • Brick 1 x 12 White Part 6112 Element 6548281 or 611201 ×3
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×8
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×11
  • Brick Curved 2 x 1 No Studs [1/2 Bow] White Part 11477 Element 6552145 or 6548276 ×15
  • Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] White Part 11153 Element 6578744 or 6564905 ×43
  • Brick Sloped 33° 3 x 1 White Part 4286 Element 6632142 or 428601 ×14
  • Brick Sloped 33° 3 x 2 White Part 3298 Element 329801 ×116
  • Brick Sloped 33° 3 x 3 Double Concave White Part 99301 Element 6353502 or 6035542 ×4
  • Brick Sloped 45° 2 x 2 White Part 3039 Element 6552103 or 303901 ×9
  • Brick Special 1 x 2 with Groove White Part 4216 Element 6619288 or 4264360 ×5
  • Brick Wedged, Curved 4 x 4 No Top Studs White Part 47753 Element 6552136 or 6002767 ×5
  • Brick Wedged, Curved 6 x 2 Left, Inner Ridges White Part 41748 Element 6552117 or 4160124 ×3
  • Brick Wedged, Curved 6 x 2 Right, Inner Ridges White Part 41747 Element 4160101 ×3
  • Brick Wedged, Curved 8 x 3 x 2 Open Left White Part 41750 Element 6312345 or 6038751 ×35
  • Brick Wedged, Curved 8 x 3 x 2 Open Right White Part 41749 Element 6312346 or 6038641 ×34
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] White Part 73983 Element 6102776 or 4287153 ×2
  • Plate 1 x 1 White Part 3024 Element 6548262 or 302401 1 spare in the box ×9
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×2
  • Plate 2 x 2 Corner White Part 2420 Element 6548254 or 242051 ×2
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×7
  • Plate 4 x 4 White Part 3031 Element 6552127 or 4243812 ×4
  • Plate 4 x 4 Corner White Part 2639 Element 6552129 or 4508662 ×12
  • Plate Special 1 x 2 with Handle on End [Closed Ends] White Part 60478 Element 6552131 or 4515364 ×2
  • Technic Beam 1 x 11 Thick White Part 32525 Element 6028103 or 4296265 ×4
  • Technic Beam 1 x 7 Thick White Part 32524 Element 6564912 or 6318056 ×4
  • Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole White Part 92013 Element 6021315 or 4619762 ×6
  • Technic Plate 2 x 4 [3 Holes] White Part 3709 Element 370901 ×5
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×65
  • Tile 1 x 3 White Part 63864 Element 6552134 or 6548270 ×14
  • Tile 1 x 6 with Groove White Part 6636 Element 6548296 or 663601 ×26
  • Tile 2 x 4 with Groove White Part 87079 Element 6548271 or 4560178 ×12
  • Wedge Plate 3 x 2 Left White Part 43723 Element 6552121 or 4179875 ×1
  • Wedge Plate 3 x 2 Right White Part 43722 Element 6552120 or 4179874 ×1
  • Wedge Plate 3 x 3 Cut Corner White Part 2450 Element 6601842 or 4280148 ×7
  • Wedge Plate 4 x 2 Left White Part 41770 Element 6552119 or 4161326 ×9
  • Wedge Plate 4 x 2 Right White Part 41769 Element 6552118 or 4160857 ×9
  • Wedge Plate 4 x 4 Cut Corner White Part 30503 Element 6615550 or 4160215 ×10

