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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.

Knockturn Alley

Checking

4720 Knockturn Alley

203 pieces in 90 part and color combinations, plus 2 minifigures.

LEGO counts 209 pieces. This inventory comes from a separate parts catalog and lists 211, including the 8 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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.

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Piece checklist

Plates 44 pieces

  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×1
  • Plate 1 x 6 Dark Blue Part 3666 Element 4508313 or 4177734 ×1
  • Plate 1 x 8 Dark Blue Part 3460 Element 6250216 or 4186628 ×2
  • Plate 2 x 2 Dark Blue Part 3022 Element 6037890 or 4528982 ×3
  • Plate 2 x 4 Dark Blue Part 3020 Element 6554194 or 4667595 ×1
  • Plate 1 x 2 Dark Gray Part 3023 Element 4111983 or 302327 ×1
  • Plate 2 x 2 Dark Gray Part 3022 Element 4114003 or 302227 ×1
  • Plate 2 x 4 Dark Gray Part 3020 Element 4112232 or 302027 ×2
  • Plate 4 x 8 Dark Gray Part 3035 Element 4110027 ×2
  • Plate 6 x 6 Dark Gray Part 3958 Element 4121924 ×1
  • Plate 8 x 8 Dark Gray Part 41539 Element 4163154 ×2
  • Plate 1 x 3 Light Gray Part 3623 Element 362302 ×2
  • Plate 1 x 1 Sand Blue Part 3024 Element 6257079 or 6195028 ×2
  • Plate 1 x 2 Sand Blue Part 3023 Element 6198156 or 4167468 ×3
  • Plate 1 x 3 Sand Blue Part 3623 Element 6142245 or 4153606 ×4
  • Plate 1 x 4 Sand Blue Part 3710 Element 6111685 or 4169412 ×3
  • Plate 1 x 6 Sand Blue Part 3666 Element 6257462 or 4169464 ×2
  • Plate 2 x 2 Sand Blue Part 3022 Element 6062089 or 4153607 ×4
  • Plate 2 x 3 Sand Blue Part 3021 Element 6353800 or 4153276 ×1
  • Plate 2 x 4 Sand Blue Part 3020 Element 6248957 or 6052827 ×3
  • Plate 2 x 6 Sand Blue Part 3795 Element 6550568 or 4153430 ×3

Bricks Sloped 39 pieces

  • Brick Sloped 33° 2 x 2 Double Black Part 3300 Element 6470264 or 6083074 ×1
  • Brick Sloped 33° 3 x 4 Black Part 3297 Element 6435854 or 329726 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×4
  • Brick Sloped 45° 2 x 4 Black Part 3037 Element 303726 ×2
  • Brick Sloped 75° 2 x 1 x 3 with Open Stud Black Part 4460a ×2
  • Brick Sloped 75° 2 x 2 x 2 Quadruple Convex Black Part 3688 Element 6534130 or 6000644 ×1
  • Brick Sloped 75° 2 x 2 x 3 [Hollow Studs] Black Part 3684 Element 4286874 or 4248065 ×2
  • Brick Sloped 45° 2 x 2 Double Convex Dark Blue Part 3045 Element 4196736 ×3
  • Brick Sloped 45° 2 x 1 with Bottom Pin Dark Gray Part 3040b Element 4121970 or 4109985 ×3
  • Brick Sloped 45° 2 x 2 Dark Gray Part 3039 Element 4109984 ×8
  • Brick Sloped 45° 2 x 2 Double Convex Dark Gray Part 3045 Element 4125242 or 304527 ×1
  • Brick Sloped Inverted 45° 2 x 1 Sand Blue Part 3665 Element 6212052 or 4153279 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Sand Blue Part 3660 Element 6207929 or 4196731 ×8
  • Brick Sloped 45° 2 x 2 with Sand Green Cash Register Print Tan Part 3039pr9966 Element 4198645 ×1

Bricks Round and Cones 28 pieces

  • Brick Round 1 x 1 Open Stud Black Part 3062b Element 306226 ×18
  • Brick Round 1 x 1 Open Stud Sand Blue Part 3062b Element 4165656 ×6
  • Cone 1 x 1 [No Top Groove] Trans-Dark Blue Part 4589 Element 618843 ×1
  • Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×2
  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×1

Bricks 26 pieces

  • Brick 1 x 1 x 5 with Blocked Open or Hollow Stud Black Part 2453a Element 245326 ×1
  • Brick 1 x 2 Black Part 3004 Element 300426 ×6
  • Brick 1 x 2 x 5 with Blocked Open Studs and Bottom Stud Holder with Asymmetric Ridges Black Part 2454a ×1
  • Brick 1 x 6 Black Part 3009 Element 300926 ×1
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×2
  • Brick 1 x 1 Dark Gray Part 3005 Element 4114079 or 300527 ×6
  • Brick 1 x 1 with Angry Eye Left / Sad Eye Right Print Light Gray Part 3005pr9995 Element 4158811 ×1
  • Brick 1 x 1 with Angry Eye Right / Sad Eye Left Print Light Gray Part 3005pr9994 Element 4158812 ×1
  • Brick 1 x 2 Sand Blue Part 3004 Element 6177142 or 4153374 ×5
  • Brick 2 x 2 Sand Blue Part 3003 Element 6506825 or 4196738 ×2

