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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 Joker Battle Training

Checking

30523 The Joker Battle Training

44 pieces in 25 part and color combinations, plus 1 minifigure.

The official piece count includes the 5 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.

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Piece checklist

Black 16 pieces

  • Animal, Bat Black Part 30103 Element 4587312 or 4106513 ×1
  • Bracket 1 x 2 - 1 x 2 Inverted Black Part 99780 Element 6020193 ×1
  • Leg Skeleton Black Part 6266 Element 6240496 or 6038453 1 spare in the box ×2
  • Mask, Batman Cowl [Plain] Black Part 10113 Element 6170706 or 6014618 ×1
  • Minifig Neckwear Bracket [One Stud] Black Part 42446 Element 6020192 or 4261427 1 spare in the box ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×1
  • Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×2
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Black Part 15573 Element 6092585 ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Black Part 87580 Element 6663108 or 4565323 ×1
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×1
  • Weapon Batarang Black Part 98721 Element 4650620 1 spare in the box ×1
  • Weapon Gun / Blaster with Hollow Studs on Sides and Inside Axle Holder Black Part 24144 Element 6134781 ×1
  • Wedge Plate 4 x 4 with 2 x 2 Cutout Black Part 43719 Element 6275401 or 4561035 ×1

Trans-Bright Green 14 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Bright Green Part 6141 Element 6514053 or 6240206 1 spare in the box ×14

White 4 pieces

  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 1 spare in the box ×1
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×2
  • Tile Round 1 x 1 White Part 98138 Element 6564903 or 6284572 1 spare in the box ×1

Dark Bluish Gray 3 pieces

  • Launcher, Weapon Rapid Shooter Six Barrel, 3 Fingers Dark Bluish Gray Part 18588 Element 6100488 ×1
  • Plate 2 x 2 Dark Bluish Gray Part 3022 Element 4211094 ×1
  • Plate Special 2 x 2 with 1 Pin Hole [Complete Underside Rib] Dark Bluish Gray Part 10247 Element 6047417 ×1

Red 3 pieces

  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×2
  • Tile Special 2 x 2 with Top Pin Red Part 2460 Element 246021 ×1

Yellow 3 pieces

  • Launcher Trigger, Weapon Rapid Shooter, Flat Axle Hole Yellow Part 18587 Element 6100103 ×1
  • Plate Round 4 x 4 with Pin Hole Yellow Part 60474 Element 4515349 ×2

Dark Tan 1 piece

  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×1

Minifigures 1 figure

  • The Joker with Long Coattails 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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