Black 361 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×2
  • Brick 1 x 8 Black Part 3008 Element 300826 ×6
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×2
  • Brick 2 x 2 x 3 Black Part 30145 Element 4113241 ×2
  • Brick 2 x 4 Black Part 3001 Element 300126 ×5
  • Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] Black Part 11153 Element 6580394 or 6037746 ×6
  • Brick Curved 4 x 2 No Studs Black Part 93606 Element 4647286 ×4
  • Brick Curved 6 x 1 Black Part 42022 Element 4160393 ×4
  • Brick Round 2 x 2 Dome Top, Hollow Stud Black Part 30367c Element 4216660 ×2
  • Brick Round Corner 10 x 10 with Slope 33° Edge, Axle Hole, Facet Cutout Black Part 58846 Element 6454174 or 6015466 ×2
  • Brick Round Corner 6 x 6 with 33° Slope and Facet Cutout Black Part 95188 Element 6605464 or 6337391 ×2
  • Brick Sloped 33° 3 x 1 Black Part 4286 Element 428626 ×6
  • Brick Sloped 33° 3 x 2 Black Part 3298 Element 329826 ×5
  • Brick Sloped 45° 2 x 1 Triple with Ovoid Bottom Pin Black Part 3048c Element 304826 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×33
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×2
  • Brick Sloped 45° 2 x 4 Black Part 3037 Element 303726 ×13
  • Brick Sloped 65° 2 x 1 x 2 Black Part 60481 Element 4515373 ×11
  • Brick Sloped 65° 2 x 2 x 2 with Bottom Tube Black Part 3678b Element 4273703 or 4256421 ×17
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×12
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×42
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×21
  • Brick Wedged 3 x 3 Cut Corner Black Part 30505 Element 4159550 ×8
  • Brick Wedged, Curved 6 x 2 Left, Inner Ridges Black Part 41748 Element 4160130 ×2
  • Brick Wedged, Curved 6 x 2 Right, Inner Ridges Black Part 41747 Element 4160108 ×2
  • Equipment Telescope / Torch / Spyglass, Support Round 1 x 1 x 1 2/3 Black Part 64644 Element 4538456 ×28
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Black Part 73983 Element 6102782 or 74011 ×14
  • Plate 1 x 1 Black Part 3024 Element 302426 1 spare in the box ×3
  • Plate 1 x 12 Black Part 60479 Element 4514845 ×8
  • Plate 1 x 3 Black Part 3623 Element 362326 ×6
  • Plate 1 x 8 Black Part 3460 Element 346026 ×2
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Black Part 60470b Element 6310268 or 4556158 ×1
  • Plate Special 2 x 6 x 2/3 with 4 Studs on Side, 1 Support Wall on Bottom Black Part 87609 Element 4653049 ×2
  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×3
  • Technic Axle Connector 2 x 3 with Ball Socket, Open Lower Axle Holes Black Part 93571 Element 4610948 ×2
  • Technic Beam 1 x 2 with Ball Joint Straight, Smooth Ball Black Part 64276 Element 4560108 or 4537514 ×12
  • Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole Black Part 92013 Element 4619763 ×10
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 4 spares in the box ×20
  • Technic Plate 2 x 6 [5 Holes] Black Part 32001 Element 3200126 ×8
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×5
  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×10
  • Turntable 2 x 2 Plate, Base Black Part 3680 Element 368076 or 368026 ×2
  • Wedge Plate 3 x 3 Cut Corner Black Part 2450 Element 4227684 or 245026 ×8
  • Wedge Plate 4 x 4 Cut Corner Black Part 30503 Element 4160025 ×2