Hinges, Arms and Turntables 13 pieces

  • Hinge Brick 1 x 2 Top Plate Thin Black Part 3938 Element 393826 ×1
  • Hinge Brick 1 x 4 [Lower] Black Part 3831 Element 383126 ×1
  • Hinge Brick 1 x 4 [Upper] Black Part 3830 Element 6344999 or 6011458 ×1
  • Hinge Plate 1 x 2 Locking with 2 Fingers On End, with Groove, 9 Teeth Black Part 44302a Element 4183060 ×2
  • Hinge Plate 1 x 2 Locking with 1 Finger On End, with Groove Dark Gray Part 44301a Element 4183044 ×2
  • Hinge Plate 1 x 2 Locking with 1 Finger on Side, with Groove Dark Gray Part 44567a Element 4185621 ×1
  • Hinge Brick 1 x 2 Base Light Gray Part 3937 Element 393702 ×3
  • Hinge Brick 2 x 2 Top Plate Thin Red Part 6134 Element 613421 ×2

Plates Special 9 pieces

  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×2
  • Plate Special 1 x 2 with Door Rail Black Part 32028 Element 4107761 ×4
  • Plate Special 1 x 2 Side Handle [Free Ends] Dark Blue Part 2540 Element 4184066 ×1
  • Plate Special 4 x 4, Studs on One Edge Plain] Dark Gray Part 6179 Element 4173360 or 617927 ×1
  • Bracket 1 x 2 - 2 x 2 Light Gray Part 44728 Element 4297346 or 4185274 ×1

Tiles 8 pieces

  • Tile 1 x 1 with Groove Black Part 3070b Element 307026 1 spare in the box ×2
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×3
  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×1
  • Tile 1 x 2 with Spooky Green Hand Print Light Gray Part 3069bpr0181 Element 4198640 ×1
  • Tile 1 x 2 with Spider and Bag Print White Part 3069bpr0120 Element 4119411 ×1

Bricks Curved 6 pieces

  • Brick Arch 1 x 6 Black Part 3455 Element 345526 ×3
  • Brick Arch 1 x 6 x 2 Curved Top Black Part 6183 Element 6132770 or 4299388 ×1
  • Brick Arch 1 x 3 Dark Gray Part 4490 Element 4118870 or 449027 ×2

Panels 6 pieces

  • Panel 1 x 2 x 1 [Square Corners] Black Part 4865a Element 486526 ×2
  • Panel 1 x 2 x 3 [Hollow Studs] Black Part 2362b Element 236226 ×2
  • Panel 1 x 4 x 3 [Hollow Studs] Black Part 4215b Element 4105207 ×2

Plates Round Curved and Dishes 6 pieces

  • Plate Round Corner 3 x 3 Sand Blue Part 30357 Element 4196735 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Green Part 6141 Element 6514057 or 6240221 1 spare in the box ×3
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×1

Animals / Creatures 3 pieces

  • Animal, Bird, Owl Large, Rounded Features Dark Gray Part 40232 Element 4153284 ×2
  • Insect, Spider Trans-Neon Green Part 30238 Element 6109894 or 4120133 ×1

Minifig Heads 3 pieces

  • Minifig Head (No Face), Purple Brain Print Trans-Clear Part 3626bpr0311 Element 4172353 ×1
  • Minifig Head Skeleton, Evil Skull Print White Part 3626bpr0190 Element 4162427 ×2

Bars, Ladders and Fences 2 pieces

  • Bar 1 x 3 [Clip / Anti-Stud] Black Part 4735 Element 4141580 or 473576 ×2

Bricks Special 2 pieces

  • Brick Special 1 x 4 with Groove Black Part 2653 Element 265326 ×2

Energy Effects 2 pieces

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

Minifig Accessories 2 pieces

  • Equipment Sextant Black Part 30154 Element 4113944 ×1
  • Equipment Goblet / Glass Trans-Green Part 2343 Element 4156814 ×1

Rock 2 pieces

  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Purple Part 30153 Element 6513977 or 6247799 ×1
  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Red Part 30153 Element 6513969 or 6247785 ×1

Plates Wedged 1 piece

  • Wedge Plate 8 x 8 Cut Corner Dark Gray Part 30504 Element 4196734 ×1

Windows and Doors 1 piece

  • Window Bay 3 x 8 x 6 with Trans-Brown Glass Black Part 30185c01 Element 4196803 ×1

Minifigures 2 figures

  • Harry Potter, Yellow Skin, Sand Green Sweater Minifigure, checked as a whole figure ×1
  • Lucius Malfoy, Yellow Skin, Black Suit 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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