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.
Window 1 x 2 x 3 Flat FrontBlackPart 60593Element 6468344 or 4536522×1
Window Frame 1 x 3 x 3Light Bluish GrayPart 51239Element 6381253×1
Glass For Frame 1 x 3 x 3Trans-ClearPart 51266Element 6581839 or 6278710×1
Glass for Window 1 x 2 x 3 Flat FrontTrans-ClearPart 60602Element 6581359 or 6252258×2
Animal / Creature Body Parts
4 pieces
Creature Body Part, Horn (Unicorn)Sand GreenPart 89522Element 6223215 or 60709051 spare in the box×4
String, Bands and Reels
4 pieces
Rubber Belt Small [15mm ID] [Round Cross Section]WhitePart 85543Element 6699001 or 4580665×4
Pneumatics
3 pieces
Pneumatic T-Piece (T Bar) [New Style]BlackPart 4697bElement 61042091 spare in the box×1
Pneumatic Hose Connector with Axle ConnectorDark Bluish GrayPart 99021Element 6265669 or 6020189×2
Stickers
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
Electronics
1 piece
Light Brick 2 x 3 x 1 1/3 with Dark Bluish Gray Base [Yellow LED]Trans-ClearPart 62930Element 6555880 or 6429472×1
Large Buildable Figures
1 piece
Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle HolesBlackPart 98585Element 6186133 or 6156897×1
Minifig Lower Body
1 piece
Leg SkeletonRedPart 6266Element 6391121 or 6160091×1
Minifig Shields, Weapons, & Tools
1 piece
Tool Grappling Hook with 90° ShaftFlat SilverPart 15534Element 6391135×1
Minifig Upper Body
1 piece
Arm Mechanical with 2 Clips [Battle Droid]BlackPart 30377Element 6330086 or 42232471 spare in the box×1
Plants & Trees
1 piece
Plant, BananaYellowPart 33085Element 4114584×1
Tools
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Windscreens and Fuselage
1 piece
Windscreen 1 x 14 x 6 TaperedTrans-ClearPart 80573Element 6661191 or 6527057×1
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.