Light Bluish Gray 314 pieces

  • Brick 1 x 1 Light Bluish Gray Part 3005 Element 4211389 ×18
  • Brick 1 x 12 Light Bluish Gray Part 6112 Element 4211522 ×6
  • Brick 1 x 16 Light Bluish Gray Part 2465 Element 4211366 ×23
  • Brick 1 x 8 Light Bluish Gray Part 3008 Element 4211392 ×10
  • Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] Light Bluish Gray Part 11153 Element 6578746 or 6042950 ×19
  • Brick Sloped 33° 3 x 1 Light Bluish Gray Part 4286 Element 4211488 ×8
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×26
  • Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×13
  • Plate 1 x 8 Light Bluish Gray Part 3460 Element 4211425 ×25
  • Plate 2 x 10 Light Bluish Gray Part 3832 Element 4211462 ×4
  • Plate 2 x 12 Light Bluish Gray Part 2445 Element 4211360 ×8
  • Plate 2 x 14 Light Bluish Gray Part 91988 Element 4662161 ×7
  • Plate 2 x 16 Light Bluish Gray Part 4282 Element 4211486 ×2
  • Plate 2 x 3 Light Bluish Gray Part 3021 Element 4211396 ×46
  • Plate 2 x 4 Light Bluish Gray Part 3020 Element 4211395 ×23
  • Plate 2 x 6 Light Bluish Gray Part 3795 Element 4211452 or 3795194 ×11
  • Plate 2 x 8 Light Bluish Gray Part 3034 Element 4211406 ×3
  • Plate 3 x 3 Light Bluish Gray Part 11212 Element 6015347 ×6
  • Plate 4 x 10 Light Bluish Gray Part 3030 Element 4211402 ×4
  • Plate 4 x 4 Light Bluish Gray Part 3031 Element 4243797 or 4211403 ×2
  • Plate 4 x 6 Light Bluish Gray Part 3032 Element 4211404 ×18
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Bluish Gray Part 2654 Element 4278273 or 4276273 ×4
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×1
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×1
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×1
  • Technic Brick 1 x 14 [13 Pin Holes] Light Bluish Gray Part 32018 Element 4211705 ×8
  • Tile Round 1 x 1 Light Bluish Gray Part 98138 Element 6284071 or 4650260 1 spare in the box ×5
  • Turntable 2 x 2 Plate - Top Light Bluish Gray Part 3679 Element 4540203 or 4495467 ×2
  • Wedge Plate 6 x 3 Left Light Bluish Gray Part 54384 Element 4282789 ×5
  • Wedge Plate 6 x 3 Right Light Bluish Gray Part 54383 Element 4282786 ×5

Trans-Brown 217 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Brown Part 3065 Element 6514267 or 6244909 ×58
  • Brick 1 x 2 x 5 without Side Supports Trans-Brown Part 46212 Element 6258834 or 6030737 ×25
  • Brick 1 x 4 without Bottom Tubes Trans-Brown Part 3066 Element 6514079 or 6245290 ×4
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Brown Part 54200 Element 6245263 or 4244368 4 spares in the box ×82
  • Brick Wedged, Curved 8 x 3 x 2 Open Left Trans-Brown Part 41750 Element 6030735 or 4520020 ×4
  • Brick Wedged, Curved 8 x 3 x 2 Open Right Trans-Brown Part 41749 Element 6030736 or 4520019 ×4
  • Plate 1 x 2 Trans-Brown Part 3023 Element 6514006 or 6240219 ×40

Blue 150 pieces

  • Baseplate 16 x 32 Blue Part 3857 Element 4226002 or 274823 ×1
  • Baseplate 32 x 32 Blue Part 3811 Element 4219691 or 381123 ×1
  • Baseplate 48 x 48 Blue Part 4186 Element 6030733 or 4228058 ×1
  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Blue Part 47457 Element 4496366 ×2
  • Brick Special 1 x 4 with 4 Studs on One Side Blue Part 30414 Element 4212411 or 4141768 ×4
  • Hinge Brick 2 x 2 Top Plate Thin Blue Part 6134 Element 4195007 or 4118900 ×2
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Blue Part 73983 Element 6102759 or 4119371 ×12
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×7
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×44
  • Plate 1 x 6 Blue Part 3666 Element 366623 ×1
  • Plate Round 1 x 1 with Solid Stud Blue Part 6141 Element 614123 1 spare in the box ×6
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Blue Part 3794b Element 379423 ×2
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×38
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 2 spares in the box ×16
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×12
  • Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle Hole Blue Part 32124 Element 6280384 or 4112874 ×1

Yellow 104 pieces

  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×16
  • Brick 2 x 4 Yellow Part 3001 Element 300124 ×18
  • Plate 1 x 1 Yellow Part 3024 Element 302424 1 spare in the box ×9
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×49
  • Plate Special 3 x 2 with Rounded End, Hole Yellow Part 3176 Element 4188313 or 4141738 ×4
  • Technic Beam 1 x 9 Thick Yellow Part 40490 Element 6115616 or 4187136 ×4
  • Technic Pin Connector Round [Slotted] Yellow Part 62462 Element 6173122 or 4526983 ×4

