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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.

Retro Space Explorer

Checking

5009806 Retro Space Explorer

148 pieces in 53 part and color combinations, plus 1 minifigure.

The official piece count includes the 2 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

Blue 45 pieces

  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×2
  • Brick 1 x 4 Blue Part 3010 Element 301023 ×3
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×9
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Blue Part 54200 Element 4504380 or 4296154 1 spare in the box ×4
  • Brick Sloped 45° 2 x 2 Blue Part 3039 Element 303923 ×4
  • Brick Sloped 45° 2 x 2 Double Convex Blue Part 3045 Element 6439889 or 6234158 ×4
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×7
  • Plate 2 x 2 Corner Blue Part 2420 Element 242073 or 242023 ×2
  • Plate 2 x 3 Blue Part 3021 Element 302123 ×2
  • Plate 2 x 8 Blue Part 3034 Element 303423 ×2
  • Plate 4 x 8 Blue Part 3035 Element 303523 ×2
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Blue Part 15573 Element 6092582 ×2
  • Tile Special 2 x 2 Corner with Cut Corner - Facet Blue Part 27263 Element 6333512 ×2

Yellow 31 pieces

  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×11
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×5
  • Plate 2 x 4 Yellow Part 3020 Element 302024 ×7
  • Plate 4 x 4 Yellow Part 3031 Element 4243817 or 303124 ×5
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Yellow Part 4032a Element 403224 ×1
  • Plate Round 4 x 4 with Pin Hole Yellow Part 60474 Element 4515349 ×1
  • Plate Special 4 x 4 with 2 x 2 Opening Yellow Part 64799 Element 4549896 ×1

Red 18 pieces

  • Brick Arch 1 x 3 x 2 Curved Top Red Part 6005 Element 6212012 or 4631357 ×2
  • Brick Curved 1 x 1 x 2/3 Double Curved Top, No Studs Red Part 49307 Element 6278441 ×1
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Red Part 54200 Element 5074621 or 4504379 1 spare in the box ×2
  • Brick Special 1 x 1 with Stud on 1 Side Red Part 87087 Element 4558886 ×3
  • Plate 1 x 1 Red Part 3024 Element 302421 1 spare in the box ×3
  • Plate 1 x 1 x 2/3 with Open Stud Red Part 86996 Element 6397571 ×2
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×1
  • Tile 1 x 1 with Groove Red Part 3070b Element 307021 1 spare in the box ×2
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×2

Black 16 pieces

  • Bracket 1 x 2 - 1 x 2 Black Part 99781 Element 6016172 ×1
  • Brick Special 1 x 1 Studs on 4 Sides Black Part 4733 Element 473326 ×1
  • Panel 1 x 4 x 2 with Classic Space Logo, LEGO Logo, 'insiders 2025' Print Black Part 14718pr0016 Element 6597142 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate Round 1 x 1 with Open Stud Black Part 85861 Element 6168646 or 6100627 1 spare in the box ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×4
  • Plate Round 4 x 4 with Pin Hole Black Part 60474 Element 4515350 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Axle and Pin Connector Angled #3 - 157.5° Black Part 32016 Element 6261386 or 4107082 ×1
  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×2

Light Bluish Gray 12 pieces

  • Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side Light Bluish Gray Part 22885 Element 6123809 ×12

White 7 pieces

  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×2
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×1
  • Wedge Plate 2 x 2 Left White Part 24299 Element 6552156 or 6132203 ×2
  • Wedge Plate 2 x 2 Right White Part 24307 Element 6552157 or 6132204 ×2

Dark Tan 6 pieces

  • Plate Special 1 x 3 with 2 Studs with Groove and Inside Stud Holder (Jumper) Dark Tan Part 34103 Element 6449594 ×6

Trans-Clear 4 pieces

  • Bar, Angled with 1 x 1 Round Plate / Stud on End Trans-Clear Part 65578 Element 6510188 or 6285587 1 spare in the box ×1
  • Plate 1 x 1 Trans-Clear Part 3024 Element 6513962 or 6252041 1 spare in the box ×3

Bright Green 3 pieces

  • Brick Round 2 x 2 with Axle Hole Bright Green Part 3941 Element 6526752 or 6316319 ×3

Dark Orange 2 pieces

  • Plate 1 x 3 Dark Orange Part 3623 Element 6186007 or 4617599 ×2

Orange 2 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Orange Part 4032a Element 6030521 or 4164243 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Orange Part 15573 Element 6092599 ×1

Lime 1 piece

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Lime Part 4032a Element 6314224 or 4213047 ×1

Trans-Yellow 1 piece

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Yellow Part 54200 Element 6245272 or 4260942 ×1

Minifigures 1 figure

  • Classic Space Baby, Blue 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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