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.
1,864 pieces in 465 part and color combinations, plus 2 minifigures.
The official piece count includes the 8 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.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Brick Round 1 x 1 Open StudWhite ×1Trans-Clear ×2Trans-Clear is see-through: hold the piece up to a light.
Tile 1 x 1 with GrooveLight Bluish Gray ×4Metallic Silver ×4Light Bluish Gray is yellower than Metallic Silver.
Tile 1 x 2 with GrooveLight Bluish Gray ×7Metallic Silver ×2Light Bluish Gray is yellower than Metallic Silver.
Tile 1 x 3Light Bluish Gray ×6Metallic Silver ×8Light Bluish Gray is yellower than Metallic Silver.
Plate Round 1 x 1 with Solid StudOrange ×4Trans-Orange ×1Trans-Orange is see-through: hold the piece up to a light.
Bracket 1 x 1 - 1 x 1 InvertedBlack ×4Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
30 more look-alike pairs
Bracket 1 x 2 - 1 x 2 InvertedBlack ×8Dark Bluish Gray ×12Black is darker than Dark Bluish Gray.
Bracket 1 x 2 - 2 x 2 InvertedBlack ×4Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Brick 1 x 1Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Brick Curved 2 x 2 x 2/3Black ×8Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Black ×4Dark Bluish Gray ×9Black is darker than Dark Bluish Gray.
Brick Sloped 30° 1 x 2 x 2/3Black ×13Dark Bluish Gray ×10Black is darker than Dark Bluish Gray.
Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version]Black ×7Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no studBlack ×2Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Plate 1 x 1Black ×20Dark Bluish Gray ×13Black is darker than Dark Bluish Gray.
Plate 1 x 10Black ×3Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 1 x 2Black ×30Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Plate 1 x 3Black ×7Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Plate 1 x 4Black ×7Dark Bluish Gray ×10Black is darker than Dark Bluish Gray.
Plate 1 x 8Black ×14Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate 2 x 14Black ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate 2 x 2Black ×12Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate 2 x 4Black ×1Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate 4 x 8Black ×4Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate Special 1 x 2 [Side Handle Closed Ends]Black ×5Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]Black ×1Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate Special 1 x 2 with Handle on End [Closed Ends]Black ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate Special 1 x 2, Top Clip [Open O]Black ×1Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate Special 2 x 2 with 1 Pin Hole [Complete Underside Rib]Black ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate Special 2 x 2 with Only 2 studsBlack ×8Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile 1 x 2 with GrooveBlack ×8Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Tile 1 x 6 with GrooveBlack ×8Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Tile 1 x 8 with GrooveBlack ×6Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile 2 x 2 CornerBlack ×6Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Tile 2 x 4 with GrooveBlack ×4Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Wedge Plate 2 x 2 Cut CornerBlack ×8Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tap 1 x 1 without Hole in SpoutBluePart 4599bElement 4599231 spare in the box×2
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×4
Technic Pin Long with Friction Ridges Lengthwise, 1 Center SlotBluePart 42924Element 6299413×8
Tile 1 x 2 with GrooveBluePart 3069bElement 306923×1
Tile 1 x 4 with GrooveBluePart 2431Element 243123×1
Medium Nougat
24 pieces
Brick Curved 2 x 1 No Studs [1/2 Bow]Medium NougatPart 11477Element 6356566 or 6167646×4
Plate 1 x 1 x 2/3 with Open StudMedium NougatPart 86996Element 6383946×10
