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.
Insect, Spider with Elongated Tail SectionMedium NougatPart 29111Element 6234805×1
Bricks Round and Cones
6 pieces
Cone 1 x 1 [Top Groove]Dark GreenPart 59900Element 6411591×6
Animal / Creature Body Parts
5 pieces
Creature Body Part, Dragon Wing 8 x 10 [Plain]BlackPart 55706Element 6433446 or 6270056×2
Animal Body Part, Dog Bone [Short]WhitePart 93160Element 6360202 or 46002941 spare in the box×3
Bars, Ladders and Fences
5 pieces
Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]OrangePart 3484Element 6439042×3
Bar 2L with TowballOrangePart 22484Element 6474196 or 6373074×2
Tiles
4 pieces
Tile 1 x 2 with GrooveOrangePart 3069bElement 4188771×2
Tile 1 x 1 with GrooveWhitePart 3070bElement 6550138 or 3070011 spare in the box×2
Tiles Special
4 pieces
Tile 1 x 2 with Stud Notch LeftDark BluePart 5091Element 6510132 or 6485269×1
Tile 1 x 2 with Stud Notch RightDark BluePart 5092Element 6510146 or 6485271×1
Tile Special 2 x 2 Corner with Cut Corner - FacetDark BluePart 27263Element 6166854×2
Animal / Creature Accessories
2 pieces
Insect Accessory, Spider Web, HangingWhitePart 90981Element 6549520 or 6006221×2
Bricks Wedged
2 pieces
Brick Wedged, Curved 2 x 1 with Stud Notch LeftDark BluePart 29120Element 6214811×1
Brick Wedged, Curved 2 x 1 with Stud Notch RightDark BluePart 29119Element 6214812×1
Technic Pins
2 pieces
Technic Pin 1/2 without Friction RidgesLight Bluish GrayPart 4274Element 4274194 or 42114831 spare in the box×2
Bricks Sloped
1 piece
Brick Sloped 30° 1 x 2 x 2/3Dark PurplePart 85984Element 4566607×1
String, Bands and Reels
1 piece
String with End Studs 11L OverallBlackPart 14226c11Element 6096955 or 60375581 spare in the box×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.