Dark Bluish Gray 82 pieces

  • Bracket 1 x 2 - 1 x 2 Inverted Dark Bluish Gray Part 99780 Element 6000606 ×4
  • Brick Round 2 x 2 with Axle Hole Dark Bluish Gray Part 3941 Element 4249139 ×25
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Dark Bluish Gray Part 3747b Element 4211064 ×4
  • Brick Special 1 x 2 with Grille Dark Bluish Gray Part 2877 Element 4210636 ×4
  • Hinge Brick 1 x 2 Base Dark Bluish Gray Part 3937 Element 4211066 ×2
  • Plate 2 x 2 Dark Bluish Gray Part 3022 Element 4211094 ×13
  • Plate 4 x 12 Dark Bluish Gray Part 3029 Element 4210706 ×1
  • Plate 6 x 8 Dark Bluish Gray Part 3036 Element 4210794 ×2
  • Plate Special 3 x 2 with Rounded End, Hole Dark Bluish Gray Part 3176 Element 4225733 ×4
  • Technic Axle and Pin Connector Angled #4 - 135° Dark Bluish Gray Part 32192 Element 6262899 or 4210688 ×9
  • Technic Beam 1 x 2 with Ball Joint Angled Dark Bluish Gray Part 50923 Element 4503381 or 4289258 ×4
  • Technic Brick 1 x 14 [13 Pin Holes] Dark Bluish Gray Part 32018 Element 4211137 ×6
  • Technic Brick 1 x 2 with Hole and Dual Beam Extensions Dark Bluish Gray Part 85943 Element 6324639 or 4547958 ×1
  • Technic Brick Special 2 x 2 with Ball and Axle Hole, with 6 Holes in Ball Dark Bluish Gray Part 57909b Element 4497253 ×2
  • Wedge Plate 12 x 3 Right Dark Bluish Gray Part 47398 Element 4209014 ×1

Reddish Brown 74 pieces

  • Brick 2 x 6 Reddish Brown Part 2456 Element 4286200 or 4216615 ×11
  • Brick Round 2 x 2 [Grill] Reddish Brown Part 92947 Element 6036503 ×2
  • Brick Sloped 45° 2 x 2 Reddish Brown Part 3039 Element 4211202 ×4
  • Plate 1 x 10 Reddish Brown Part 4477 Element 4223683 ×13
  • Plate 1 x 3 Reddish Brown Part 3623 Element 4211152 ×7
  • Plate 1 x 6 Reddish Brown Part 3666 Element 4221590 ×11
  • Technic Brick 1 x 2 [1 Pin Hole] Reddish Brown Part 3700 Element 4211252 ×14
  • Technic Brick 1 x 4 [3 Pin Holes] Reddish Brown Part 3701 Element 4267994 ×12

Trans-Dark Blue 31 pieces

  • Tile 1 x 2 with Groove Trans-Dark Blue Part 3069b Element 6514219 or 6251289 ×31

Trans-Clear 28 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box ×28

Red 25 pieces

  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Red Part 3794b Element 379421 ×7
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×6
  • Technic Axle and Pin Connector Angled #5 - 112.5° Red Part 32015 Element 6271348 or 4227544 ×2
  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Red Part 32064b ×10

Tan 23 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Tan Part 4032a Element 4140562 or 403205 ×21
  • Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm] Tan Part 88072 Element 6261357 or 4655257 ×2

Dark Brown 2 pieces

  • Technic Axle and Pin Connector Angled Triple [120° Offset] Dark Brown Part 10288 Element 6273219 or 6005755 ×2

Orange 2 pieces

  • Brick and Axle Separator v2.0 Orange Part 96874 Element 6240515 or 4654448 ×1
  • Plate 1 x 2 Orange Part 3023 Element 4177932 or 4163009 ×1

Green 1 piece

  • Plate 1 x 2 Green Part 3023 Element 302328 ×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.