Plate 1 x 5Medium NougatPart 78329Element 6343854×2
Tile 1 x 2 with GrooveMedium NougatPart 3069bElement 6021997×4
Tile Round 1 x 1Medium NougatPart 98138Element 6284589 or 6055383×4
Sand Blue
17 pieces
Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version]Sand BluePart 15672Element 6139519×2
Plate 1 x 2Sand BluePart 3023Element 6198156 or 4167468×6
Plate 1 x 3Sand BluePart 3623Element 6142245 or 4153606×2
Plate Special 1 x 2 with Door RailSand BluePart 32028Element 6234348×4
Tile 1 x 1 with GrooveSand BluePart 3070bElement 6138232 or 41736981 spare in the box×2
Tile 1 x 2 with GrooveSand BluePart 3069bElement 6142505 or 4170251×1
Medium Azure
15 pieces
Brick 1 x 1 x 3Medium AzurePart 14716Element 6149781×1
Brick 1 x 4Medium AzurePart 3010Element 6603319 or 6036238×1
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Medium AzurePart 54200Element 6603283 or 46195201 spare in the box×4
Plate 1 x 8Medium AzurePart 3460Element 6603335 or 6074793×3
Plate 2 x 8Medium AzurePart 3034Element 6603343 or 6253666×2
Technic Beam 1 x 4 ThinMedium AzurePart 32449Element 6374811 or 6364749×4
Orange
15 pieces
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Plate Round 1 x 1 with Solid StudOrangePart 6141Element 41571031 spare in the boxAlso in Trans-Orange×4
Technic Axle and Pin Connector PerpendicularOrangePart 6536Element 6261377 or 6135088×8
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside]OrangePart 48267Element 6292485×2
Sand Green
13 pieces
Brick Curved 1 x 1 x 2/3 Double Curved Top, No StudsSand GreenPart 49307Element 6335233×1
Creature Body Part, Horn (Unicorn)Sand GreenPart 89522Element 6223215 or 60709051 spare in the box×4
Plate 1 x 3Sand GreenPart 3623Element 6069257 or 4642427×6
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring]Sand GreenPart 4081bElement 6391133×2
Dark Orange
12 pieces
Bracket 1 x 1 - 1 x 1Dark OrangePart 36841Element 6248949×12
Dark Tan
12 pieces
Plate 1 x 12Dark TanPart 60479Element 6275088×2
Plate 1 x 8Dark TanPart 3460Element 6156492 or 4246960×2
Plate 4 x 6Dark TanPart 3032Element 6167894 or 4266898×1
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×6
Tile Special Round 2 x 2 with HoleDark TanPart 15535Element 6132790×1
Trans-Orange
8 pieces
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Trans-OrangePart 54200Element 6245265 or 42443691 spare in the box×4
Plate Round 1 x 1 with Solid StudTrans-OrangePart 6141Element 6514059 or 62402271 spare in the boxAlso in Orange×1
Tile Round 1 x 1Trans-OrangePart 98138Element 6514197 or 62747471 spare in the box×3
Trans-Red
8 pieces
Tile 1 x 1 with GrooveTrans-RedPart 3070bElement 6581817 or 62542481 spare in the box×8
Dark Pink
6 pieces
Plate 1 x 2Dark PinkPart 3023Element 6057387 or 4245302×1
Plate 2 x 4Dark PinkPart 3020Element 6056263 or 6015824×1
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)Dark PinkPart 4032aElement 6326495×1
Tile 2 x 6Dark PinkPart 69729Element 6381248×1
Tile Round 1 x 1 QuarterDark PinkPart 25269Element 62404621 spare in the box×2
Dark Red
3 pieces
Brick Round 1 x 1 Open StudDark RedPart 3062bElement 4539099 or 4183880×3
Dark Brown
2 pieces
Plate 2 x 3 with 1 x 1 CutoutDark BrownPart 73831Element 6336664×2
Magenta
2 pieces
Brick Special 1 x 2 x 2/3 with Studs on SidesMagentaPart 4595Element 6681662 or 6322832×2
[No Color/Any Color]
2 pieces
Sticker Sheet 1 for Set 10300-1[No Color/Any Color]Part 81859Element 6369115×1
Sticker Sheet 2 for Set 10300-1[No Color/Any Color]Part 10069221Element 6313735×1
Bright Light Orange
1 piece
Tile Special Round 1 x 1 with Hollow BarBright Light OrangePart 20482Element 62237191 spare in the box×1
Pearl Gold
1 piece
Brick Round 1 x 1 Open StudPearl GoldPart 3062bElement 6060800×1
Minifigures
2 figures
Marty McFly, Printed LegsMinifigure, checked as a whole figure×1
Doc Brown - Yellow SuitMinifigure, 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.
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.