BlockTalk Find Your Set

Free tool

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.

Classic Trial Size

Checking

4284 Classic Trial Size

119 pieces in 46 part and color combinations, plus 1 minifigure.

LEGO counts 121 pieces. This inventory comes from a separate parts catalog and lists 123, including the 4 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.

Show

Piece checklist

Blue 38 pieces

  • Brick 1 x 1 Blue Part 3005 Element 300523 ×6
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×4
  • Brick 1 x 3 Blue Part 3622 Element 362223 ×2
  • Brick 1 x 4 Blue Part 3010 Element 301023 ×4
  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×2
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×1
  • Brick Sloped 33° 3 x 1 Blue Part 4286 Element 428623 ×2
  • Brick Sloped 33° 3 x 2 Blue Part 3298 Element 6294307 or 6141996 ×4
  • Brick Sloped 33° 3 x 2 with Red on Yellow Triangles Print Blue Part 3298pr0005 Element 4107821 ×2
  • Brick Sloped 33° 3 x 4 Blue Part 3297 Element 6088711 or 329723 ×2
  • Brick Sloped 45° 2 x 2 Blue Part 3039 Element 303923 ×2
  • Brick Sloped Inverted 34° 3 x 1 without Internal Stopper Blue Part 4287a ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Blue Part 3660 Element 366023 ×2
  • Brick Special 1 x 1 with Headlight Blue Part 4070 Element 407023 ×2
  • Propeller 4 Blade 5 Diameter with Rounded Ends, Open Hub Blue Part 2479 Element 4192952 or 247923 ×1

Red 26 pieces

  • Brick 1 x 1 Red Part 3005 Element 300521 ×4
  • Brick 1 x 1 with Simple Eye Black and White Print Red Part 3005pr9996 Element 4107819 ×2
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×2
  • Brick 1 x 4 Red Part 3010 Element 301021 ×2
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×2
  • Plant, Flower - Small Red Part 3742 1 spare in the box ×3
  • Plate 1 x 4 Red Part 3710 Element 371021 ×2
  • Plate 2 x 4 Red Part 3020 Element 302021 ×2
  • Plate 2 x 8 Red Part 3034 Element 303421 ×2
  • Plate 4 x 10 Red Part 3030 Element 4535164 or 4188302 ×1
  • Wheel Freestyle with 2 x 2 Studs and Pin Hole Red Part 6248 Element 4144357 or 624821 ×4

White 25 pieces

  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×6
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×4
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×4
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×2
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×1
  • Brick Round 1 x 1 Open Stud White Part 3062b Element 6619283 or 306201 ×8

Yellow 19 pieces

  • Antenna 1 x 4 with Rounded Top Yellow Part 3957a Element 4497183 or 395724 ×1
  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×6
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×4
  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×2
  • Brick 2 x 2 Yellow Part 3003 Element 4103588 or 300374 ×2
  • Fence Lattice 1 x 4 x 1 Yellow Part 3633 Element 4190509 or 363324 ×2
  • Steering Stand 1 x 2 with Black Steering Wheel Yellow Part 3829c01 Element 9553 ×1
  • Tile Special 2 x 2 with Top Pin Yellow Part 2460 Element 246024 ×1

Black 6 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×2
  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×4

Dark Gray 2 pieces

  • Brick Special 2 x 2 with 2 Pins and Axle Hole Dark Gray Part 30000 Element 3000027 ×2

Green 2 pieces

  • Baseplate 8 x 16 Green Part 3865 Element 4219812 or 4179599 ×1
  • Plant, Flower Stem Green Part 3741 Element 6277589 or 374128 ×1

Trans-Clear 1 piece

  • Brick Sloped 45° 2 x 2 Trans-Clear Part 3039 Element 6514100 or 6244886 ×1

Minifigures 1 figure

  • Man - White Suit, Blue Arm, Light Gray Legs, White Cap 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.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy